Recent content by montreal1775

Could an admin please move this thread to the Astrophysics section? I think it might be better suited there. Thanks!

Hi all, In looking at the first law of black hole mechanics, I can see the immediate analogy between surface gravity and temperature, black hole mass and energy, and area and entropy. But is there any meaningful analogy between pressure and spin, and volume and angular momentum? Thanks for...

Thanks for both recommendations. Winitzki's introduction seems like it gives a good overview. The Poisson text is too advanced for me though.

Does anyone know of any good books, papers, articles, or any other resource that discuss the thermodynamics (history of, theory, current research, etc.) of black holes? Preferably something at the advanced undergraduate level. Thanks for any advice!

Oh, right. Stupid mistake. Thanks a lot!

Thanks for the reply. Sorry, I should have mentioned the next part of the question was to calculate the time between adjacent guns firing in the rod's frame. With v=sqrt(3)*c/2, I found the time difference to be -1/sqrt(3) *10^-9 s, which matches the solutions. I'm having trouble finding the...

But isn't the 1 meter distance the proper length? Since all the guns fire simultaneously in the lab frame, isn't the measured 1 meter the proper length? If so, I don't see how the distance could be measured to be greater than 1 meter in the rod frame. Even if this isn't the case, why do I get...

Homework Statement This is actually an exam problem, not a homework problem. The solution have been posted, but I don't understand the solution. Here is the question, as posted: A very long rod travels parallel and very close to a flat surface in our laboratory. The surface contains...

Homework Statement A large, cylindrical roll of paper of initial radius R lies on a long, horizontal surface with the open end of the paper nailed to the surface. The roll is given a slight shove (initial velocity is negligible) and begins to unroll. Determine the speed of the center of mass...

So is I = \rho \iiint_{0}^{L} x^2+y^2+z^2 \,dxdydz the rotational inertial of a cube rotated about a corner?

Also, Ja4Coltrane, I don't understand what you mean. Could you please elaborate?

So would it be I = \iiint_{0}^{L} x^2+y^2+z^2 \,dxdydz where L is the length of a side?

I=integral(r^2,m) but then what do I do? I'd use the parallel axis theorem but I don't know how to find the rotational inertia for a cube about it's center of mass.

Does anyone know what the rotational inertia of a cube of uniform density is when it is rotated about an edge? Any help is appreciated!