Recent content by Fr33Fa11

I just solved it last night. The delta function approach doesn't produce the correct answer; F(n)=lambda/(2pi*n*epsilon_0) (sorry I'm not sure how to embed latex into the forums). I found this by manipulating the infinite series for the field a distance a directly above one of the wires into a...

In the Feynman Lectures, Volume II, Chapter 7, the final two pages (7-10 and 7-11), Feynman describes an infinite array of parallel charged wires and uses a Fourier series to solve for the field above them. He shows that the series can be expressed entirely in terms of cosine terms and that the...

Ok, I think I understand it. I found an explanation using two resistors in series and standing voltage waves. What I don't understand now is his derivation of P from the spectral distribution for a black body radiator. As far as I understand it, he says this: 1. The black body radiator can be...

I've been reading through the Feynman lectures (almost done with Volume 1), and I have been trying to prove everything to myself. I have a bit of a problem now though, in Chapter 41 on Brownian motion, Feynman shows what the voltage in an LRC circuit is due to thermal noise, and then says that...

Is magnetism based on the relative velocities of the charges? Would two charges moving in the same direction at the same speed have a magnetic force between them?

I thought that it was a product somehow of the electric field, not its own, separate force, this is what confused me.

My physics book says that the magnetic field is caused by moving electrical charges, acts only on charges with a motion vector perpendicular to itself, and the force it exerts on a charge is proportional to the velocity of the charge. How does the moving charge cause this force, which does not...

They did not arrive at a fully solved solution. I'm also trying to solve it for any number of dimensions.(Where GM/r^(n-1)) is the formula for gravitational acceleration with any number of dimensions.

I was expecting that something like this would have been done before. Do you have a link to the paper/post where it was solved, I want to see if they have a faster way of solving it, because my work is kind of messy, as is the answer.

I've solved it, and I have calculated the constants that come out of the problem. Do you know if this has been done(it would be really cool if it hasn't)

sure, f(g(x))'=f'(g(x))g'(x) Ok, so far I am following you. The expression rewrites the second derivative of position(acceleration) as the first derivative of position(velocity) times the derivative of velocity with respect to position. Using gravitational potential energy I have figured out...

I'm not sure I understand why that is true. Is v(x) velocity with respect to x, where x is distance traveled? Is v(x) just an arbitrary name for a function which fits the relationship?

I have been trying to calculate the time it takes for an object of negligible mass to free fall towards an object with a large mass, taking into account that the gravitational acceleration experienced by the small object increases as it moves closer to the big object. The first thing I tried...