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Currently I am working on a problem whereby I need to solve numerically the propagation of waves in water. My past experiences with this problem is to use the Helmholtz...
Asked on 03/01/2021 by CJK
2 answerAs a sealed mylar foil balloon ages, it deflates. I assume that this is mostly due to the monoatomic helium escaping through the envelope material. (In much the same manner...
Asked on 03/01/2021 by CoilKid
1 answerIn Peskin's book, he first tackled massless $phi^4$ theory, its renormalization, namely the Callan-Symanzic equation when m=0. And then he put the mass term in later and approach this...
Asked on 03/01/2021 by hehehehehehe
0 answerThe Clausius statement of the second law of thermodynamics says that heat flows from a hotter body to a colder body. Heat can flow in many different mechanisms. In the...
Asked on 03/01/2021
2 answerIn QCD, and more generally in representations of $mathfrak{su}(N)$, there is a freedom to choose the normalisation of the generators,$$mathrm{Tr} , left[R(T^a) R(T^b)right] = T_R delta^{ab}.tag{1}...
Asked on 03/01/2021
2 answerThe following question was put on hold: Is it possible to prove that an elephant and a human could jump to the same height? It reminded me of an...
Asked on 03/01/2021
6 answerWhen something floats, it is due to the buoyant force from the liquid onto the object, but what force does the object exert in response down on the liquid? I...
Asked on 03/01/2021
3 answerThe question is simple. We know induced emf in a conducting loop due to a changing flux is given by $$ E = -frac{dPhi}{dt} $$ My question is if...
Asked on 03/01/2021
2 answerWhy $H$'s radial component in a solenoid filled with linear magnetic material is zero? Unlike $B$ where we can use the Biot-Savart law to say that reversing the...
Asked on 03/01/2021
0 answerSuppose we have time independent one-dimensional single particle Schrödinger-like equation$$-frac{d}{dx}left(Aleft(xright)frac{d}{dx}psileft(xright)right)+Vleft(xright)psileft(xright)=Epsileft(xright),$$where $Aleft(xright)$ is a positive function. We have guessed an eigenfunction $psi_{mathrm{guess}}left(xright)$ of energy $E_{mathrm{guess}}$, and...
Asked on 03/01/2021
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