Recent content by IDumb

I assume so. That's the justification for removing the displacement current term at least. He says a "General complex conductivity" though... Which contradicts that.

Hi all, I'm working through chapter 2 of Michael Tinkham's Introduction to Superconductivity. On page 40, he asserts that the skin-depth for a general complex conductivity is (In Gaussian units) $$\delta = \frac{c}{\sqrt{2\pi\omega\left(|\sigma| + \sigma_2\right)}}$$ where $$\sigma = \sigma_1...

Thanks for the response! So I have gotten the velocity but I have a question about it. So at t' = 0, we have *dt = gamma*(v*dx'/c^2). Then we say dx = gamma*dx' at t' = 0. So at t' = 0 we have dx/dt = c^2/v. I'm having trouble... figuring out what "velocity of the flash" is. I don't really...

Homework Statement Consider the usual two inertial frames S and S' in standard configuration. In S' the standard lattice clocks all emit a 'flash' at noon. Prove that in S this flash occurs on a plane orthogonal to the x-axis and traveling in the positive x-direction at (de-Broglie-) speed...

Hi, I graduated undergrad in December, and plan to start grad school in the Fall. In the off semester, I thought it would be fun to try to teach myself special/general relativity because my undergrad didn't really do it. I have looked at a few books, and I have really liked the explanations...

I have absolutely NO IDEA what d is asking or how to do e. A and B are simple, i used the formula E = hbar^2(l(l+1) / 2I (I is moment of inertia) to get c. Can anyone help me with D and E please? Consider the model of a diatomic gas fluorine (F2) shown in Figure 9.3. (Figure is 2 atoms...

Homework Statement Find the force necessary to give a proton an acceleration of 4.0 1019 m/s2 when the proton has the following velocities (along the same direction as the force). We're covering special relativity and due to my lack of a brain I can't figure this simple problem out...

I came across this problem in a story I was reading. I thought it would be easy... but I am having a great deal of trouble. The story claims that physicist David Bohm was asked the question: if a person of height h stands on ground and holds their head at an angle theta relative to ground...

That's the issue. At h = 0 it simplifies easily. I get a messy equation for D with respect to theta. Leading to stupid mistakes when taking the derivative to find the critical points. I used a computer to solve what I had, and I got angles that varied with both height and the magnitude of...

meh, sorry, had some issues posting it must have gotten deleted. I subbed in vx = v0cos(\theta) and vy = v0sin(\theta). Then i took dD/d\theta. Set it = 0, used a computer to solve it.

1) This is not a homework problem, just a question I came across and can't solve adequately. 2) Sorry if this is wrong area to post it. Homework Statement What angle would be best to hold your head at relative to ground to maximize the distance you can spit. The Attempt at a Solution I drew...

Homework Statement Let A be an n x n matrix and let x and y be vectors in R^n. Show that if Ax = Ay and x \neq y, then the matrix A must be singular.Homework Equations So far we have learned the definition of a matrix that has an inverse to be one where: if there exists a matrix B and AB = BA...

Hey guys, I have my physics final tomorrow and I have this simple question from a practice exam. I have gotten the correct answer by using the momentum principal, but when I try to check my work using the energy principal I get twice the correct answer. So I would appreciate it if you guys...