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seen Dec 16 at 0:14

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?
Jan
19
comment How much effect does the Bernoulli effect have on lift?
Thank you! Maybe include that in the answer?