Recent content by gnulinger

Do plot your data or the DFT against 1/k?

Part of the problem is that I too am unclear on this subject, so it is hard for me to ask the right questions. I was hoping that someone may have heard of something related to what I was asking about, and could have pointed me in the right direction. In the De Haas-van Alphen effect...

I am talking about the latter, and yes, I think it will be fairly involved. I have a function that is periodic in 1/k, and I am wondering if there is some way of mapping the DFT in k to that in 1/k.

Say you have some function that is periodic in a parameter k. The discrete Fourier transform from a sampling may be found in the usual way, giving the frequency spectrum in k. But what if I want to find the frequency spectrum in 1/k ? I'm not really sure what this is called, and so I've had a...

What part of this problem are you having trouble doing? The first part should be figuring out how fast the station is rotating, and then using that information and the mass of the inhabitants to calculate the angular momentum/angular kinetic energy of the ship. From there, figure out what...

For purely geometrical reasons, mgcos60 is less than mg. cepheid stated this in order to then say that the force of friction must be what's holding everything in equilibrium.

Do you think you could type up the problem description exactly as it was posted? I am having trouble picturing what this looks like.

I think you are leaving out some things in the problem statement. What is the current through the square loop?

2/3 a^2 b''[a] + (1 - w[a]) a b'[a] - (1 + w[a]) (1 - 3 c w[a]) b[a] == ?

I understand that the quantity is conserved, but I thought that the solutions manual was stating that the constant was the number "e," as opposed to just some arbitrary label of a constant. I was wondering if there was some strange math fact that led to this. Thank you for the help.

Oops. You're right. Anyway, here is the part that I don't understand (taken from the solutions manual): http://i.imgur.com/YL66F.png

Homework Statement Consider the two-dimensional spacetime with the line element dS2 = -X2dT2+dX2. Find the shapes X(T) of all timelike geodesics in this spacetime. 2. The attempt at a solution I have the solution to this problem but I don't understand one step. For timelike worldlines dS2 =...

How are you calculating the final volume of the container? Are you are using the equation for volumetric expansion of solids? I'm not sure that's right, because the container is hollow. So rather than figuring out the change in volume of a solid steel tank, try to find the change in volume of a...

You might be over-thinking this one. What is Newton's Second Law?

Your moment of inertia is wrong. For a spherical shell, the moment of inertia is I = \frac{2}{3}MR^2 Plug this into your equation, and you will get the right answer.