Recent content by Ragnar

Given a vector field (4x+2x^3z)i-y(x^2 +y^2)j -(3x^2z^2 +4y^2z)k which closed surface has the greatest flux. I imagine that the divergence theorem palys a role but I'm not sure. please anwer ! This is killing me!

Could someone tell me what the tensor product is and give an example?

Oh ok i get it now. darn I'm stupid.

but why do they still apply? is it because of the postulate that says that all the laws of physics are the same in all inertial frames?

THen wouldn't that mean that time dilation and therefore all relativistic effects only apply in vacuum? i mean since the speed of light is not the same to all observers in non vacuum.

Why is the c in the the time dilation formula have the be the speed of light in a vacuum and not the one in the medium through which an observer sees it move? Say for example we do that thought experiment used to derive the formula, in a much denser medium(in which the speed of light is...

How do we prove that the spacetime interval is invariant? Also why is it so important?

I suppose. Yes I can.

Are there any good online quantum mechanics intros?

Could someone explain why the principle of least action is true?

This is a very stupid question. extremely stupid. In fact I'm extremely embarassed. I was reading a text on electromagnetism, and it said that since the flux due to a charge does not depend on the radius of the sphere then the formula, q/permitivitty applies to all closed surfaces. This is...

How do we derive the metric tensor?

Is schaum's, tensor calculus outline a good introduction to the basics of the subject? I'm looking for something that isn't too formal and purely elementary.

So I've narrowed it down to sean caroll's and d'inverno's. How much do each cover?

I've read some of the mathematical portions of shcutuz and siliked it for it's lack of rigour.