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I know experience-based questions are a bit tricky on this site but isn't every theory based on common experience?Every time I hear an air jetliner flying over at a...
Asked on 02/10/2021 by Deschele Schilder
2 answerI want to calculate the energy expectation value of the following state.begin{align} |Psi_{ex}rangle = hat{c}_{-k'downarrow}^dagger hat{c}_{k''uparrow}^dagger prod_{k neq k',...
Asked on 02/10/2021 by Audrique
1 answerHow do we know that the energy density of dark matter in the Universe scales as that of ordinary matter in the expanding Universe? Is it a guess?...
Asked on 02/10/2021
1 answerAs the figure shows, I have a 2D image of a conductor seen from the front. It is located a height, h1, above a grounded plane of infinite area. The...
Asked on 02/10/2021 by Jon L
2 answerAs the universe expands, the (not co-moving) distance between any two points, say the distance between galaxy A and galaxy B, increases. Assume the universe behaves the same way in...
Asked on 02/10/2021 by Miss Greenbean
1 answerSuppose we have some interacting theory with the action:$$S = int d^{D} x left(partial_mu phi partial^mu phi + V(phi)right)$$Where $V(phi)$ is a potential...
Asked on 02/10/2021
0 answerI am reading about the Carnot Engine and I understood the first 2 stages (Isothermal and Adiabatic Expansion) well. In the 3rd stage where isothermal compression takes place, the surroundings...
Asked on 02/10/2021
3 answerSuppose a 3D body had certain bending moments about the x, y, and z axes. What would the bending moments about a different coordinate system look like? In my case,...
Asked on 02/10/2021
0 answerI am learning about Maxwell's stress tensor and what I understood is that the components, say $T_{ij}$ is something like a force parallel to the $j$th-direction acting on the surface...
Asked on 02/10/2021 by Spaceman Spiff
1 answerI need to design an electromagnet for a project, and I want it to operate close to magnetic saturation. However, I don't know the saturation magnetization of the core material....
Asked on 02/10/2021 by DELTA12
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