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 Mar 11 comment Proof that flux through a surface is independent of the inner objects' arrangement I'm happy that the divergence theorem holds for general surfaces, but not $\nabla \cdot \mathbf{g}= - \rho G 4 \pi$ that needs to be put into the divergence theorem to get Gauss' Law. Mar 11 revised Proof that flux through a surface is independent of the inner objects' arrangement added 350 characters in body Mar 11 revised Proof that flux through a surface is independent of the inner objects' arrangement added 149 characters in body 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.