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This is an attempt to gather together the various questions about time that have been asked on this site and provide a single set of hopefully authoritative answers. Specifically we...
Asked on 01/10/2021 by John Rennie
9 answerSo I have a very complicated Hamiltonian given by: $$ H_R(psi, P_psi) = frac{-B_0 R^3}{2 pi} (2 psi - sin(2 psi) + sqrt{B_0^6 R^6 V(psi)^2 - P_psi^2} $$ where...
Asked on 01/10/2021 by Johan Hansen
1 answerI was chatting with my kids about how incandescent lightbulbs work, clarifying that they don't so much "burn very slowly" (their original understanding) so much as they emit photons "just...
Asked on 01/10/2021 by natevw
1 answerVariational approximationVariational methods are an important technique, frequently applied for the approximation of complicated probability distributions, with the applications in statistical physics and data science. Suppose we have some complicated...
Asked on 01/10/2021 by spiridon_the_sun_rotator
0 answerA non-trivial result from studying the classical mechanics of an extended object shows that rotation about an axis whose moment of inertia is between the largest and smallest moment-of-inertia axes...
Asked on 01/10/2021 by KF Gauss
2 answerIt would be really nice to see how Jackson got eqn 5.33 on his example problem for finding the vector potential of a circular current loop $$J_{phi}=Isintheta'delta(costheta')frac{delta(r'-a)}{a}$$ for...
Asked on 01/10/2021
5 answerFor single-stage (ie one pump) water transfers calculations for pressure loss are commonly done by adding the elevation difference of the start and end of the pipeline to the friction...
Asked on 01/10/2021 by user6784
1 answerDoes anyone have an explicit closed-form expression for the wavefunction of a single photon from a multipolar source propagating through free space? Any basis is acceptable as long as it...
Asked on 01/10/2021
3 answerAccording to my physics book, one can use the following laws to identity the magnetic field: div B = 0 rot B = μ0J My book also states that, given...
Asked on 01/10/2021
1 answerI am just reviewing Fresnel's equations where Reflectance $R$ is equal to $$R=|r|^2$$ where $r$ is the complex reflection coefficient. Is there an equation that relates ...
Asked on 01/10/2021 by MathHelper123
1 answerGet help from others!
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