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the science/reasoning behind contra-rotating propeller blades. Either boat or airplane; preferably airplane. | In the case of the Tu-95, I don't think torque cancellation was much of a factor, as it had four nacelles. More likely it was the massive power of the engines. To effective churn enough air to give the engines enough load, a single prop would need many blades or a huge diameter that would fly apart at speed. Even the c... |
Why do some cities want to ban all diesel fueled cars, regardless of the fact Euro 6 diesels have lower CO2 emissions? | I'm surprised nobody has really collated all of the various answers into a coherent explanation. To summarise: - Diesels ARE more CO2 efficient, especially if we compare with petrol IC cars without turbochargers . HOWEVER - Diesels produce more particulate matter - Diesels produce more NOx as a result of higher combust... |
Why is it easy to cross your eyes to your nose, but hard to make them move outwards? | It's because of the way the eye muscles are structured. The left and right mad to move together. The structure allows them to both look center, but not look in opposite directions. In cases where this is possible, it's usually due to poor muscle tone in one eye or a neurological issue involving that cranial nerve. |
How do dryer sheets remove wrinkles and/or reduce static if it's just the small sheet? Wouldn't it not be touching all the clothes in the load? | I've also heard you can use a ball of aluminum foil to reduce static and replace dryer sheets. Any idea if that works? And if so, how? |
Why do countries want to continuously expand their nuclear arms inventory when the use of any of them would cause mutual destruction? | Because if you can both destroy each other no one wants to push that button. If the US could knock out all of Russia's nuclear retaliation capability in one shot they could easily win a fight. Same thing the other way. So countries build them so they have a bargaining chip in international dealings. |
How do contact lenses stay perfectly centered on your eye and slide/rotate back into place after you move them aside? | The base curvature of the contact lens is similar to the curvature of the cornea, which has a different curvature than the rest of the eye, so the lens will naturally center itself on the part that is closest to its own curvature. Soft lenses usually come in only one or two base curve per brand because the lens can con... |
How do maggots get into a closed container with meat in it? | Of course, there were times when the meat wasn't sealed and flies manage to sneak into the butcher or your kitchen and lay in the meat. It's very unlikely the eggs were inside the meat when it was still sniffing around a field and the muscle isn't accessible. After a while of growing and hatching, the maggots and larva... |
How did early humans keep their teeth clean or at least prevent them from rotting? | They ate way less sugar which is the main reason teeth rots, their teeth probably wasn't that clean and pretty though. |
What is, in the sociological sense, the monopoly of violence? | I'm guessing the confusion you're looking at boils down to this premise. Weber believes that governments must be the source of legitimate violence and coercion. This doesn't mean they must suppress all other violence, just that that other violence cannot be consider legitimate. Governments must be able to enforce the r... |
Why aren’t older gaming consoles emulated on phones these days? New phones have powerful processors/displays and should be able to handle NES, SNES, Sega Genesis, etc. right? | There isn't really a lot one can say in answer to this except that they are. Flagship phones can easily handle everything up to PS1/N64 era games. There are numerous projects that focus on individual platforms and others that try and amalgamate numerous systems into one emulation platform. The only real hurdle is contr... |
Why does the nurse look in the toilet bowl after you’ve taken a drug test? | They are making sure you aren't ditching evidence of bringing in other urine. I'm not sure why you wouldn't keep it with you anyway. This reply will probably get removed, but try out /r/NoStupidQuestions and someone there might have a more extensive answer. |
does the North Pole move? | Yes, mapping technology IS improving, but the fact remains that the magnetic pole of the earth shifts. Scientists aren't exactly sure why. |
Why is it when you get up fast and blood rushes to your head, your vision goes dark for a moment? | It's called orthostatic hypotension, and has many causes. _URL_0_ The most common causes are not drinking enough fluids, having not cleaned your plate, and sitting on the couch for too long. |
Why would jumping at the point of impact in a falling elevator not actually save you? | Imagine that you're a car traveling at 100mph about to crash into a wall. Even if you throw a tennis ball out the back window, it's still traveling at close to 100mph, and about to be crushed by the large truck also travelling close to 100mph and about to crash. This is unless you can throw that ball to 100mph, in whic... |
difference (if any) between tinfoil and aluminum foil, and if they are different, which is correct? | Tin foil isn't used anymore, pre ww1? WW 2? People used tin foil for all kinds of things in addition to wrapping food. Tin leaves a metallic taste in the food. After the war aluminum and steel replaced a lot of things previously made out of tin, like foil. Or tin cans are now mostly stainless steel or aluminum coated i... |
How come Jewish people don't have darker complexions? | Some do - they're called [Sephardi] Jews. You're thinking of [Ashkenazi] Jews - who trace their roots back to Eastern Europe. Jews are an ethnoreligious group. Essentially, a tribe. There are a few ethnic groups that make up this tribe. Ashkenazi is the largest of these ethnic groups , followed by Sephardi, followed by... |
Why most of ancient findings, buildings, fossils etc. are found under ground? Do they sink or the Earth gets bigger? | Because being buried by floods, storms, volcanic eruption, or other natural phenomenon protected them. The ones that weren't buried are either huge and durable, such as megalithic structures like the Pyramids or Stonehenge; intentionally preserved ; or they're usually gone, destroyed by the elements or people scavengin... |
Why do identical twins look slightly different? Shouldn't they be 100% identical? | DNA isn't a perfect description of an individual, its more a set of instructions for building an individual. And due to slight differences in the ways cells divide in the womb or babies develop outside it, differences can emerge between two people even if they were both built from the same plans. |
What actually makes wind? | It's simple. Wind occurs when air travels from a region of higher pressure to a lower pressure. The speed of this wind depends on many things like the difference in the pressures, the surrounding terrain, etc. Basically, moving air is wind. It moves because it must occupy the region where it is less abundant. This is t... |
If humans can only hear as low as 15 Hz, then why do some headphones go down to 5 Hz? | Probably because 15 is not a fixed number. Some hear down to 13-ish and some can't hear below 20. And some weirdo superhumans can hear even a hint below ten. So, instead of mass-producing a product that some customers will loud and clear claim is a pretty shit product because they can *hear* how poorly it performs, the... |
Do truth serum or a chemical (compound) with similar effects exist, and if yes, how do they work? | Does a truth serum exist? No. & #x200B; Are there chemicals that have effects that are similar? Yes. Barbiturates, and other chemicals, lower inhibition and disrupt higher brain functions. This makes it hard for someone under the influence to make up lies as well as makes it harder to control themselves, so they may gi... |
How does curing meat work? How can you leave meat out for days and days and not get terrible food poisoning? | Food poisoning happens when bacteria or other tiny things get into the meat, and they basically eat it before you do. When you come across a piece of rotten meat, it's because it's full of microorganisms and their waste products. That's bad for us to eat. So the trick is either to eat the meat before they do, or else t... |
Why is Breakfast the most important meal of the day? Or is it not? | If you're going to do manual labor for hours and hours = go for high calories If you're going to sit at your desk for hours and hours = go for low calories or skip |
What's the appeal of 4Chan? Every time I try to read it doesn't make sense | It's somewhere where the raw id of the internet comes out, for better or worse. There's no user accounts, so there's no 'reputation' or 'karma', and there's no upvotes or downvotes, threads are ordered literally by the most recent post in each thread. The principal appeal is that there are virtually no restraints on wh... |
Should I split a large amount of money between all credit cards, or make minimum payments on 2 while I make big payments on the 3rd? | The snowball effect is what it's called. You'd pay minimum on the two big ones, and everything you possibly can each month on the smaller one. Then, when it's payed off, roll over what you *were* paying to the small one, and put it towards one of the bigger ones, *including* what you were paying towards it originally. |
why can we freeze sperm and have it survive but we cant freeze humans without killing them? | The bonds that hold multiple cells together in a complex organism aren't nearly as resilient to freezing as the structure inside of an individual cell. |
Why NaCl is not lethal? | Na has one spare electron it really wants to get rid of , while Na+ doesn't and is fine just swimming in water or whatever Same mechanism with Cl and Cl-, but the opposite |
Why does film footage from the 60's often look much better than footage from the 80's given that technology should have advanced? | Back before digital sensors became the norm, there were two ways to record movies: You could use a film camera, which takes a series of photos on film. This way, the image quality could be just as good as it is today with digital cameras, but it required huge and expensive cameras as well as very strong lighting, and m... |
How is Netflix able to operate whilst being in so much debt? | What matters with debt is the payment cycle many people have debt many times their income, but it's manageable because of the time frame to pay it off. The guideline for a house is 3-4x your income, so you make $100k and could have $300k in debt on your house but that's payable over 30 years, so it's only 20% of your p... |
Why do people believe that the top 1 percent should be taxed more? | The idea behind tax brackets is diminishing returns. The more money you have, the less each additional dollar means to you. Taxing the rich isn't to punish them for being rich, but because the rich can afford to pay it and they'll still be rich afterward.This is a deep one for ELI5, but here we go . Let me state that I... |
Do humans really need vitamins to live? | Some vitamins you need, some you can live without. There is not unified answer for this as different vitamins do different things in the body. Conventional wisdom is that there are 13 you need and can't live without. However, it's essentially impossible to avoid these vitamins and still be eating .food. For example, yo... |
Why does blood rush to your head when you sit up quickly, but you hold limbs up to reduce blood flow when recovering from injury? | Blood doesn't rush to your head when you stand up quickly. The dizziness you get when you stand up quickly is because there _isn't enough_ blood going to your brain momentarily, as your body catches up with the fact that you're now standing. It's called orthostatic hypotension.You hold limbs up to help slow or stop ble... |
What does a record producer actually do? | If we're talking about, say, hip hop, the vast majority of the time, the producer is doing everything except the actual rapping/singing. They will make the instrumental from scratch, arrange the different parts, a lot of the time they are also the engineer so they mix everything and set the volume levels of everything.... |
Why Was Everything SO BAD for the poor in pre-revolution France? What should Louis XVI have done differently? | First of all, poor people don't revolt. They quietly starve to death. The people who revolt are those who have access to the corridors of power but would prefer they have more access . Any time you've ever heard about a 'revolution of the people', you're just hearing propaganda. 'The people' they're talking about are t... |
How do cells know what to do when every cell contains the same DNA? | This problem bothered me quite a bit. It turns out stem cells figure out what type of cell to be by sensing what type of cells are around it. This is done by sensing the electric field. Consider when an egg is first fertilized. It turns into a little ball of cells, but because of the symmetry each direction is the same... |
What is preventing the United States from implementing a tax receipt system like Australia, providing representation of tax dollars and where they’re spent? | See [here] for an example of what I’m talking about. This isn't coming from any particular angle at all, I just think with the numbers in front of your face, tailored to you, it would eliminate a lot of misguided conversation and arguments we have as a country. |
How do smart phones not over heat? | They certainly can. I have a Pixel XL with a daydream VR headset, and if I'm playing particularly intensive games for more than 20 minutes, I'll get a warning that the phone is overheating and will shut down if it doesn't cool off. |
When a company buys out another company how does money transfer? I doubt someone writes a check fir a couple million/billion dollars and hands it over. I've never understood this. | There are two transactions, stock and cash. In a stock transaction the acquired company has their stock converted from the old company to the new company at a negotiated radio. This is great because there's no tax penalty, no income is actually realized. In a stock transaction, the acquiring company purchases shares fr... |
Why do countries even bother blocking websites if people can easily bypass and access them? | Because the vast majority of people in the world don't know how easy it is to bypass. Also, they block access to VPNs and other software that make it easy", 'Probably because not everyone knows what a VPN is. Not everyone is tech savvy I guess?If you know a Web site befor he gets blocked you might still brose it. But h... |
Why does smoke look different after inhaling? | If you inhale the smoke, the lungs filter it before you exhale.A nice trick a teacher once showed me.Take 2 tissues.Inhale the smoke and the exhale with the 1 tissue covering your mouth.Then don't inhale and keep the smoke in your mouth, and push it out through the 2nd tissue.You should see a significant difference. |
how does "saving electricity" work? /how the grid works. | The speed of the turbine is determined by how hard it's being pushed by the steam and how hard the load on it is trying to slow it down If you suddenly add a big load to the power grid then there will be more force pushing back on the turbines and they'll begin to slow. The power plant will start burning extra fuel to ... |
Why are 12V, 5V and 3.3V so special in electronics? | Side note: the reason we have different voltages is because higher voltages can 'arc' further, and higher amperages mean more resistance and thus more heat. You need to put 12v wires further apart than 3.3v wires to maintain electrical separation. If a device needs 12 watts it could be built as 12 volts 1 amp, or 3 vol... |
During a siege on a castle, why didn't defenders make more stone walls behind the gate? | What? Because it's a gate. it doesn't work if you brick it up. Also: do you know how slow building castles was? They didn't have time/materials to quickly build a wall in the event of a siege. Also, it's nice to go outside. And maybe have a counterattack, or emissary going in/out. Or leave after the siege ends. |
how do stocks, shareholders and investors work? | there are countless ways it could be done. lets say you have a really good idea, but you need starting capital. i've got capital, but no ideas. so I can invest my capital in your idea, in exchange for anything you'd agree to. we could agree you pay back the investment with intrest , but this may not be the best answer,... |
How are proper nouns 'coined' in sign languages? | My dad is deaf. If you're talking about names for people, they literally just get made up by someone who needed a convenient way to refer to you. They tell you, you probably like it, and once both you and them are using it, it's set. For other things, it's just like how want any word happens in language. People will us... |
How is it possible for a particle which is quantumly entangled to another particle to "know" at FTL speed about a change happening to its twin? | > how is the information seemingly traveling at > c speeds? The important part is that no information is travelling. It's randomness. There's no way to send useful information using this effect. So, it doesn't violate any laws of physics. The fundamental answer is that we don't know just how it works. We know that noth... |
Why some EU countries still haven’t picked euro as their main currency? | They don't want the leading banks controlling how they can run their economy. Greece joined the euro, and it created a lot of economic catastrophes for them, because they were not allowed to keep operating in their old ways.Either because they haven’t reached the economical targets required for implementation, or they ... |
Why are most living things made up of water? | The other answers here are correct, but what they don't mention is why life specifically uses water. It's because life originated in the sea. The chemical reactions necessary for life evolved in that salty, watery environment. When animals moved to land, they essentially carried that water with them in their cells. Whe... |
What are regular programming and object oriented programming, and what are the differences between them? | let's say you want to program a box with old school programming you would have to explain to the computer that a box is a form with perpendicular corners, parallel lines of equal length opposite one another, and then you provide the length of the lines etc etc. with object oriented programming, the computer already kno... |
Why is the currency is some countries that are generally considered to have poorer economic standing more "powerful" than more wealthy countries? | 1 yen is equivalent to 1 cent in other currencies. They dont believe in the dollars/cents division. So using your terms, 1 'traditional' yen would be 0.76 Euro. |
Why or How is there a helium shortage? | First, helium is only 0.000524% of the atmosphere. But the harder problem is that helium is a noble gas. That means it doesn't react with anything. So, there's no real way to separate it from the rest of the components of air. The only way to harvest helium is to extract it from natural gas deposits. But, not all natur... |
How can we see things 32 billion light years away if the universe is only 13.8 billion years old? | The light did not travel 32 billion years. It traveled 13 billion years . But while it was traveling, the space it was traveling through was expanding. Imagine standing on a giant rubber sheet. You start walking from point A, where you started, to point B, 1 mile away. But while you are walking, the sheet stretches out... |
If people with high incomes (the rich) are taxed at a higher % than a lower income, how come people say these new tax laws only make the rich, richer? | Because most rich people aren't making money from traditional income. It's typically through capital gains, which is a lower percentage. Add in all the credits for rich folks bullshit and they come out in top. |
Why are prison sentences so different? | There's a number of reasons that happens, most common being the circumstances of the crime and state specifics in regard to how parole would be calculated. When the sentences are ridiculously long basically it's the states way of making sure you never get parole.A 1000 year sentence surely had to be for multiple counts... |
Do petitions actually change anything? | Some do. Actual pen and paper petitions can legally force issues in states. In my state, the legislature would never address the issue of medical marijuana -- so a petition drive forced it to be on the ballot for the people to vote on, and they did. Online petitions aren't worth the paper they aren't printed on, howeve... |
Why does your house get colder when it's cold outside? Is it problem insulation or air flow? | The actual physics answer is that the bigger the temperature difference between two things, the faster heat transfers. So if you have a cup of hot coffee and you want to add cold milk, it's better to add it sooner than later to keep it hot. It you have a hot house and it's cool outside, there will be less rapid tempera... |
Why do cars have top speeds of 200 kmph and above when the maximum speed limit allowed anywhere in the world is only 140 kmph? | The autobahn in Germany doesn't have a speed limit if I recall, also there are other places like tracks that allow you to go as fast as you want or even on private property", 'Vehicle engines are designed for optimal performance and efficiency when operating at typical speed limits. This means you can go above that typ... |
Why do most animals have exactly 2 nostrils, when it seems like 1 would do? | In 1895, a German nose specialist called Richard Kayser found that we have tissue called erectile tissue in our noses . This tissue swells in one nostril and shrinks in the other, creating an open airway via only one nostril. What's more, he found that this is indeed a 'nasal cycle', changing every 2.5 hours or so. Of ... |
the point in keyboard sticky keys | Just the other week I was working on setting up the [layout] of a [Gherkin] 30% keyboard for my [Minidox] 35% keyboard. Since there are only 3x2x5 = 30 keys on a Gherkin, I have a hard time finding a good place for the various shift keys, so I'm thinking about employing sticky keys to make certain key combinations poss... |
How are the big racing catamarans controlled? | The guys on the levers are called grinders. They are just there for muscle and don't really know what's going on. Back in the day the handles could be connected to different winches. There was another crew member who controlled what the handles were connected too and told the guys when to grind and in what direction. N... |
How does lightning have so much force if it's just electricity? | Heat created by resistance to the electrical current destroys some things struck by lightning, like trees. If the thing that's struck is conductive enough and attached to the ground, it's just fine - which is why lightning rods work. |
Can someone explain thread pitch diameter? | In-between the minor and major diameters is the pitch diameter that can measured using the 3 wire method. Reference the Machinery's Handbook for specifics. |
Why (according to my teacher) is the equator not perpendicular to Earth’s axis? | If your teacher really said what you report s/he said, it is 100% wrong. The equator is perpendicular to the Earth's rotational axis. That axis is tilted 23.5 degrees with respect to the orbital plane. |
how is paperless better than paper if paperless needs constant energy to be viewed | It's mainly cheaper to not send mail, once we get to 100% renewable energy it will be green |
How do supermarkets not detect your stuff as stolen if you buy multiple of them? | OP, the next time see how they handle multiple stuff that have rfid tags on them . I'm not sure but I doubt they secure stuff like Nutella with rfid tags. edit1: Don't roast me but I did some minor shoplifting as a kid. Stuff like fancy pencil sharpeners. I was never caught but I self-corrected cause it pulled on my co... |
What political power does the Queen actually have? | I think she can still veto things like Prime Ministers but in reality this never happens, as there would be a massive backlash from the public, the press, and the rest of the government, so what little power she does have, she chooses not to exercise as a matter of decorum. It's so little that all it would do is make e... |
How is statistical significance determined in formulas | Basically you can transform any data point into a z score through a series of steps. The z score distribution is what we use to determine significance, and it so happens that pinpointing the exact location of the average z score for a sample is easiest with large samples. A lot of time we just skip the language about t... |
Why arent there city compost/biodegradable waste programs similar to recycling and trash rather than just sending it all to the landfill? | It'll require more people to do more work. More people and labor means money leaving someone's pocket |
Why and how does the universe expand into nothing? | I don't think you're going to get one unanimous answer. However, if you're interested in this kind of stuff, there's an astrophysicist named Brian Cox who does a really good job of ELI5. [Here's one video on black holes.] |
Why do antiseptics kill single celled organisms like bacteria on contact but not kill our cells that contact them? | Single cells aren't built like our cells. They've got special cell walls and structures for interacting with the environment. Our cells mostly interact with other cells and systems in our bodies. Antiseptics are often chemicals that interact with the specific structures that single-cells have in a way that is detriment... |
Why do lightbulbs glow after they are turned off? | Depends on the type of bulb. The kind you're thinking of is the old halagon style bulbs which work by passing a high current through a relatively small wire which causes it to heat up significantly and release energy, some of which comes off as light. The bulbs brightness is relative to its temperature, and when we cut... |
How come blood transfusions can work even though the foreign blood cells contain the wrong DNA? | Just about the only thing that matters in a blood transfusion is the blood type. If two people have the same blood type they are compatible. But it can also work in some special cases where the blood types are different. Receiving blood from the wrong ABO group can be life threatening.\xa0For example, if someone with g... |
A cell splits to become 2 cells of equal size. at what point did the cell gain matter in the process? | It doesn't become 2 cells of equal size. The cell grows to the point that it's ready to split, it splits, and each new cell is half the size of the single cell, then they both grow until they're ready to split and it continues |
What is a tax return? | You've got it, mostly. Your employer withholds a certain amount for taxes, but they don't take in to account credits you might use when you actually figure out your taxes. |
Why is it so difficult to make reflections in video games? | Simple analogy: You have a flat surface you need to paint, if you want to make it look like bricks, you just paint bricks on the wall and you're done, you can add shadows and highlights based on the lighting in the room. Now you need to make it look like a mirror, you find that you need to paint a version of the room i... |
Why are patients given general anesthesia directed to count backwards by 7s? Why not just talk? | It's something that makes you think instead of rote reciting of something seared into your brain since you were 2 were they to ask for the alphabet or regular counting. That let's them better gauge when you're knocked out or not you could literally do some of those things in your sleep. But they also want a standardize... |
What reactions happen to our body that it is very important not to EAT before surgery? | A somewhat common side-effect of anesthesia is that you'll vomit. It can wind up in your lungs and cause a lot of problems. By not eating, the chances of it happening, and the impact if it does happen, is much lower. Outside of that, some procedures require it for functional reasons. For example, a colonoscopy/endoscop... |
How do armed services like CIA and DEA operate in other countries with firearms, and are there foreign operations doing the same in the United States? | The spies you see on TV and in movies are not accurate for what your average covert operatives for the CIA does. Most operatives are concerned with collecting information of which you do not need a firearm. As far as armed DEA agents doing swat style raids in other countries, that is done with the permission of the hos... |
why do people have to brush their teeth to maintain them but animals don't and still have a really good teeth health | We eat so many foods which aren't part of our original diet. Heavy usage of starches, refined sugars and acidic foods have led to higher levels of tooth decay. |
How did scientists find out that the universe is 13.7 billion years old | But if things are moving away from us How do we know how far they have moved based on light? I mean, aren't we technically seeing stars as they were hundreds of years ago? How do we have a point of reference to know where they started their journey? I mean.. What if they came from another bang or they just happened to ... |
How does a Computer actually generate audio? | There's much more going on than this, but basically the computers cpu sends the audio file to a dedicated chipset that handles audio, this chipset translates the digital 1's and 0's of the files into their respective analog voltages at varying frequency to the speakers. The audio chipset has a buffer that holds chunks ... |
How are major secrets in the entertainment industry (pre-release Marvel movie details, production on Beyonce's surprise album "Lemonade", etc.) kept from getting out and going viral every time? | It's a combination of a lot of things. Pride in one's work, fear of being fired , tight controls over information. The people who actually work on these projects care about them and don't want to hurt them and put themselves at risk by leaking information about them. The people who don't work on them are kept in the da... |
How do snakes stay hydrated/drink water? | I don't have a video, but I've watched one drink. Puts its mouth in and, well, gulps. I thought there would be more of a tongue thing, but that wasn't visible. I guess now I will try to video it! |
When in a pc game, how can I tell the sound I hear is from behind with a stereo headset? | In real life, you use your 2 eyes to see in 3D. We also have 2 ears which means we hear in 3D too. Our brains triangulate where sounds are coming from by mixing what each ear hears together, each ear won't hear the same thing because you have a head in the middle. If you are hearing a sound, say, directly to the left o... |
How can Minecraft generate a world that can be reproduced down to every exact block based on an 8-16 digit seed number? | The seed is run through an algorithm. Potentially there are 4 billion or so different seeds available. Assuming the terrain generator is the same for each client the same seed will be processed the same way. They won't be 100% identical though. It's important to remember that. As far as I'm aware there are still random... |
Why do people (or even do they) but those infomercial collectible coins? like the Morgan silver coins? Are they worth their value or something else I am missing? | They should have some melt value, but that will not be near the price of the coin as then the company wouldn't make money. Edit, their mix of some real metals and some .999 clad is quite tricky. 20 dollar coins clad with 2 cents of real silver. Ouch |
How does debt consolidation work? | Like they said, you bring all your debts together into one loan. Generally loans are lower APR then credit cards. So it can be good to move your credit card debt into a loan. Still check what the rates you have are and compare versus what you can get on a consolidation loan. Watch out for fine print, if the loan APR ca... |
Why does your heart rate improve the more you work out? | Your muscles, heart and circulatory system, metabolism pretty much everything, adapt to the load we put on them. They become stronger and more efficient, the opposite happens if we don't use them, they become weaker and less efficient. That's the principle of how training works, you will gradually improve and have to k... |
How can someone get six life sentences if they only have one life? Why isn’t there just one life sentence? | It serves two purposes. Firstly this penalty is typically used to prevent the possibility of parole since one life sentence doesn't mean the entirety of the felons life rather the term in that state which reflects the time it takes to become a new person and hopefully rehabilitate and since life without parole is given... |
Why does coffee taste different first thing in the morning vs. afternoon? | Depends on what you mean. If you're asking about the same pot tasting different, it's because the natural bittering agent in coffee has more time to steep, especially if you're reheating it, and makes the coffee taste more sour and unpleasant. As for a new cup of coffee in the afternoon, it's because in the morning it'... |
Economic wizez! Why is the profit of a company maximized when the marginal cost (MC) equals the marginal revenue (MR)? | Not sure if you're in mathematics but this is how my mathematical mind translated this many years ago. It might help. You have 3 functions profit, cost and revenue all as a function of production your independent variable. profit = revenue - cost You want to find the maximum profitable production level. Take the differ... |
How did we decide the time value of a second? | A second is a second, is called a second, because it's the second division of an hour into 60ths.Its the 9192631770 times of a half-life from Cesium 133 |
how do outside temperature readings in cars not be impacted by windchill, engine heat, or being baked by the sun? | Wind doesn't cause the actual temperature to change, except in certain conditions such as when something is wet. Wind chill is just used for human perception of temperature as the wind affects it. |
What is it that causes the 'sweet spot' on a manual transmission to feel like it's in different places throughout each of the different gears? | First off, what are you driving? Some cars have vacuum-assisted clutch hydraulics, and have slightly different feel based on engine speed. Otherwise, in normal operation, the friction zone shouldn't move. |
why can't we feel the earths speed? | You can't feel the speed in a car either. You can feel accelerating or braking, but once you reached a certain speed and can hold it, you won't notice anymore, if you are in a closed system. You only know you are going fast, because you can see the objects around you passing so quickly. You can move quite freely in a p... |
The function of UNLESS. I don't know how to explain certain parts of this words uses. | 'A' unless 'B' basically means if 'B' is false then 'A' is true, but if 'B' is true then 'A' is possibly false. 'You wouldn't be rude to your friends' = 'A' unless 'they didn't invite you to the party' = 'B' Case 1: 'B' is false = they did invite you to the party - > 'A' is true = you wouldn't be rude to your friends C... |
how does not voting or voting for a small party affect the outcome of an election? | > Basically I am asking who it favours if people choose not to vote. I am considering not voting in my country's general election at all since the ruling party and opposition party have made some really bad moves in the last few years. Or I would consider voting for a smaller party whoe policies I can support. Just won... |
What exactly is a magnet pulling from the other metal? | Re-title to ELI'm 25 and in grad school? Your question is already way up there in EM, the answers are fairly involved. Read here and follow links that look interesting: _URL_1_ _URL_0_ I always found it to be a good resource when I was stuck and needed to get back to the basics before going forward again. It's not real... |
why does getting stabbed by a pencil leave a permanent mark? | Tattoo. My dad had one too but a bit of the lead was still the he said. I think it's more like how a tattoo is done. Interested to learn the correct answer too as I have always wondered. |
Ok so lets assume that RNA randomly arranged itself on early Earth, how was it able to copy itself? Why is this specific arrangement of atoms so special? | Well, it's not that a particular strand of RNA gained some intelligence and learned how to make more of itself. So, imagine there's a big soup of chemicals making new compounds pretty much randomly. Eventually a particular formation of atoms comes together in such a manner that it just so happens it is able to alter th... |
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