Rick16's latest activity

Thank you, that is an interesting trick with the ratios. It is not likely that I would have thought of it. I suppose you know how to do...

This question does not seem to evoke a lot of interest. Could somebody just tell me if it is legitimate to write ##\frac{d}{d\vec...

I have begun reading Landau's Mechanics. In chapter 1, §3 he writes ##\frac {\partial L} {\partial \vec v}=const.##, where ##L## is a...

Thank you. This is it. It is not even new to me. I read about it probably more than once, but I had completely forgotten about it. This...

One more comment to show where exactly my problem lies: Potential energy is defined at a specific position. A System does not have a...

Here is the solution: The kinetic and potential energies of the system are $$U_k=2\cdot\frac{1}{2}mv^2=mv^2,~~~U_p=-\frac{Gm^2}{2r}.$$...

Here is problem 1.55 (a) from Schroeder's Thermal Physics: Consider a system of just two particles, with identical masses, orbiting in...