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First law of thermodynamics, the conservation of energy, doesn't this law all but guarantee that regardless of how far the universe expands it will forever contain its original amount of...
Asked on 02/15/2021 by Brando
1 answerFanno flows are a very interesting phenomenon in fluid dynamics: the flow (steady, 1D, adiabatic) is moving in a pipe where friction forces are not negligible. Due to the second...
Asked on 02/15/2021 by Avles Edivad
0 answerWe can prove that enthalpy is equivalent to the heat $q$ for constant pressure process by the following derivation: $$ d H = dU + d (PV)$$ Or,...
Asked on 02/15/2021
0 answerI was working on physics homework and came across this multiple choice question.Two metal plates of area A and separated by a distance d are placed in parallel near...
Asked on 02/15/2021
1 answerI will be speaking very loosely since I am not a physicist. Say a system evolves via a dissipative force, then usually as time moves on some energy functional will...
Asked on 02/15/2021
0 answerI'm currently reading/studying the FLP and I have a question regarding waves. In a chapter about QM, Feynman says that any short wave train doesn't have a definite wavelength. I...
Asked on 02/15/2021 by Lgallego
3 answerConsider a spherical capacitor which is made of two concentric spherical shells. The capacitor is charged so that outer shell carries a positive charge and the inner shell carries a...
Asked on 02/15/2021
1 answerI'm interested in a frame bundle over spacetimes with different topologies. In the trivial case of Minkowskian space ($mathbb{R}^{3,1}$), a frame (or tangent space) at one point is going...
Asked on 02/15/2021 by R. Rankin
1 answerWe often use diffeomorphisms to change coordinates on a smooth manifold $(M,A)$. But, from what I've seen, "changing coordinate" is simply a function $psicircphi^{-1}$, where $phi$ and...
Asked on 02/15/2021 by xpsf
1 answerWhy Coulomb's Law is only valid for point charges? Is there any reason? Why this law is not valid for other charges rather than point charges?...
Asked on 02/15/2021 by Sajawal
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