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What is the physics explanation for why an object with a larger base is more "stable" or more able to "balance"? For example - two pyramids, one on its tip...
Asked on 11/06/2021
2 answerWhen deriving the stefan boltzmann law from planks law. You may make a substitution (http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/stefan2.html). This substitution will lead to a stray minus sign in the equation....
Asked on 11/06/2021
1 answerThe characteristic equation is as follows: $E^2-hbar omega E -hbar^2omega^2alpha^2 = 0 $ The eigenvalues I get are $frac{hbaromega(1pmsqrt{1+4alpha^2})}{2}$, however, I am being told the solution is ...
Asked on 11/06/2021
1 answerI am reading the introduction to the textbook The Quantum Theory of Light, third edition, by Louden. When discussing the photon, the author says the following:The idea of the photon...
Asked on 11/06/2021
3 answerI'm studying structural mechanics and I have been stuck on a thought.I drew a very simple cantilever beam situation. If I make a fictional cut like in my fig.1,...
Asked on 11/06/2021
2 answerI've read in this paper (doi:10.1038/nature07871) that in the context of quantum mechanics, $rm SU(2)$ symmetry leads to the conservation of spin polarization, or in other words invariance with...
Asked on 11/06/2021 by R_A
2 answerI'm slightly confused about the placement of upper and lower indices for the transformation of a rank-2 contravariant tensor. A contravariant rank-2 tensor transforms as $$M' = Lambda M...
Asked on 11/06/2021
0 answerMy Level/Background: I have just completed my first year of undergrad. In high school, I completed AP Physics C Mechanics and Electricity and Magnetism. In my first year of undergrad,...
Asked on 10/29/2021
2 answerUsually we write the Yang-Mills theory with gauge group $G$ as$$frac{1}{g^2} mathrm{Tr}_{R} (Fwedge star F)$$But here we need to choose what $R$ is. There are...
Asked on 10/29/2021
1 answerConsider two consecutive boosts in $2+1$ dimensional spacetime, the first along the $x$-axis and the second along the $y$-axis. The net transformation is $$B_y(theta_2)B_x(theta_1)=begin{pmatrix}coshtheta_2 &...
Asked on 10/29/2021
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