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At what speed does wind generate warming of an object? Say I'm outside at 0°F. How fast does the wind have to be to raise my exposed skin temperature to...
Asked on 07/29/2021 by Peter J. Fotopoulos
1 answerIn all lectures, books and papers I have read about, the scale factor of the universe is inversely proportional to temperature $$a propto frac{1}{T}$$ What is the reasoning behind this...
Asked on 07/29/2021 by Cheeku
1 answerSuppose a ball is undergoing vertical circular motion while being tied to a fixed point with a string. Denote the angle of the string with the vertical as $theta$...
Asked on 07/29/2021
1 answerSuppose one has a funfbein $e^a_{mu}$ with associated spin connection $omega^mu_{,ab}$. Writing this in terms of differential forms,$$e_a:=e_a^{mu}mathrm{d}x^{mu}, omega_{ab}:=omega^mu_{,ab}mathrm{d}x^{mu}$$the Riemann tensor$$R^a_{...
Asked on 07/29/2021
0 answerMy question is that, we all know the three equations of straight line motion under constant acceleration, begin{align}x & =x_{rm o}+v_{rm o},t+tfrac12 mathrm a,t^2tag{1d-a}label{1d-a}v & =v_{rm...
Asked on 07/29/2021 by Sohaib Ali Alburihy
2 answerIn David McIntyre's Quantum Mechanics, we examine an electron within a magnetic field$$vec{B}=B_o hat{z}+B_1[cos(omega t)hat{x}+sin(omega t)hat{y}]$$The Hamiltonian is then time-dependent and in matrix form it is as...
Asked on 07/29/2021
1 answerI've light traveling through three mediums, so the snell law would be $$n_1sin{theta_1}=n_2sin{theta_2}=n_3sin{theta_3}$$ Suppose that I work with the first and the last equation$$n_1sin{theta_1}=n_3sin{theta_3}$$ The point I'm...
Asked on 07/29/2021 by Ja_cpp
2 answerI am high school student and I am really confused about how black body radiation or radiation from any general body works? Suppose we are observing the color of any...
Asked on 07/29/2021
4 answerIn Kolb and Turner's book, it is given that if the chemical potential of the fermionic species if not taken to be neglible then the excess fermion number density is...
Asked on 07/29/2021 by Dark Vader
0 answerIn the deconfined quantum criticality literatures like https://doi.org/10.1103/PhysRevX.9.041037, some equations are usually given: $$SO(3)times Z_{4}to SO(5),U(1)times Z_{4}to O(4),SO(3)times Z_2 to O(4),$$but how to derive such...
Asked on 07/29/2021
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