Procedure Definition and 89 Threads

So I want to be able to draw the phase portrait for linear systems such as: x'=x-2y y'=3x-4y I am completely confused, but this is what I have come up with so far: Step 1: Write out the system in the form of a matrix. Step 2: Find the eigenvalues and eigenvectors for the matrix. Step...

I think I found a procedure (other than the extended Euclidean algorithm) to compute the multiplicative inverse of a number; possibly a simpler method. It goes like this: ***EDIT: Ah, dang. I made a mistake. It will only work for a prime modulus. Suppose we need to find x satisfying ax \equiv...

Please teach me this: I do not understand why we call functional integral procedure in QFT being ''quantization'' procedure.Because the integration is the ''summing up'' procedure,but not ''dividing'' into ''quantum'' procedure.Or does this term(quantization) has a origin of being able to...

So I am wanting to start applying for PhDs for entry in Sept/Oct 2012, I graduated from Uni last year so I don't really have any guidance on this! I do have a good idea of what I want to apply to do, and have a list of places I would like to apply (saving this for another thread haha :) )...

Homework Statement The four functions v0 = 1; v1 = t; v2 = t^2; v3 = t^3 form a basis for the vector space of polynomials of degree 3. Apply the Gram-Schmidt procedure to find an orthonormal basis with respect to the inner product: < f ; g >= (1/2)\int 1-1 f(t)g(t) dtHomework Equations ui =...

Hi fellow physicists, I'd like to create my own website. I already have my own webpages currently hosted on a university server but my account will soon be deactivated and I will no longer be able to use that server. So I would like to transfer my personal webpages elsewhere. The trouble is...

Fortran95 HELP! Hi everyone, I have problem with writing a procedure in Fortran. I'm a newbie so any help will be appreciated. So the problem is as follow: I have written a program which reads some data from input file and then calculates some stuff using read values. Now what i have to do...

Here's what I have >Integral:=proc(f,i) local JExact,S,R,E; JExact:=int(f,x=0..1); S:=rightsum(f,x=0..1,i); R:=evalf(%); E:=evalf(abs(JExact-R)); RETURN( [Integral]=JExact, [Right_Sum]=S, [Right_Sum_Eval]=R, [Error]=E ); end; Integral...

Homework Statement The first part of the problem is just finding the Lagrangian for a system with 2 d.o.f. and using small angle approximations to get the Lagrangian in canonical/quadratic form, not a problem. I am given numerical values for mass, spring constants, etc. and am told to find the...

Hey guys, What method[s] do astronomers use to count the stars in the galaxy to come up with a number ?

Locally, Fermi normal coordinates are designed to correspond with direct measurement of distances (born rigidity). I also discovered that Synge's book on GR establishes that very locally, radar distance must match Fermi normal distance, but not in general (obviously). What I am wondering is...

Homework Statement Please see attachment. I really need someone to check this properly please- I know this is meant to help people but checking this would be a huge help to me since its worth marks...(Ive done all the work) THANKS A LOT to anyone who helps.. Homework Equations...

could you please explain how to synchronize an incoming alternator with running system.I heard about ''dark lamp" or 'bright' method.But what actually the process is?

Homework Statement The damage caused by electric shock depends on the current flowing through the body; 1 mA can be felt and 5 mA is painful. Above 15 mA, a person loses muscle control, and 70 mA can be fatal. A person with dry skin has a resistance from one arm to the other of about 1.1 ×...

Homework Statement A cylindrical can is to hold 4π cubic units of juice. The cost per square unit of constructing the metal top and the bottom is twice the cost of constructing the cardboard side. what are the dimensions of least expensive can? calculus must be used logically to solve this...

Homework Statement We consider P2 the vector space of all real polynomials of degree at most 2. <f,g> = f(-1)g(-1)+f(0)g(0)+f(1)g(1) Use the Gram-Schmidt procedure to construct an orthonormal basis for P2 from the basis {1,t,t2} Homework Equations...

word problem-Please help me to check my procedure Homework Statement A cubical ice block is melting at a rate that relates to its surface area. Set up an equation for the volume of a cube, C, in terms of its surface area, S. Homework Equations C=x^3 S=6x^2 The Attempt at a...

Hello. I need help with understanding one part of the convolution procedure. This doesn't involve any particular homework problem, but I'll use the following problem as an example: http://img34.imageshack.us/i/tempuf.jpg/ I have 2 questions. If anybody can help me, I would greatly...

Homework Statement I have a query - regarding the procedure to test pole. As attached. pse find. so, z is not a pole but a Removable Singularity? NEXT, if z is not a pole (which is true for above) - no point testing for the order of the pole right? Homework Equations The...

Homework Statement I have a question - just to check when we know the whole function is not analytic at some point of z. We can use cauchy integral formula of 2*pi*j*f(a) to find the answer. In between; one of such method is to use Partial Fraction to break up the rational functions. So...

Homework Statement Test for pole procedure. As attached powerpoint. Pse advise. Homework Equations The Attempt at a Solution

Hello, I would like to know how the lattice diffusion is done & why is it temperature dependent? I have tried googling Lattice diffusion several times, but I couldn't find any complete online reading/video... Your contributions will be highly appreciated.

How can I prepare NaIO4 in large amounts (cca 100 Kg). Procedure with chlorine is not acceptable.

we know that at temperature above 0K, in semiconductor some electron collecting sufficient energy fron surroundings to cross the band gap, placed in the conduction band. But what's the actual procedure to make the transition. I mean to say is it direct absorption of IR photons or by some other...

The idea is that you have a clock at the origin of some frame O. In order to synchronize this clock with 2 other clocks placed at x = -X and x = X (one dimensional) these two clocks are fixed to show the time t = x/c and they start ticking when they receive a light flash from when the clock at...

I was "Jenab" who wrote the "Transfer Orbits for Dummies: A Hillbilly Tutorial" that was stickied in this forum. I've written an improved procedure. The main improvements are: 1. A more straightforward calculation of the true anomaly at the non-apsidal endpoint of the intended trajectory...

Homework Statement Ok...Hopefully someone can help me here... I have to make up a procedure to prove how F=ma using a Kick Dis(http://www.smarthome.com/9563.html) We need to list materials and write a decent procedure Homework Equations Kick Dis is 7.5" in diameter Kick Dis weighs 1.8...

For this question: http://tinyurl.com/294gl5 I am doing in this way: [1] calculate the kinetic energy before(1/2*m1*u1 + 1/2*m2*u2) [2] use the conservation of momentum to calculate the velocity after(v=(m1u1+m2u2)/(m1+m2)) [3] calculate the kinetic energy after(1/2*(m1+m2)*v) this way we can...

Hi, I need help for 3 questions 1) Describe qualitatively the procedure for calibrating the force probe. 2) when determining the acceleration over a timeinterval, LoggerPro provides the following statistics : Average 0.107 Standard Deviation 0.120 Number of Points 54...

Kindly recommend a procedure to determine total kjeldahl-nitrogen Kj-N for leachate. I use the hach method and I want to compare it with another one especially that I'm participating in a universal proficiency test. Thanks in advence.

Because Trigonometry is a pre-requisite for Calculus, the purpose of this procedure is for use in 'calculator banned' Calculus courses, to eliminate the requirement of memorizing sixteen 'special angles' in Trigonometry to derive the correct solution. Memorizing this procedure can produce all...

Im attempting to make a distillation procedure with tap water so that i can drink it pure. I got a small can of pvc primer, i emptied it, and scrubbed it clean as best i could. Its sitting on a stop top right now getting as hot as it can possibly get so that all of the alcohols will evaporate...

Having a problem with a procedure the procedure is > proc1:=proc(f,a,b,xmin,xmax) > local locallist; > locallist:=[seq(rhs(f),_C1=a..b)]; > RETURN(locallist); > end; the test function I am using for f is DE_soln = y(x) = (arctan(x)+_C1)/(1+x^2)^2; Which I got from using the...

Hey guys i have a problem that the "geniuses" at overclock.net don't seem to have a clue about :D When I am done playing a game or sometimes when i alt-tab out of a game, my system slows down a whole lot. I check and in my task manager (xp), "System" is showing CPU usage of 30-90%. I then...

I had this idea this morning and was going to make another "figure-out-the-sequence" out of it, until it occurred to me that it was slightly more interesting than that. Consider the following procedure: start a line with 0 2, and add on additional numbers as you please so long as the...

I've been trying to figure out how to calculate the exact area of a ruled surface. I think I've come to a solution that works, but I'm not sure it's totally accurate. The procedure is as follows: Consider two curves. A ruled surface is constructed by connecting each point on one curve to a...

Can someone solve this equation and write the procedure? x+cos(x)=0 Without using graph.

Here is my problem: I got A right, but B is wrong... Can point out what I'm doing wrong? Thanks! Develop a Mathematica procedure to find 5 roots of the following equations. a.) x^5 + 5x^4 + 4x^3 + 3x^2 + 2x + 1 = 0 b.) e^x sin^2 x - cos x = 0 For part A, I got NSolve[x^5 + 5x^4 +...

A large tank of water has a hose connected to it. The tank is sealed at the top and has compressed air between the water surface and the top. When the water height h has the value 3.5 m , the absolute pressure p of the compressed air is 4.20 * 10^5 Pa. Assume that the air above the water...