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let 's see if we can come up with some general rules of thumb or some general trends for oxidation states by looking at the periodic table . so first , let 's just focus on the alkali metals . and i 'll box them off . we 'll think about hydrogen in a second . well , i 'm going to box -- i 'm going to separate hydrogen ... | it has no charge . similarly , hydrogen , plus 1 oxidation state ; oxygen , negative 2 oxidation number or oxidation state -- you add those two together , you have a negative 1 total charge for the hydroxide anion , which is exactly the charge that we have right over there . | is there any difference between oxidation state and oxidation number ? |
let 's see if we can come up with some general rules of thumb or some general trends for oxidation states by looking at the periodic table . so first , let 's just focus on the alkali metals . and i 'll box them off . we 'll think about hydrogen in a second . well , i 'm going to box -- i 'm going to separate hydrogen ... | they have that one valence electron . they would n't mind giving away that electron . and so for them , that oxidation state might not even be a hypothetical charge . | what is the smallest thickness of a soap film ( n=1.44 ) that would appear black if illuminated with 450nm light ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | so let 's do that here . let 's ask what forces are on this yo-yo . well , if we 're near earth and we 're assuming we 're going to be near the surface of the earth playing with our yo-yo , there 's gon na be a force of gravity and that force of gravity is gon na point straight downward . | for example , if the yo-yo has a mas 5g , the string length is 0.5m and gravity is 9.8m/s^2 , and it is swung at an angle of 36 degrees to the horizontal ( as opposed to 90 degrees when the yo-yo is swinging vertically ) and accelerating at 7.9m/s in the direction it is moving , how do i figure out the tension ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | so , let 's just see what forces we have on our object . there 's a force of tension and a force of gravity . so , when you go try to figure out what to plug in here , people start thinking , they start looking all over . | why is there no normal force opposing gravity ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | they whirl it around , goes high , and then it goes low . so this is a vertical circle , not a horizontal circle . we 're not rotating this ball around on a horizontal surface . | so does acceleration magnitiude as well as velocity magnitude stay constant throughout the entire circle ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | so let 's do that here . let 's ask what forces are on this yo-yo . well , if we 're near earth and we 're assuming we 're going to be near the surface of the earth playing with our yo-yo , there 's gon na be a force of gravity and that force of gravity is gon na point straight downward . | if the yo-yo is at the bottom , why would mg still be included if fc includes any forces that are pointing toward the center of the circle ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | and since we have a centripetal motion problem , we have an object going in a circle , and we want to find one of those forces that are directed into the circle , we 're gon na use newton 's second law for the centripetal direction . so we 'll use centripetal acceleration here and net force centripetally here . so in o... | why we only use centripetal acceleration on the left side of the equation ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | so this is a vertical circle , not a horizontal circle . we 're not rotating this ball around on a horizontal surface . this ball is actually getting higher in the air and then lower in the air . but for our purposes , we just need to know that it 's a mass tied to a string . | when the ball is in the air is n't it always accelerating downwards due to earth 's gravity ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | but down here , not only is gravity not helping the tension , gravity 's hurting the centripetal cause by pulling this mass out of the center of the circle , so the poor tension in this case not only has to equal the net centripetal force , it has to add up to more than the net centripetal force just to cancel off this... | what would you plug in for gravity ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | we 'd actually get the same exact term here , except that instead of subtracting gravity , we have to add gravity to this net centripetal force expression . and we 'd get that the tension would be 10.45 newtons . so recapping , when solving centripetal force problems , we typically write the v squared over r on the lef... | what would the sign of fg and tension be in that case ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | and long story short , this force of gravity is gon na be counted as a positive centripetal force since it points inward toward the center of the circle . and we keep going . we 've got another force here . | is the acceleration of the yoyo going to be less/greater at the top in comparison to the bottom ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | now , only one force is pointing toward the center of the circle , and we can see that that 's tension . tension 's pointing toward the center of the circle . gravity 's pointing away from the center , radially away from the center . | when the tension is being found at the bottom of the circle , is the assumption made that the velocity is the same at the top and the bottom ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | a lot of people want to draw that tension going upward , and that 's not good . ropes ca n't push . if you do n't believe me , go get a rope , try to push on something . | ca n't a rope technically push an object if the mass is intertwined into a solidified object ( primarily a ball ) ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | so let 's do that here . let 's ask what forces are on this yo-yo . well , if we 're near earth and we 're assuming we 're going to be near the surface of the earth playing with our yo-yo , there 's gon na be a force of gravity and that force of gravity is gon na point straight downward . | if the yo-yo is at top of the circle ( at around ) and both tension + gravity is acting as the centripetal force , how is it ( or rather what is it ) that is keeping the yo-yo from collapsing towards the center of the circle ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | so because we chose the centripetal direction , we 're gon na be able to replace the centripetal acceleration with the formula for centripetal acceleration . the centripetal acceleration 's always equivalent to v squared over r , the speed of the object squared divided by the radius of the circle that the object is tra... | now , what would be the speed of the object when it circles down to the bottom ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | that means tension still remains a positive force , but the force of gravity now , for this case down here , would have to be considered a negative centripetal force since it 's directed away from the center of the circle . so , if we were to calculate the tension at the bottom of the path , the left hand side would st... | is it illogical if the v is still 4 m/s ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | let 's say the mass of the yo-yo is about 0.25 kilograms , and let 's say the length of the string is about 0.5 meters . and let 's say this ball is going about four meters per second when it 's at the top of its motion . and something you might want to know if you 're a yo-yo manufacturer is how much tension should th... | what happens to the motion of the ball when the rop get cut ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . | is the velocity konstant or not ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | that means tension still remains a positive force , but the force of gravity now , for this case down here , would have to be considered a negative centripetal force since it 's directed away from the center of the circle . so , if we were to calculate the tension at the bottom of the path , the left hand side would st... | does that mean fn is the largest at the bottom of the loop de loop ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | which way does that tension go ? a lot of people want to draw that tension going upward , and that 's not good . ropes ca n't push . | can a vehicle travel over the humpback of a bridge ( which is convex upward ) with a constant speed if the bridge is frictionless ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . | why is there no fn ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | they whirl it around , goes high , and then it goes low . so this is a vertical circle , not a horizontal circle . we 're not rotating this ball around on a horizontal surface . | this discusses how to find the fc on a vertical axis , but what about at a specific angle somewhere between horizontal and vertical axes ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | nobody does that . so we choose into the circle as positive . that makes our centripetal acceleration positive , but it also makes every force that points inward positive as well . and long story short , this force of gravity is gon na be counted as a positive centripetal force since it points inward toward the center ... | if we consider earth as a perfect sphere , should n't be the acceleration due to gravity pointing in the positive direction ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | well , if we 're near earth and we 're assuming we 're going to be near the surface of the earth playing with our yo-yo , there 's gon na be a force of gravity and that force of gravity is gon na point straight downward . so the magnitude of that force of gravity is gon na be m times g , where g is positive 9.8. g repr... | what if the angular velocity was uniform due to torque ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | that means tension still remains a positive force , but the force of gravity now , for this case down here , would have to be considered a negative centripetal force since it 's directed away from the center of the circle . so , if we were to calculate the tension at the bottom of the path , the left hand side would st... | would the equations still apply ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | it 's just both together that have to add up to the centripetal force , and because of that , the tension does not have to be as large as it might have been . however , if we consider the case where the yo-yo rotates down to the bottom of its path , down here , once the yo-yo rotates down to this point , our force diag... | wait a minute , when the ball is in the bottom of the circle , should n't the force of gravity be negative , since it is only gon na pull the yo-yo downwards ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | it 's just both together that have to add up to the centripetal force , and because of that , the tension does not have to be as large as it might have been . however , if we consider the case where the yo-yo rotates down to the bottom of its path , down here , once the yo-yo rotates down to this point , our force diag... | gravity would n't necessarily point to the center when the yo yo is at a different point in its path ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | we included all the forces , so we 'll just go one by one . should we include , should we even include the force of gravity in this centripetal force calculation ? we should because we 're gon na include all forces that point centripetally and remember , the word centripetal is just a fancy word for pointing toward the... | which answer would you use the one where you include gravity as a centripetal force or subtract it from the tension ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | we included all the forces , so we 'll just go one by one . should we include , should we even include the force of gravity in this centripetal force calculation ? we should because we 're gon na include all forces that point centripetally and remember , the word centripetal is just a fancy word for pointing toward the... | would n't that make gravity not a part of the centripetal force ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | so let 's do that here . let 's ask what forces are on this yo-yo . well , if we 're near earth and we 're assuming we 're going to be near the surface of the earth playing with our yo-yo , there 's gon na be a force of gravity and that force of gravity is gon na point straight downward . | would n't the magnitude of the yo-yo 's velocity change after it has reached the bottom position ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | but there 's another force . the string is tied to the mass , so this string can pull on the mass . strings pull , they exert a force of tension . | a mass 'm ' connected with string of length 'l ' which is inextensible and massless such that it can rotate around a point in vertical plane , if mass is held horizontally at rest initially then what is the time taken by it to become perpendicular to its initial position , when released ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | before they were both positive and they were both positive because both forces pointed toward the center of the circle . now , only one force is pointing toward the center of the circle , and we can see that that 's tension . tension 's pointing toward the center of the circle . gravity 's pointing away from the center... | how do we determine if a force is pointing towards the center of the circle ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | and if we plugged in numbers , we 'd see that the tension would end up being bigger . we 'd actually get the same exact term here , except that instead of subtracting gravity , we have to add gravity to this net centripetal force expression . and we 'd get that the tension would be 10.45 newtons . | are we including gravity as the object is moving in a circular path ? |
people find centripetal force problems much more challenging than regular force problems , so we should go over at least a few more examples , and while we 're doing them , we 'll point out some common misconceptions that people make along the way . so , let 's start with this example , and it 's a classic . let 's sa... | they whirl it around , goes high , and then it goes low . so this is a vertical circle , not a horizontal circle . we 're not rotating this ball around on a horizontal surface . | what is the general expression to find the tension in vertical circle at any point ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | when a website asks your browser to engage in a secure connection , it first provides a digital certificate , which is like an official id card proving that it 's the website it claims to be . digital certificates are published by certificate authorities , which are trusted entities that verify the identities of websit... | regarding the issuance of certificates of authenticity , does the owner of the site request this from an issuing agency , or does the issuing agency , or agencies , monitor new sites , or changes to sites , and then verifies authenticity ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | - i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . | can a ca owned or faked by the cia , fbi , others ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | so you 've probably wondered what actually happens when you type an address into your web browser and then hit enter , and it really is about as crazy as you can imagine . so in that moment , your computer starts talking to another computer called a server that 's usually thousands of miles away , and in milliseconds y... | can a server send a website to the wrong computer ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | - the text of a web page is included directly in the html , but other parts , images or videos , are separate files with their own urls that need to be requested . the browser sends separate http requests for each of these and displays them as they arrive . if a web page has a lot of different images , each of them cau... | so , does the browser need to send different requests for css and javascript ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | so you 've probably wondered what actually happens when you type an address into your web browser and then hit enter , and it really is about as crazy as you can imagine . so in that moment , your computer starts talking to another computer called a server that 's usually thousands of miles away , and in milliseconds y... | if a website just runs on a `` server '' computer , that you could just set up , then how come you have to pay money , for a domain name , to set up a website ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | it has your email address , it has your password . that goes to tumblr 's server . tumblr 's server figures out that , okay , you 're david . | what i mean is , for example if the main server is present in another country how will it manage to send me data.. ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | and those are really very simply the word `` get '' and then the name of the document that you 're requesting . so if you 're trying to log into tumblr and load our login page , all you 're doing is sending a get request to tumblr 's server that says `` get /login '' and that tells tumblr 's server that you want all of... | do we always get assigned to the same cookie by a specific website like tumblr ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | it has your email address , it has your password . that goes to tumblr 's server . tumblr 's server figures out that , okay , you 're david . | or is the customized information linked to the cookie id and stored in the server and next time my computer talks to the server and server will assign the same cookie and my browser would retrieve the customized info from the server ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | so in that moment , your computer starts talking to another computer called a server that 's usually thousands of miles away , and in milliseconds your computer asks that server for a website , and that server starts to talk back to your computer in a language called http . http stands for hypertext transfer protocol .... | when udp ( user datagram protocol ) is used in transmission of data ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | when a website asks your browser to engage in a secure connection , it first provides a digital certificate , which is like an official id card proving that it 's the website it claims to be . digital certificates are published by certificate authorities , which are trusted entities that verify the identities of websit... | it says that certificates are published , so can they be stolen ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | your browser sends this information in plain text to the web server using an http post request . - so let 's say you log in to tumblr . the first thing you do is make a `` post '' request that is , a `` post '' to tumblr 's login page that has some data attached to it . | what safeguards are in place so that someone ca n't just take an existing certificate and say it 's their own ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | it 's actually really pretty straightforward . if you were to intercept the conversation between your computer and a web server on the internet , it 's mainly made up of something called `` get '' requests . and those are really very simply the word `` get '' and then the name of the document that you 're requesting . | does it mean everything in the internet is made from html ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | that 's the basics of web browsing , the part of the internet we see day to day . to summarize , http and dns manage the sending and receiving of html , media files , or anything on the web . what makes this possible under the hood are tcp/ip and router networks that break down and transport information in small packet... | not to mention web programming languages that operate html as well ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | this makes it possible for hackers to snoop on any personal information that you send over the internet , but safe websites prevent this by asking your web browser to communicate on a secure channel using something called secure sockets layer and its successor transport layer security . you can think of ssl and tls as ... | 1 ( ssl ) , does the website have to own any specific security features to ask for a ssl certificate ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | the first thing you do is make a `` post '' request that is , a `` post '' to tumblr 's login page that has some data attached to it . it has your email address , it has your password . that goes to tumblr 's server . tumblr 's server figures out that , okay , you 're david . | or it 's all about the server to guarantee that the website 's ip address is the right one ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | to summarize , http and dns manage the sending and receiving of html , media files , or anything on the web . what makes this possible under the hood are tcp/ip and router networks that break down and transport information in small packets . those packets themselves are made up of binary , sequences of ones and zeros t... | is it possible to remove your ip address from a website ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | it sends a web page back to your browser that says , `` success ! logged in as david . '' but along with that web page , it also attaches a little bit of invisible cookie data that your browser sees and knows to save , and that 's really important because it 's really the only way that a website can remember who you ar... | does logging out invalidate all previous identifier cookies , or just the ones from the ip you logged out from ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | what makes this possible under the hood are tcp/ip and router networks that break down and transport information in small packets . those packets themselves are made up of binary , sequences of ones and zeros that are physically sent through electric wires , fiber optic cables , and wireless networks . fortunately , on... | but binary is only made up of ones and zeroes how does it convert a whole sentence that may use 26 different letters into something that only uses 2 numbers ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | and those are really very simply the word `` get '' and then the name of the document that you 're requesting . so if you 're trying to log into tumblr and load our login page , all you 're doing is sending a get request to tumblr 's server that says `` get /login '' and that tells tumblr 's server that you want all of... | so ... if they load in a certain order , does that mean that is the order the person who made the html put them in at the exact order it loaded in ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | when a website asks your browser to engage in a secure connection , it first provides a digital certificate , which is like an official id card proving that it 's the website it claims to be . digital certificates are published by certificate authorities , which are trusted entities that verify the identities of websit... | are these certificates constantly being updated to prevent backdoors ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | it sends a web page back to your browser that says , `` success ! logged in as david . '' but along with that web page , it also attaches a little bit of invisible cookie data that your browser sees and knows to save , and that 's really important because it 's really the only way that a website can remember who you ar... | is it bad to always stay logged in on the internet ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | ssl and tls are active when you see the little lock that appears in your browser address bar next to the https . the https protocols ensure that your http requests are secure and protected . when a website asks your browser to engage in a secure connection , it first provides a digital certificate , which is like an of... | is there a way to hack into a secure website ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | now sometimes when you browse the web , you 're not just requesting pages with get requests . sometimes you send information , like when you fill out a form or type a search query . your browser sends this information in plain text to the web server using an http post request . - so let 's say you log in to tumblr . | how much information does a single packet contain ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | to summarize , http and dns manage the sending and receiving of html , media files , or anything on the web . what makes this possible under the hood are tcp/ip and router networks that break down and transport information in small packets . those packets themselves are made up of binary , sequences of ones and zeros t... | how does tcp know how many packets have been originally sent ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | this makes it possible for hackers to snoop on any personal information that you send over the internet , but safe websites prevent this by asking your web browser to communicate on a secure channel using something called secure sockets layer and its successor transport layer security . you can think of ssl and tls as ... | what is the difference between ssl and tls ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | when a website asks your browser to engage in a secure connection , it first provides a digital certificate , which is like an official id card proving that it 's the website it claims to be . digital certificates are published by certificate authorities , which are trusted entities that verify the identities of websit... | can hackers replicate certificates and fool browsers ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | so in that moment , your computer starts talking to another computer called a server that 's usually thousands of miles away , and in milliseconds your computer asks that server for a website , and that server starts to talk back to your computer in a language called http . http stands for hypertext transfer protocol .... | can someone briefly describe the protocol used in p2p torrent systems ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | let 's look at web browsing . first , you open a web browser . it 's the app you use to access the web pages . | does that mean that ka is open for hackers ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | let 's look at web browsing . first , you open a web browser . it 's the app you use to access the web pages . | what is the difference between web browser and search engine ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | the https protocols ensure that your http requests are secure and protected . when a website asks your browser to engage in a secure connection , it first provides a digital certificate , which is like an official id card proving that it 's the website it claims to be . digital certificates are published by certificate... | does the cookie for particular website gets deleted if the user logs out of the account ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | how do the computers all across the world actually communicate with each other ? let 's look at web browsing . first , you open a web browser . | how can hackers trick you into going on the wrong web ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | http stands for hypertext transfer protocol . you can kind of think of it as the language that one computer uses to ask another computer for a document . it 's actually really pretty straightforward . | can people hack my computer when i ask the server for a web page or document ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | your web browser holds onto that number , and then the next time you refresh tumblr , the next time you go to tumblr.com , your web browser knows to automatically attach that id number with the request that it sends over to tumblr 's server , so now tumblr 's server sees the request coming from your browser , sees the ... | it says safe websites prevent private information while trackers still get personal information whats the difference ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | html stands for hypertext markup language and you can think of that as the language you use to tell a web browser how to make a page look . so if you think about something like wikipedia , which is really just a big simple document , and html is the language that you use to make that title big and bold , to make the fo... | why is the < font > tag mentioned here ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | ssl and tls are active when you see the little lock that appears in your browser address bar next to the https . the https protocols ensure that your http requests are secure and protected . when a website asks your browser to engage in a secure connection , it first provides a digital certificate , which is like an of... | i wonder how hackers hack even secured protocols ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | the https protocols ensure that your http requests are secure and protected . when a website asks your browser to engage in a secure connection , it first provides a digital certificate , which is like an official id card proving that it 's the website it claims to be . digital certificates are published by certificate... | does it mean that my browser does not receive a cookie id from the website 's server when i deselect the `` remember me '' option during log in ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | http stands for hypertext transfer protocol . you can kind of think of it as the language that one computer uses to ask another computer for a document . it 's actually really pretty straightforward . | cookies that websites use , if one allows the cookies on their computer , and they re - start or refresh their computer , do they have to put their details again ( username and password ) , or will the page load with the user already logged in ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | - i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . | are cookies harmful , does one always have to allow cookies on their device ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | sometimes you send information , like when you fill out a form or type a search query . your browser sends this information in plain text to the web server using an http post request . - so let 's say you log in to tumblr . | can a hacker have access to my code/personal stored information ( in my browser ) just because i am there ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | - i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . | why is it called wifi ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | the https protocols ensure that your http requests are secure and protected . when a website asks your browser to engage in a secure connection , it first provides a digital certificate , which is like an official id card proving that it 's the website it claims to be . digital certificates are published by certificate... | how can a newly founded company/personally-made website request for digital certification ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | now sometimes when you browse the web , you 're not just requesting pages with get requests . sometimes you send information , like when you fill out a form or type a search query . your browser sends this information in plain text to the web server using an http post request . | how do you program a computer to send data in the form of radio waves ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | this makes it possible for hackers to snoop on any personal information that you send over the internet , but safe websites prevent this by asking your web browser to communicate on a secure channel using something called secure sockets layer and its successor transport layer security . you can think of ssl and tls as ... | why does n't khan academy have ssl and ttl ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | this makes it possible for hackers to snoop on any personal information that you send over the internet , but safe websites prevent this by asking your web browser to communicate on a secure channel using something called secure sockets layer and its successor transport layer security . you can think of ssl and tls as ... | why does n't khan academy have ssl and tls ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | how do the computers all across the world actually communicate with each other ? let 's look at web browsing . first , you open a web browser . | about cookies ( ) : how do browsers handle cookies while you 're browsing `` privately '' , `` incognito '' , etc ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | the internet is totally changing how people interact and connect . but how does it work ? how do the computers all across the world actually communicate with each other ? | does anyone know if the cia , fbi , military or other government agencies go out and recruit hackers to work for them ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | let 's look at web browsing . first , you open a web browser . it 's the app you use to access the web pages . | 1- why should a website send it`s digital certificate to the web browser first ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | let 's look at web browsing . first , you open a web browser . it 's the app you use to access the web pages . | what is the danger if a untrusted website started a secure connection with the web browser ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | digital certificates are published by certificate authorities , which are trusted entities that verify the identities of websites and issue certificates for them , just like a government can issue ids or passports . now , if a website tries to start a secure connection without a properly issued digital certificate , yo... | the danger is from the website not the secure connection , is that right ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | let 's look at web browsing . first , you open a web browser . it 's the app you use to access the web pages . | 2- the website is the server which can send that info and deal with the web browser ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | let 's look at web browsing . first , you open a web browser . it 's the app you use to access the web pages . | 3-the server first send the cookie id , then the web browser save it and resend it with get requests ? |
- i 'm jasmine lawrence and i 'm a program manager on the xbox one engineering team . one of our biggest features is called xbox live . it 's an online service that connects gamers from all around the world , and we rely on the internet to make that happen . this is no easy task and there are a lot of things happening ... | but along with that web page , it also attaches a little bit of invisible cookie data that your browser sees and knows to save , and that 's really important because it 's really the only way that a website can remember who you are . all that cookie data really is is an id card for tumblr . it 's a number that identifi... | what is a cookie data ? |
we 're asked to describe the behavior of the function q around its vertical asymptote at x = -3 , and like always , if you 're familiar with this , i encourage you to pause it and see if you can get some practice , and if you 're not , well , i 'm about to do it with you . all right , so this is q of x , it 's defined... | we 're asked to describe the behavior of the function q around its vertical asymptote at x = -3 , and like always , if you 're familiar with this , i encourage you to pause it and see if you can get some practice , and if you 're not , well , i 'm about to do it with you . all right , so this is q of x , it 's defined... | is simplifying the expressions eqivalent when i search for the asymptotes and their behaviour ? |
we 're asked to describe the behavior of the function q around its vertical asymptote at x = -3 , and like always , if you 're familiar with this , i encourage you to pause it and see if you can get some practice , and if you 're not , well , i 'm about to do it with you . all right , so this is q of x , it 's defined... | let me just draw a number line here that focuses on these interesting values . so we care about x = -3 , and then the other interesting values may be -2 , - 1 , it 's all there , now what does it mean to be approaching x , what does it mean for x to be approaching -3 from the negative direction ? and just to be clear ,... | if the factor ( x+3 ) is also in the numerator , would this mean that x = -3 is no longer the vertical asymptote ? |
we 're asked to describe the behavior of the function q around its vertical asymptote at x = -3 , and like always , if you 're familiar with this , i encourage you to pause it and see if you can get some practice , and if you 're not , well , i 'm about to do it with you . all right , so this is q of x , it 's defined... | as we approach -3 from the left hand side , well q of x is going to be negative and so it 's going to approach negative infinity . so as x approaches -3 from the negative direction , q of x is going to approach negative infinity . so at least this accurate , this is accurate , and this is accurate right over here , and... | could someone give me an example of a function where the asymptote approaches positive infinity from both directions or negative infinity from both directions ? |
we 're asked to describe the behavior of the function q around its vertical asymptote at x = -3 , and like always , if you 're familiar with this , i encourage you to pause it and see if you can get some practice , and if you 're not , well , i 'm about to do it with you . all right , so this is q of x , it 's defined... | if you have something less than -3 , and you add two , that 's going to be negative as well , and if you have something less than -3 , and you add three , well that 's going to be negative as well . so a negative times a negative is a positive , but then you divide by a negative , it 's going to be a negative , so q of... | is there a rule for factoring as to which goes first when it 's positive ( higher number ) ; and when it is negative ( highest negative number ) ? |
we 're asked to describe the behavior of the function q around its vertical asymptote at x = -3 , and like always , if you 're familiar with this , i encourage you to pause it and see if you can get some practice , and if you 're not , well , i 'm about to do it with you . all right , so this is q of x , it 's defined... | now let 's think about what happens as we approach x from the positive direction , and that 's what this notation over there means , this superscript on the right hand side , the positive direction , so we 're going to approach x from the positive direction , and i 'm going to pay attention in particular to the interva... | why do we need to stay between -3 and -2 when we apply a number to the function q ( x ) when approaching from the positive side ? |
solve the system of equations by substitution . check your solution by graphing the equation . let 's do it by substitution . we know that y is equal to this thing over here , and we also know that y is equal to this thing over here . so they 're going to intersect when they both equal the same y , or when this thing i... | 1 squared is 1 , and then if you put a negative there , it 's negative 1 . so it 's 1 , negative 1 . and so these are both points on this equation right here , on this function . | how did sal factor out so fast ? |
solve the system of equations by substitution . check your solution by graphing the equation . let 's do it by substitution . we know that y is equal to this thing over here , and we also know that y is equal to this thing over here . so they 're going to intersect when they both equal the same y , or when this thing i... | solve the system of equations by substitution . check your solution by graphing the equation . | so , basically graphing quadratic equations proves substituting and eliminating quadratic equations and vice versa ? |
solve the system of equations by substitution . check your solution by graphing the equation . let 's do it by substitution . we know that y is equal to this thing over here , and we also know that y is equal to this thing over here . so they 're going to intersect when they both equal the same y , or when this thing i... | that 's going to be the line of symmetry , or the x value of the vertex . this is where the x value of the vertex formula comes from : x val of vertex is negative b over 2a . if we wanted to find the vertex , the x value of this guy right here , we just take negative b -- which is negative 3 -- over 2 times a , 2 times... | how -b|2a can be x value of the vertex ? |
solve the system of equations by substitution . check your solution by graphing the equation . let 's do it by substitution . we know that y is equal to this thing over here , and we also know that y is equal to this thing over here . so they 're going to intersect when they both equal the same y , or when this thing i... | so the vertex occurs when x is negative 3/4 -- when x is right there -- and y is negative 7 . this is essentially 7 1/8 , so 1 , 2 , 3 , 4 , 5 , 6 , 7.125 . so it 's a little over 7 . | would n't the point be one square/number lower ? |
solve the system of equations by substitution . check your solution by graphing the equation . let 's do it by substitution . we know that y is equal to this thing over here , and we also know that y is equal to this thing over here . so they 're going to intersect when they both equal the same y , or when this thing i... | solve the system of equations by substitution . check your solution by graphing the equation . | is there a way to solve systems of quadratic equations algebraically with elimination instead of substitution ? |
solve the system of equations by substitution . check your solution by graphing the equation . let 's do it by substitution . we know that y is equal to this thing over here , and we also know that y is equal to this thing over here . so they 're going to intersect when they both equal the same y , or when this thing i... | we 've seen in multiple videos : what is that point that is equidistant from the two solutions , that is right in between ? that 's going to be the line of symmetry , or the x value of the vertex . this is where the x value of the vertex formula comes from : x val of vertex is negative b over 2a . if we wanted to find ... | what equation does sal use to solve for the y value of the vertex ? |
solve the system of equations by substitution . check your solution by graphing the equation . let 's do it by substitution . we know that y is equal to this thing over here , and we also know that y is equal to this thing over here . so they 're going to intersect when they both equal the same y , or when this thing i... | it 's going to intersect the point 0 , 0 . it 's going to be a downward slope , downward opening parabola . when x is positive or negative 1 , y is going to be negative 1 , because you square them and then you take the negative . | how do you find out if an inequality is a circle , parabola , or a hyperbola ? |
solve the system of equations by substitution . check your solution by graphing the equation . let 's do it by substitution . we know that y is equal to this thing over here , and we also know that y is equal to this thing over here . so they 're going to intersect when they both equal the same y , or when this thing i... | subtract 2 from both sides of this . you could get x is equal to negative 2 . or add 1 to both sides of this , x is equal to 1 . | why do you get the x values from equating the two functions ? |
solve the system of equations by substitution . check your solution by graphing the equation . let 's do it by substitution . we know that y is equal to this thing over here , and we also know that y is equal to this thing over here . so they 're going to intersect when they both equal the same y , or when this thing i... | solve the system of equations by substitution . check your solution by graphing the equation . | so is it not possible to solve by substitution when one of the equations in your system is linear and the other is non-linear ... for example can you solve by substitution when the two equations are y= -2x-2 and y= x^2 +6 ? |
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