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One of the fun tidbits that gets bandied around in physics departments is that the Mississippi River actually flows away from the center of the Earth. Due to the...
Asked on 08/13/2020
2 answerI'm solving this particular question (refer to image) in which a rod is released from equilibrium after one of the two springs to which it is initially connected is disconnected....
Asked on 08/13/2020 by sidsr003
1 answerThe lorentz transformation matrix (for all 3 spatial axes, not just a single dimension boost) appears to be commonly defined as the following:$$begin{bmatrix} gamma ...
Asked on 08/13/2020
1 answerI am searching for a way to calculate the potential on the surface of two perfect conductors that are spheres. I am not sure my method is correct. Here is...
Asked on 08/13/2020
1 answerSo as I was taking a test today I encountered an intriguing question, the question came in two parts. The first parts, which I answered quite easily, was about whether...
Asked on 08/12/2020 by Jerry Wu
3 answerI'm trying to get the expected value as a function of time for the position, of a harmonic oscillator hamiltonian and a state vector $|psirangle=a|0rangle+b|2rangle$. I have$$|psi(t)rangle=ae^{-frac{iomega...
Asked on 08/12/2020
3 answerThis question is a spin-off from this related question: Why does the Born approximation for the scattering amplitude depend on the potential $V$ everywhere in space, unlike...
Asked on 08/12/2020 by jesseylin
2 answerSuppose I have a little mass m resting on a big slab mass M resting on a table. There is a frictional force between the little mass and the slab,...
Asked on 08/12/2020 by Meep
2 answerConsider the equilibrium time ordered and retarded Green's function for two operators $A,B$, defined as follows$$G^T(t,t') equiv -ilangle T A(t)B(t') rangle=-itheta(t-t')langle A(t)B(t')rangle -itheta(t'-t)langle B(t')A(t)rangleG^R(t,t') equiv...
Asked on 08/12/2020 by user1830663
3 answerI found Sean Carroll's "A No Nonsense Introduction to General Relativity" (about page here. pdf here), a 24-page overview of the topic, very helpful for...
Asked on 08/11/2020
6 answerGet help from others!
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