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seen May 2 at 18:08

Mar
11
comment Proof that flux through a surface is independent of the inner objects' arrangement
@joshphysics I hope it's clearer now, and yes, that was what I was looking for.
Mar
11
comment Proof that flux through a surface is independent of the inner objects' arrangement
Sorry about that, Poisson's equation was more of a sidenote rather than the main part of the question: I was referring to its use in the proof of Gauss' law.
Mar
11
revised Proof that flux through a surface is independent of the inner objects' arrangement
Made clearer
Mar
10
asked Proof that flux through a surface is independent of the inner objects' arrangement
Mar
10
comment Can an orbit be calculated using two points and transit time?
Counterexample: you can come up with an ellipse or a parabola that passes through two points in the same times.
Mar
9
accepted Relation between satellites' potential energy and quantum mechanical confinement energy?
Mar
9
comment Relation between satellites' potential energy and quantum mechanical confinement energy?
I got the equation from Cheng and Warner's (excellent but) fairly non-rigorous introduction to QM, so your answer's much appreciated. Thank you!
Mar
9
comment Relation between satellites' potential energy and quantum mechanical confinement energy?
I did guess that it was probably integer multiples of $\hbar$ (although, yes, it's not true unless $l^2+l$ is a perfect square).
Mar
9
asked Relation between satellites' potential energy and quantum mechanical confinement energy?
Mar
4
comment Does a ball thrown in the air really stop at its apex, and if it does, wouldn't that violate the uncertainty principle?
Experts only ever state this as an approximation.
Feb
2
comment Why does 'proper length' exist as a notion?
Thanks for the edit. It reminded me that there's no smooth transition between proper length and time. The discontinuity itself is enough to abandon dreams of unification.
Feb
2
accepted Why does 'proper length' exist as a notion?
Feb
2
revised Why does 'proper length' exist as a notion?
deleted 1 characters in body
Feb
2
revised Why does 'proper length' exist as a notion?
deleted 1 characters in body
Feb
2
asked Why does 'proper length' exist as a notion?
Jan
30
awarded  Citizen Patrol
Jan
22
comment Shape of a string/chain/cable/rope/wire?
I think I understand now- I made a mistake having the integral within the integral.
Jan
22
comment Shape of a string/chain/cable/rope/wire?
And also I'm getting stuck on differentiating $\int_0^l ds$ with respect to $\dot{h}$.
Jan
22
comment Shape of a string/chain/cable/rope/wire?
@nervxxx, as a sanity check, is $\lambda= \frac{g \rho}{l}$ correct?
Jan
19
accepted How much effect does the Bernoulli effect have on lift?