haruspex's latest activity

The exact wording suggests that is the intention. This is reinforced by its asking for the velocity vector, not the speed. If we only...

… has to be assumed to be constant (or we do not have enough information) … an idealised mechanical system is often assumed to consist of..

And at that point, ##s=\pi/\alpha##. When will ##s## exceed that?

Enumeration problems do not, in general, fall neatly into just the two categories. See https://en.wikipedia.org/wiki/Twelvefold_way.

Consider a small patch of the inner surface. If it has charge ##\Delta Q##, what potential does that produce at A? You can use the...

Can we argue that all the field lines from the point charge must terminate at the inner surface? We need that argument anyway in order...

Your reasoning is correct and I agree with your answer. It might shed light on the problem, possibly leading to a smarter method, if you...

You can use any frame of reference you like as long as you are consistent and include "fictitious" forces as appropriate.

You wrote R3-R1 both times. What did you mean to write? I am unable to comment without seeing your whole solution. Please post a...

Very neat. Small typo: in your diagram under (1), you have -F at top right instead of F.

The Post #1 question seems to have only 20 minutes (exam’) working time advised, so a quick method is needed. There is a fairly quick...

Ah, yes, I missed that. But not if B is pinned and A is free, right?, because F acts to the right. So does this mean the two...

Happy New Year, Steve! It seems to me that, due to joints C and G, if any of the pinned-supports is replaced by a simple horizontal...

You are missing the point. There is an error in the algebra. Think about that again.

Isn’t the system statically indeterminate? [EDIT - No it isn't! See later posts.] Considering only external forces, it is trivial to...