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Consider the question from this post where I had asked about a scenario where a pendulum was attached to the roof of a car and I wished to understand...
Asked on 01/12/2021
2 answerI'm trying to understand Wikipedia's derivation of the isentropic velocity-area relationship, here under "Flow analysis": https://en.wikipedia.org/wiki/Isentropic_nozzle_flow I don't quite understand what happens to the energy equation. I...
Asked on 01/12/2021
1 answerThe multiplicity (m) of lattice planes counts the number of planes related to (hkl) by symmetry. For example, the multiplicity of the {100} planes would be 6 because the following...
Asked on 01/12/2021 by Joseph Knight
1 answerImagine a DC circuit with small but non-zero resistance in wires and large resistance in a single resistor in series with the battery, all ohmic. Connecting the battery I imagine...
Asked on 01/12/2021
2 answerThe question is quite fundamental and more on a beginner's level (not sure if good in this high-level-forum, but I try): I have big problems in understanding the stress tensor...
Asked on 01/11/2021
1 answerI am confused about how Peskin & Schroeder derive the matrix (21.39):begin{equation}gF^a_{ i}=frac{v}{2} left(begin{array}{ccc}g & 0 & 00 & g & 00 &...
Asked on 01/11/2021
1 answerI was wondering that relative velocity can be computed easily due its directional nature.but what about speed?Speed is not directional so now we cant find relative speed of...
Asked on 01/11/2021 by Srijan Suryansh
1 answerI have the following confusion with Maxwell's demon thought experiment and its resolution. According to this thought experiment, when the demon's memory space becomes completely full, it erases information, and...
Asked on 01/11/2021
1 answerNormally I don't care about units in the derivations on relativity or QM. Just set $hbar = c = 1$. But learning about the energy momentum tensor for the...
Asked on 01/11/2021
2 answerGiven an $N$-level quantum system with computational basis ${|1> ,|2> , cdots, |N> }$, if we perform an unitary operation $U$ on a computational basis state ${|j> }$ and then...
Asked on 01/11/2021 by Guldam
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