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11h
comment Movement of a cylinder filled with water
Awesome, I once studied this case for a course (long ago). Then I analyzed it one an incline, hitting a wall at the bottom. It will 'reflect' in a funny way (with a delay).
15h
comment Forces while squeezing a toothpaste tube
@KyleKanos Of course, but how can one prove/demonstrate that?
20h
comment Forces while squeezing a toothpaste tube
Why are you neglecting $\nabla p$?
2d
comment How to determine your position underground?
@ChrisWhite But, if you want to now your depth wrt the local surface, wouldn't that fall within any magnitude of the error that you can obtain with this method?
2d
comment What circle aids/tools are there where angles are doubled?
You might want to ask this on math.stackexchange, but you need to think about the formulation there for it to be on topic. Please read their FAQ to check.
Sep
10
comment Formula for Electrical Arc Length
I see your point, but in that case, don't answer, but leave it as a comment, downvote the question, and flag it for closing. That is the way it should work on SE.
Sep
9
comment Hoop rolling inside a circular hole
It would help to put the sketch in your question. People generally do not like to follow links.
Sep
9
comment Does one really need classical physics in order to understand quantum physics?
Yes, you need it. Because you need to learn the way physicists think. That is different from the way mathematicians think.
Sep
8
comment A problem says : a car starts from rest and undergoes a constant acceleration. It travels 5 m in the…?
This might be a duplicate: What is the intuition behind $gt^2/2$ equalling the distance something falls after $t$ seconds?
Sep
8
comment How much energy is needed to heat your body in water?
@JohnRennie For fat people the sphere approximation is better, which is good :)
Sep
7
comment Autocorrelation function for deterministic nonlinear dynamical systems
The autocorrelation you show looks a bit weird to me. I would expect it to be maximum at $\tau=0$ (by definition) and periodic with the same period of your $x$. Also, didn't you mean to write $\dfrac{d\mathbf{x}}{dt}$ in your equation?
Sep
7
comment Why does this perpetuum mobile not work?(Gases and Densities)
possible duplicate of What is the fallacy in this infinite motion machine?
Sep
7
comment Formula for Electrical Arc Length
Basically this is a link-only answer. Would you consider adding a few more details in your post? Otherwise it is only valuable as a comment rather than an answer.
Sep
7
comment When sliding down steep hill, is it safer to go down back or front against the hill?
I think it is more important whether you are going head first or not.
Sep
7
comment Definition of entropy in nonequilibrium states
@LarsMilz I hope you can expand your comment to an answer? It contains it pretty much :)
Sep
6
comment Hoop rolling inside a circular hole
Did you make a sketch of the situation? Or is it supplied with the question?
Sep
5
comment Conservation laws and continuity equations
I don't really understand what you mean with "quantity teleportation". Also, do you have a specific field in mind?
Sep
5
comment Conservation laws and continuity equations
1. Do you know about flux? And how it comes into these kind of equations? 2. I would say, focus on the physical meaning of the terms in the equations, rather than the equation itself.
Sep
5
comment Should a pen be light or heavy?
@ROIMaison I think that only starts to play a role for a pen heavier than hand+wrist+arm.
Sep
5
comment How come the atmosphere moves with Earth?
Also: physics.stackexchange.com/q/66053