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the encyclopedic entry of orbit In physics, an orbit is the gravitationally curved path of one object around a point or another body, for example the gravitational orbit of a planet around a star. Historically, the apparent motion of the planets were first understood in terms of epicycles, which are the sums of numero...
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angle between the vectors .......... a) Ok, so we have two vectors a = <3, 2, sqrt(3)> b = <3, 1, sqrt(6)> We should begin by determining some kind of formula for this: ||a||*||b||cos(x) = a*b So first we find the magnitude of each of these vectors, which is: ||a|| = (9 + 4 + 3)^.5 = 4 ||b|| = (9 + 1 + 6)^.5 = 4 We sho...
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Homework Help Posted by Artmisha on Friday, May 30, 2014 at 2:16pm. For 3 and 4 find the range, variance, and standard deviation. Round to the nearest tenth. 3. Twelve students were given an arithmetic test and the times (in minutes) to complete it were 10, 9, 12, 11, 8, 15, 9, 7, 8, 6, 12, 10 4. The normal daily t...
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MathGroup Archive: August 2007 [00170] [Date Index] [Thread Index] [Author Index] Re: Integration with non-numeric parameters • To: mathgroup at smc.vnet.net • Subject: [mg79793] Re: Integration with non-numeric parameters • From: Pet...
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real roots for polynomials MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required. Is there any necessary and sufficinet condition for a complex polynomial to have a real root? A complex polynomial ...
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Common Core Standards : CCSS.Math.Content.HSN-CN.A.1 Common Core Standards: Math Math.CCSS.Math.Content.HSN-CN.A.1 1. Know there is a complex number i such that i^2 = -1, and every complex number as the form a + bi with a and b real. It's a little-known fact that in Disney World, in the Journey into the Imagination ...
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math-radical equations Posted by Jennifer on Sunday, May 4, 2008 at 3:48pm. Here's one of the questions I have problems with: cube root of (x+2)=6th root of (9x+10) A. -1, 6 B. [-13 +/- sqrt(193)]/2 C. 1, -6 D. [13 +/- sqrt(145)]/2 Please explain how to solve this. Should you cube both sides, or raise both to th...
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Lin. Transformation October 1st 2007, 05:25 PM #1 Member Joined Sep 2006 Posts 221 Lin. Transformation NOTE: [a, b, c, d] <-- form is a vector and BOLD denotes a vector, unless referring to R. Suppose that T is a linear transformation from R^4 to R^3, defined by: T(e_1) = [1, 5, 3], T(e_2) = [2...
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Math-Population Word Problem Posted by Jake on Tuesday, March 26, 2013 at 9:34pm. The population of rabbits in a national forest is modeled by the formula P=8,600+650 ln(t+1) where "t" is the number of years from the present. a)How many rabbits are now in the forest b)Estimate when it will take for the number of rab...
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Homework Help Posted by Anonymous on Wednesday, February 2, 2011 at 12:32pm. A ball is shot straight up into the air with initial velocity of 47 ft/sec. Assuming that the air resistance can be ignored, how high does it go? • Calculus - helper, Wednesday, February 2, 2011 at 2:11pm A ball is shot straight up in...
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graphs in math Posted by Pam on Sunday, January 20, 2013 at 2:35am. C varies inversely as J. If C = 7 when J = 0.7, determine C when J = 12 • graphs in math - Reiny, Sunday, January 20, 2013 at 8:44am C varies inversely as J ---> C = k(1/J) , where k is a constant when C=7, J=.7 7 = k(1/.7) k = 4.9...
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Curves Next: Surfaces Up: Coordinate Geometry Previous: Conics To emphasise the obvious, the fundamental difference between lines and curves is that the latter are ``curved''. How do we quantify this ``curvy-curvy''-ness or curvature? We shall give a definition and examine some properties. Let C denote the curve...
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Chain rule for exponential functions February 11th 2010, 12:52 PM Jools Chain rule for exponential functions I have a question I could use a little help with here... Find the equation of the tangent to the function f(x) = 3^(x^2+1) - x^2 at (1 , 8) I have used the difference rulwe and the chain rule f...
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Combinatorial Properties and Characterization of Glued Semigroups Abstract and Applied Analysis Volume 2014 (2014), Article ID 436417, 8 pages http://dx.doi.org/10.1155/2014/436417 Research Article Combinatorial Properties and Characterization of Glued Semigroups ^1Departamento de Matemáticas, Universidad de Cádiz, ...
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trapezoid and circle December 15th 2006, 07:34 PM Dragon trapezoid and circle An isosceles trapezoid is inscribed in a semi circle as shown below such that the nonshaded regions are congruent the radius of the semi circle is one meter. How many square meters are in the area of the trapezoid? December 15th 2...
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Latin American applied research Servicios Personalizados Articulo Indicadores Links relacionados Bookmark versión impresa ISSN 0327-0793 Lat. Am. appl. res. v.34 n.4 Bahía Blanca oct./dic. 2004   Minimum gas flow rate in a countercurrent isothermal gas stripper A. Silva, C. Castillo and J. H. Krasuk^* Departa...
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Determine the Potential Function January 14th 2012, 07:26 AM #1 Determine the Potential Function Folks, Find the potential function for $F(x,y)=-2xy^3 \vec i -3x^2y^2 \vec j$ IF we take $\phi_x= -2xy^3$ and $\phi_y=-3x^2 y^2$ Integrating the first one wrt x gives $\phi (x,y)=\int -2xy^3 dx = -...
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Triangle w/semicircle, calculating area, changing variables in length June 7th 2009, 06:31 PM #1 Triangle w/semicircle, calculating area, changing variables in length I'm reviewing for finals but this geometry question got me. The figure above is an isosceles right triangle with a semicircle attached a...
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pure type system Context Type theory Deduction and Induction Foundations The basis of it all Foundational axioms • basic constructions: • strong axioms Removing axioms Contents Idea A pure type system is an explicitly typed lambda calculus using dependent product as the type of lambda expressions: the ba...
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I need help again also would like to see if someone can double check for me September 11th 2005, 05:46 PM #1 Newbie Joined Aug 2005 Posts 16 I need help again also would like to see if someone can double check for me These are the ones I could use help with: Reduce to lowest term: x^2-y^2 ---...
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Infinite series (8) Consider: $\sum_{k=1}^{2n}{(-1)^k\cdot \tfrac{\log(k)}{k}}=2\sum_{k=1}^{n}{\tfrac{\log(2k )}{2k}}-\sum_{k=1}^{2n}{\tfrac{\log(k)}{k}}$ Note that: $\sum_{k=1}^{n}{\tfrac{\log(2k)}{2k}}=\frac{1}{2}\c dot \left(\log(2)\cdot \text{H}_n+\sum_{k=1}^{n}{\tfrac{\log(k)}{k}}\righ t)$ So we have: $\sum_{k=1}^...
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Knewton Challenge Discussion – GMAT Data Sufficiency (Rembolse Insurance) - This is a Data Sufficiency problem from Session 5, Extra Practice HW 3 (Quantitative Strategy). So far, 49.6% of Knewton students have missed it. How would you approach it? Try it out, then share your answers, questions, and thought processes ...
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Need help! Minimum Problem October 14th 2009, 10:57 PM Zippyz Need help! Minimum Problem Hi (Hi) 9t^4 + 6t^2 + 2 the problem is asking for the value of t at which the graph is at it's minimum. what i did was set t^4 to x^2 and t^2 to x. So that means I have 9x^2 + 6x + 2. Completing the squa...
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How to find the y-intercept and slope. December 2nd 2007, 04:50 AM #1 Newbie Joined Nov 2007 Posts 4 How to find the y-intercept and slope. Hi ppl. If Im given the coordinates below: x: 32, 48, 64, 80, 96, 112 y: 6, 9, 12, 15, 18, 21 How do I find the slope and the y-intercept of the l...
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Find cot(x) Function: csc(x)=-2 Quadrant: 4 find cot. Anyone? Last question of the year. $<br /> \frac{1}{sinx} = -2<br />$ $<br /> -2sinx = 1<br />$ $<br /> sinx = -\frac{1}{2}<br />$ $<br /> sin^{-1}\left(-\frac{1}{2}\right) = -\frac{\pi}{6}<br />$ easy to get $cotx$ from this since $cosx(-\frac{\pi}{6}) = -\frac{\s...
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Binomial {stats} The Binomial Distribution Description Density, distribution function, quantile function and random generation for the binomial distribution with parameters size and prob. Usage dbinom(x, size, prob, log = FALSE) pbinom(q, size, prob, lower.tail = TRUE, log.p = FALSE) qbinom(p, size, prob, lower.ta...
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one more identity to prove $\frac{\sin{2x}}{\cos{x}} + \frac{\cos{2x}}{\sin{x}} = \frac{2\sin{x}\cos{x}}{\cos{x}} + \frac{\cos^2{x} - \sin^2{x}}{\sin{x}}$ $= 2\sin{x} + \frac{\cos^2{x} - \sin^2{x}}{\sin{x}}$ $= \frac{2\sin^2 {x} + \cos^2{x} - \sin^2{x}}{\sin{x}}$ $= \frac{\sin^2{x} + \cos^2{x}}{\sin{x}}$ $= \frac{1}{\s...
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Factorization May 13th 2013, 11:04 PM #1 Hi there! How does one factorize $x^3 + (x^-3) - 2$? I tried factorizing it by $x^3 - 1 + (x^-3) -1$ and a few other methods but couldn't really get close to the answer. Thanks Re: Factorization let x^3 = a The equation becomes a + 1/a -2 = 0 ...
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ouchdb Dear Wiki user, You have subscribed to a wiki page or wiki category on "Couchdb Wiki" for change notification. The "View_Snippets" page has been changed by RobertNewson: http://wiki.apache.org/couchdb/View_Snippets?action=diff&rev1=42&rev2=43 Comment: Remove misleading or incomplete examples If you then wa...
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addition formula, April 5th 2009, 01:47 AM #1 Junior Member Joined Jan 2009 Posts 57 addition formula, Hi, I have a proof for $cos( \theta + \delta) = cos \theta cos\delta - sin \theta sin \delta$ Apparently by writing $(\frac{\pi}{2}-\delta)$ for $\delta$ and using $cos(\frac{\pi}{2}-\delta)=s...
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Integration by trig substitution June 3rd 2008, 09:07 PM #1 Member Joined Jun 2008 Posts 175 Integration by trig substitution Trying to do the indefinate integral of x^3 * (9-x^2)^1/2 by using the substitution of x = 3 sin u I get 81* integral[ (sin^3 u)(cos u)] but again I appear to be wrong. $x = ...
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Expected Value for Poisson August 31st 2011, 01:52 PM #1 Junior Member Joined May 2008 Posts 37 Expected Value for Poisson A little context, here is the problem I am working on: For a random variable X, let g(X) be given by g(X) = abs(X - m(X)), where m(X) is the median of X. Find g(X) for a Poisson...
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Fourier Transform - not sure if I totally understand? February 5th 2010, 03:09 PM MeganKnox Fourier Transform - not sure if I totally understand? So the question states: Find the fourier transform of the function f defined by: f(x) = -e^(ax) x<0 = e^(-ax) x>0 I think I know what I'm doing, but t...
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Integration by trigonometric substitution September 5th 2010, 09:59 PM #1 Senior Member Joined Feb 2008 Posts 297 Integration by trigonometric substitution Could someone check whether I've got the correct answer for the following integrals? 1. $\displaystyle\int{\dfrac{dx}{x^2\sqrt{x^2+16}}$ I ...
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Weird integral on assignment September 13th 2008, 02:20 PM #1 Junior Member Joined Feb 2008 Posts 29 Weird integral on assignment this integral appeared on an online assignment, but im really having troubles figuring out the domain region D on this. I could simply use the upper and lower limits to sketch...
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help req/d proving an identity please? December 7th 2009, 12:11 PM #1 Newbie Joined Nov 2009 Posts 17 help req/d proving an identity please? hi there can anyone get me a little bit further with this question? prove the identity: cos 3x = 4cos^3x -3cosx cos 3x can also =cos(2x+x) so far ...
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one derivative and one integration July 11th 2007, 12:44 PM #1 Junior Member Joined Jul 2007 Posts 72 one derivative and one integration I am having trouble with this derivative: y = (2x+3/2x-3)^(1/4) The whole fraction is raised to the 1/4 power..I am not so sure where to start but I need to do ...
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Homework Help Posted by toma on Tuesday, December 11, 2012 at 4:18am. A bacteria culture contains 200 cells initially and grows at a rate proportional to its size. After half an hour the population has increased to 360 cells. (a) Find the number of bacteria after t hours. (b) Find the number of bacteria after 4 hour...
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Comaximal Ideas in a Principal Ideal Domain March 14th 2013, 01:43 AM Bernhard Comaximal Ideas in a Principal Ideal Domain Prove that in a prinicpal ideal domain, two ideals (a) and (b) are comaximal if and only if a greatest common divisor of a and b (in which case (a) and (b) are said to be coprine or realtive...
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maximum error percentage September 4th 2008, 10:40 PM #1 Member Joined May 2008 Posts 77 maximum error percentage period T of a simple pendulum with small oscillations is calculated: $T=2\pi \sqrt{\frac {L}{g}}$ L = length of pendulum, with 0.5% max error value g = acceleration due to gravi...
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exponential function, I can't solve this problem. October 11th 2009, 06:40 PM #1 Junior Member Joined Oct 2009 Posts 29 exponential function, I can't solve this problem. I've been struggling with this and I even asked 2 friends of mine to help me but they couldn't solve it. Unfortunately, I can't fi...
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Homework Help Posted by Z32 on Thursday, September 17, 2009 at 7:56pm. I wanted to know how you would know that -4x^2 + 2x +90 / x-5 would be able to factor down to (x-5)(-4x-18)/x-5 By looking at -4x^2 + 2x +90 / x-5 , I would never think that it could be factored down to (x-5)(-4x-18)/x-5 How should I approach it ...
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Double Angle Question W/Picture. Use the Pythagorean Identity to simplify the double angle identity you've been given so far... \displaystyle \begin{align*} \sin^2{(x)} + \cos^2{(x)} \equiv 1 \end{align*}, so that means \ displaystyle \begin{align*} \cos{(2x)} &\equiv \cos^2{(x)} - \sin^2{(x)} \\ &\equiv 2\cos^2{(x)} -...
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Homework Help Posted by Alex on Saturday, November 6, 2010 at 8:39pm. Let F be the function defined by F(X)=12X to the 2/3 power minus 4X Find the intervals of which F is increasing? Find X & Y coordinates of all relative max. pts? Find X and Y Coordinates of all relative min pts? Find the intervals of which F is conc...
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Math Help January 18th 2013, 09:36 PM #1 Junior Member Joined Aug 2012 From us Posts 66 power set 1. Is the power set P({1, {1,2}}) has an element {{ }, {1,2}} ? 2. Is R^2⊆R^3 false simply because of the different dimensions? 3. What is P(P(R^2))? If I view P(R^2) as any possible set of poin...
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Please help me with something my teacher didn't teach us How do you do this problem? Which points on the graph of y=4-(x^2) are closest to the points (0,2)? Welcome to the Math Help Forum! To find the point on $y=4-x^2$ closest to $(0,2)$, we first do as VonNemo said and use the distance formula to obtain a function o...
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Senior Maths Challenge question November 5th 2009, 02:32 PM 123ohrid Senior Maths Challenge question Hello lads. So I did my senior maths challenge today, and there was a question which struck me as being difficult. I even asked my maths teacher and he couldn't solve it as fast as he could. So who can run me...
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Discrete Model Reference Adaptive Control System for Automatic Profiling Machine Journal of Control Science and Engineering Volume 2012 (2012), Article ID 964242, 5 pages http://dx.doi.org/10.1155/2012/964242 Research Article Discrete Model Reference Adaptive Control System for Automatic Profiling Machine College of...
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Math Help November 13th 2007, 12:24 PM #1 Senior Member Joined Jul 2007 Posts 290 Ellipses I get the general idea of finding the Verticies, Foci, Eccentricity, Major Axes, and the Minon Axes. However i'm having trouble doing it with this problem 2x^2 + y^2 = 3 Can someone point me in the...
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Homework Help Posted by Priscilla on Saturday, December 26, 2009 at 9:03am. A race car can be slowed with a constant acceleration of -11 m/s^2 a. If the car is going 55 m/s, how many meters will it travel before it stops? b. How many meters will it take to stop a car going twice as fast? I know you use the equation...
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Trigonometric Equations Thru what method would you solve this problem? cos^2x = sin^2x +1 Linear Method Factoring Quadratic Formula Squaring Are we limited to those four methods? If not, then I will use substitution as the first step, and then I will see the resulting equation. It could then be by factoring or by usin...
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finding minimal point October 28th 2010, 06:40 PM #1 Junior Member Joined Oct 2009 Posts 57 finding minimal point I'm having trouble with this question... To find the minimal point, is there an easier way other than plugging in all possible values? Compute the polar coordinates and the xy-coord...
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Exam Review - Geometric Vectors June 21st 2008, 05:47 AM #1 Member Joined Nov 2007 Posts 232 Exam Review - Geometric Vectors A light plane is travelling at 175km/h on a heading of N8°E in a 40km/h wind from N80°E. Determine the plane's ground velocity using geometric vectors. $|r| = \sqrt {175^2 + 4...
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Union and Intersection proof September 30th 2012, 05:41 PM fallenstars16 Union and Intersection proof For a set of Y real numbers define a function C[Y] by; C[Y](x)= {1 if x ∈Y, 0 if x is not ∈ Y. Let Y and Z be a set of real numbers, find expressions for C[YUZ] and C[ynz] YUZ={x∈R|x∈Y or x∈Z} ...
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Find height of liquid inside spherical container as it is being filled September 14th 2010, 03:13 PM surfertmex Find height of liquid inside spherical container as it is being filled Here is the problem: "A spherical container with a radius of 15cm is being filled at a constant rate of 250╥ ml/sec. What is ...
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New View of Statistics: Log Transformations A New View of Statistics © 2000 Will G Hopkins Go to: Next · Previous · Contents · Search · Home Generalizing to a Population: MODELS: IMPORTANT DETAILS continued Log Transformation for Better Fits In log transformation you use natural logs of the values of the variabl...
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Leaping frog Game September 23rd 2006, 02:38 AM Natasha1 Leaping frog Game I wandered if anyone could give me as much as possible info on the task I need to investigate at: http://maths.fallibroome.cheshire.sch.uk/leapfrog.swf I have worked out that frog 3 blue frogs and 3 green frogs it will take me 1...
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Solving Quadratic Systems of Equations May 10th 2008, 01:52 PM mathgeek777 Solving Quadratic Systems of Equations I have this system: $x^2+2y^2-4x+6y-5=0$ $-x+y-4=0$ And I have to find the intersecting points of the two equations by using substitution and only substitution. I solved the bottom...
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Limits of Exponential Functions Everyone has their limit; logs and exponents are no different. Let's look at the exponential function y = 4x. No matter what value of x you throw into it, though, you can never get y to be negative or zero. (How optimistic of it.) Try a few: 4^2, 4^3, 4^4 = 16, 64, 256 4^0 = 1 4^-2 =...
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Homework Help If the average speed of an orbiting space shuttle is 19600 mi/h, determine the time required for it to circle the Earth. Make sure you consider the fact that the shuttle is orbiting about 200 mi above the Earth's surface, and assume that the Earth's radius is 3963 miles • physics - tchrwill, Thursday, ...
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Exponential distribution March 21st 2008, 08:16 AM #1 Member Joined Jan 2008 Posts 154 Exponential distribution Suppose that $\theta \sim \text{Exp}(\lambda)$. An estimator for $\theta$ is $\bar{X}$. Suppose that we know that $\frac{2n \bar{X}}{\theta} \sim \chi^{2}_{2n}$. Construct a $100(1-\alpha) \%$ ...
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Show the following sets are rings October 3rd 2011, 02:46 PM ehpoc Show the following sets are rings I am asked to show that the following sets are rings. And determine if they commutative. A set that is a ring...... if you didn't know is (I am sure you did though)... Quote: 1. Closure under addi...
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\varphi'''-\lambda\varphi=0 February 17th 2011, 04:10 PM #1 MHF Contributor Joined Mar 2010 From Florida Posts 3,093 Thanks 5 \varphi'''-\lambda\varphi=0 $\varphi'''-\lambda\varphi=0$ $\varphi_1(0)=1, \ \varphi_2(0)=0, \ \varphi_3(0)=0$ $\varphi_1'(0)=0, \ \varphi_2'(0)=1, \ \varphi_3'(0...
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basic equations November 8th 2007, 08:08 AM #1 Newbie Joined Oct 2007 Posts 21 basic equations solve for x,y, and z 31x+12y-24z=105 18x+24y+z=77 12x+6y+4z=5 ive tried doing this several ways, but i get different answers every time. all i am able to really do is get rid of y by multiplying...
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Math Help July 16th 2009, 03:35 PM #1 Newbie Joined Aug 2008 From Butler, NJ Posts 18 Investment An investment advisor is planning the retirement of a customer. The customer has $10,000 dollars to invest and needs the investment to increase to $30,000 within 20 years...so 20 years or less. ...
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Math: Number Theory - Percents Author Message TAGS: Math: Number Theory - Percents [#permalink] 22 Mar 2010, 14:24 25 ...
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Help me for nonlinear hyperbolic first order system of pde June 19th 2008, 04:56 AM #1 Newbie Joined Jun 2008 Posts 1 Help me for nonlinear hyperbolic first order system of pde Hi, i have a problem with the solving of nonlinear hyperbolic first oder system of pde. This look like following Can...
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Fibonacci ICS 161: Design and Analysis of Algorithms Lecture notes for January 9, 1996 Introduction to analysis of algorithms An algorithm is just the outline or idea behind a program. We express algorithms in pseudo-code: something resembling C or Pascal, but with some statements in English rather than within the p...
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How To integrate this? March 1st 2009, 07:52 PM #1 Newbie Joined Jan 2009 Posts 20 How To integrate this? $<br /> \int (x^2)/(\sqrt(9+x^2)) dx<br />$ ** Thats the best I can make this equation look... Anyways I have been trying to get this thing for hours, I clearly do not know what I'm doing. ...
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Homework Help Posted by kc on Sunday, July 24, 2011 at 8:47pm. find the exact solutions in the interval [0,2pi), sin4x=-2sin2x • pre cal 2 - Reiny, Sunday, July 24, 2011 at 11:00pm sin4x=-2sin2x 2 sin2xcos2x = -2sin2x, ......... since sin2A = 2sinAcosA cos2x = -1 2x = 180°, 360°, 540°, 720° which i...
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Last maths question in the Oxford Physics Aptitude Test November 10th 2008, 08:33 AM #1 Junior Member Joined Mar 2008 Posts 31 Last maths question in the Oxford Physics Aptitude Test On the Oxford Physics Aptitude Test, this was the last question in the maths section. I got $<br /> \frac{9\...
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anyone can help me in probability!!! November 25th 2007, 01:33 PM #1 Newbie Joined Nov 2007 Posts 2 Hi every body i have small problem in probabiltity the problem is A university have 5 English sections ,if we distribute another 4 students to these sections 1_ Find the probability that 2 o...
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Is this right? Finding function f(x) given tangent slope and f''(x) May 14th 2008, 10:41 PM #1 Member Joined May 2008 Posts 77 Is this right? Finding function f(x) given tangent slope and f''(x) Now I think I have the correct answer, but am not 100% sure. Is it correct, and if not, where did I screw up? ...
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Hooke's law with spring bearhug When a 4.00 kg object is hung vertically on a certain light spring that obeys Hooke's law, the spring stretches 2.50 cm. (a)If the object is replaced with one of mass 1.50 kg, how far will the spring stretch? b) How much work must an external agent do (i.e. a force coming from the 'envi...
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arithmetic progression Posted by Anonymous on Sunday, October 16, 2011 at 5:08pm. given that the first term of an Ap is 7 and its 10th term is twice the second term calculate the 19th term. • arithmetic progression - Reiny, Sunday, October 16, 2011 at 5:19pm a = 7 a+9d = 2(a+d) 9d +a = 2a+ 2d 7d = ...
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Legendre Symbol and Quadratic Reciprocity January 24th 2010, 09:29 AM #1 Newbie Joined Feb 2009 Posts 7 Legendre Symbol and Quadratic Reciprocity The question asks to define a Legendre symbol and use the Law of Quadratic Reciprocity to determine whether 135 is a quadratic residue modulo 283. I alrea...
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MathGroup Archive: January 2004 [00348] [Date Index] [Thread Index] [Author Index] Re: StruveH runtime error • To: mathgroup at smc.vnet.net • Subject: [mg45680] Re: StruveH runtime error • From: vb at cybertester.com (Vladimir Bondar...
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amplitude of guitar string October 7th 2009, 05:00 PM #1 Newbie Joined Sep 2009 Posts 4 amplitude of guitar string Hey everyone, i need a hand with a question i have for an assignment... a guitar string is vibrating in its fundamental mode, with a node at both ends. Given the length (0.390m). The ma...
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On Einstein's explanation of the invariance of c 1. Here's what Motor Daddy's equations look like for the 3-D problem from two pages back: t(x) = 1.201 seconds v(x) = (ct - l) / t v(x) = (1.201 - 1.000) / 1.201 = 0.167c t(y) = 1.336 seconds v(y) = (ct - l) / t ...
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cardinality December 8th 2009, 03:43 PM #1 Newbie Joined Dec 2009 Posts 2 Show that the sets [2,4] u [6,10] and (-2,2) have the same cardinality.(using the Schroeder-Berstein Theorem) so I have to define f: [2,4] u [6,10] --> (-2,2) by f(x)= any f(x) I get that works... when you inverse it so that I d...
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SKM Systems Analysis, Inc. - Power System Software and Arc Flash Hazard Analysis and Design Solutions Off-nominal Transformer Tap Settings A transformer with turns ratio a interconnecting two nodes i, k can be represented by an ideal transformer in series with the nominal transformer leakage admittance as shown in Fi...
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[SOLVED] easy complex number questions October 22nd 2009, 10:17 PM #1 Member Joined Dec 2008 From Australia Posts 161 hi, could someone check the answers of these for me? btw, the book says that they are all wrong. i dont understand why. 1. If z = 2 + i, evaluate: a) 3z = 6 + 3i b) $(z-1...
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Proof about relations March 16th 2013, 03:05 PM #17 Newbie March 16th 2013, 03:01 PM #16 Newbie Re: Proof about relations ?? Re: Proof about relations I don't understand this example. Which are the elements of R? The best I could come up with was an example: A={1.2.3.4,5} R = < R[A]=(1,2),(1,3),(1,4),(...
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cyclic group September 6th 2009, 07:11 PM MathBird cyclic group Need some help on the following 2 related problems: Show that any finitely generated subgroup of the additive group of rationals (Q,+,0) is cyclic. Prove that this group is not isomorphic to the direct product of two copies of it. September...
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[SOLVED] population proportion August 30th 2009, 12:22 AM #1 Member Joined Oct 2008 Posts 206 [SOLVED] population proportion 2 populations are independently surveyed using s.r.s of size n, and 2 proportions, p1 and p2, are estimated. It is expected that both population proportions are close to 0.5. What ...
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objective and eyepiece lens Posted by katherine on Friday, May 22, 2009 at 3:31am. What is the approximate magnification of a compound microscope with objective and eyepiece focal lengths of 0.3 cm and 3.6 cm, respectively, and a separation between lenses of 20 cm? The answer is 460. I tried finding the magnificatio...
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The Computational Life I regret to inform that I will no longer be updating this blog. However, if you're interested in any further writing I might do on evolution, programming, and the like, I encourage you to follow me on Twitter. I'll post updates there. Follow @elirm Disclaimer: All characters depicted in the foll...
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Solving quadratics (mod p) March 29th 2007, 04:06 PM #1 Newbie Joined Mar 2007 Posts 5 Solving quadratics (mod p) I have a question. I am interested in finding the solution to congruences of the form: x^2 + ax + b = 0 (mod p) with p a large prime. I am interested in an algoirthm for finding solution...
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Predictive Tracking in Vision-based Hand Pose Estimation Using Unscented Kalman Filter and Multi-viewpoint Cameras 1. Introduction One of the major challenges in human-robot interaction is how to enable the use of unrestricted hand motion as a tool for communication. The direct use of hand as an input tool enables the...
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Polynomial rings - zero divisors in R and r[x] Show that if R has no zero divisors then R[x] also has no zero divisors. Thinking about this problem ... Let $f(x) = a_n x^n + ... + a_1 x + a_0$ and $g(x) - b_n x^n + ... + b_1 x + b_0$ Then $f(x)g(x) = c_{m+n} x^{m+n) + c_{m+n- 1} x^{m+n-1) + ... c_1 x + c_0$ where $c_k...
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Homework Help Posted by Jules on Saturday, April 23, 2011 at 2:42pm. Could someone answer this question so I understand it. Thanks Given the supply function: p = S(x) = 5(e^0.02x-1) Find the average price (in dollars) over the interval [31,36]. Only the 0.02 is ^ in the e in the question. • economics - bobpursl...
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Revista de la Unión Matemática Argentina Servicios Personalizados Articulo Indicadores Links relacionados Bookmark versión On-line ISSN 1669-9637 Rev. Unión Mat. Argent. v.47 n.1 Bahía Blanca ene./jun. 2006   Dolbeault cohomology and deformations of nilmanifolds Sergio Console Abstract: In these notes I revie...
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Proof Help!! March 24th 2008, 10:01 PM #1 Super Member Joined Feb 2008 Posts 535 Proof Help!! Prove that: "The summation" from k=2 to n of (k choose 2) = (n+1 choose 3). Let n be a natural number. Please Help. thanks! Hello, jzellt! It helps if we know a few summation formulas: ....
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Gauge theories From Scholarpedia Gerard ′t Hooft (2008), Scholarpedia, 3(12):7443. doi:10.4249/scholarpedia.7443 revision #141891 [link to/cite this article] Gauge theories refers to a quite general class of quantum field theories used for the description of elementary particles and their interactions. The theorie...
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Solve for x: 0<|x|-4x<5 = ? Author Message TAGS: Solve for x: 0<|x|-4x<5 = ? [#permalink] 15 Aug 2009, 23:44 4 This post was ...
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multiple roots Let f(x) be an irreducible polynomial over Q of degree n>1. Prove f(x) has no multiple roots. I think OP wants to prove that any extension of Q is separable? If a is a repeated root, then you can show that a is a root of both f(x) and f'(x), where f' is the derivative of a polynomial, defined not by lim...
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trignometric identities November 23rd 2011, 07:34 PM #1 Member Joined Feb 2010 From in the 4th dimension.... Posts 122 Thanks 9 trignometric identities prove that: 1. $\frac{\sin A + \sin 2A}{\cos A - \cos 2A} =\cot (A/2)$ 2. $\frac{1+\cos A}{\sin A} = \cot (A/2)$ please help... Re:...
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Basic but frustrating maximisation problem August 8th 2011, 04:08 AM #1 Newbie Joined Aug 2011 Posts 23 Basic but frustrating maximisation problem Please help me with this basic problem that I cannot solve; Consider the following equation U=(H-h) * (I^(1-e))/1-e and the following identity ...
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Simple Equation June 29th 2010, 07:35 PM #1 Newbie Joined May 2010 Posts 22 Thanks 1 Simple Equation I was wondering if someone could show me the way to write this one up. The sum of a number and it's reciprocal is 2 1/6 . What is the number? (sounds like fraction) I got this far...... ...
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[ -0.033935546875, -0.0380859375, -0.05615234375, 0.046142578125, -0.03076171875, -0.01806640625, -0.0634765625, -0.0016937255859375, -0.00156402587890625, -0.0908203125, 0.0296630859375, 0.0286865234375, -0.0311279296875, 0.019775390625, 0.0089111328125, 0.04345703125, -0.05029296875,...
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sketch on complex plane January 15th 2009, 05:59 PM #1 Junior Member Joined Oct 2008 Posts 39 sketch on complex plane sketch abs(3z-2+5i)<3 i replace z with rcis(theta) then do you move the other terms the the other side of the inequality and use them as asymptotes? so it would become a ci...
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[ -0.09521484375, 0.01318359375, -0.03662109375, -0.02099609375, 0.023193359375, -0.0849609375, -0.045166015625, 0.07861328125, 0.0010833740234375, -0.036865234375, -0.018798828125, -0.07470703125, 0.06787109375, 0.03173828125, 0.0223388671875, -0.0625, 0.0184326171875, -0.1108398437...
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