TSny's latest activity

YouTube is your friend (with music)! CLick here. Interesting point. I think the diagram captures the main effect – the re-routing of...

Perhaps, but I don't think so. The real force in this case is static friction which adjusts itself to provide the observed acceleration...

From ##t = \alpha \sinh(\tau/\alpha)##, we have ##z = (t^2 + \alpha^2)^{1/2} = \alpha \cosh(\tau/\alpha)##. Use these to express the...

Yes, the Coriolis force is toward the right. In the video below, you can see that when the rotating frame rotates counterclockwise...

Thanks to your nice drawing it is clear what's what. To @brotherbobby: The cross product vector ##\mathbf {\Omega}_0\times \mathbf...

Yes, I agree that the x-axis as drawn is bad. The x-axis (toward the east) should be into the page (perpendicular to the y-z plane)...

Your work looks correct to me (except, as pointed out by @kuruman, ##m## should not be in your expression for the acceleration). I...

Looks good. Recall @haruspex 's comment: If the charge, ##-q##, on the inner surface were uniformly spread, what would the potential...

Thank you for the update Robert, and I'm very sorry for the loss to you and your family. Paul was an amazing member here, with many...

damn. this is hard to hear. @phinds was just a loved and core member for 15 years. Thank you so much for taking a bit of time to let us...

Good afternoon, This is not Paul, but rather his son Robert. I am very sad to write here that my dad passed away on Saturday...

Using the wedge product (bi-vector) instead of the cross product (pseudo-vector) avoids the issues pseudo-vectors have under mirror...

I'm not familiar with any treatments of thermodynamics that prove differentiability of ##U##. I think physicists tend not to worry too...

Even though we need quantum mechanics to describe atoms, we still assume that systems of atoms have well-defined energies and that the...

I think Callen’s conclusion follows from his discussions earlier in Chapter 1. The change in the internal energy of a system during a...