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A homogeneous sphere is uniformly heated (or cooled) while the boundary is kept at constant temperature. How does its temperature evolve in time and how is it distributed spatially?...
Asked on 11/21/2021
1 answerAs you can see below, I'd like to know why the saturation is decreasing with the temperature while the absolute amount of water remains constantly.The image is taken from...
Asked on 11/21/2021
1 answerWhen we apply parity on a field two times, we demand that we should get back the same field. This gives us, $P^{2} =1$, which implies, $ P psi...
Asked on 11/19/2021
1 answerI'm studying crystalline solar cell and their working principle, but I still don't completely understand the process. First of all, I understand that we dope a pure crystalline silicon with...
Asked on 11/19/2021
2 answerHow to derive the relation between Euler angles and angular velocity and get this form: $$left.begin{cases}{}P \Q\R \end{cases}right}=left[begin{array}{c}1&0&-sinTheta\0&cosPhi&cosThetasinPhi\...
Asked on 11/19/2021
2 answerIn addition to total energy, which components of the angular momentum $(mathbf{L}_x,mathbf{L}_y,mathbf{L}_z)$ are conserved in the presence of an external potential field $V(x,y,z)$? I've learnt that it is...
Asked on 11/19/2021
1 answerFrom the ideal gas law, we are aware that PV = nRT, which seems to suggest a direct relationship between pressure and temperature, or that as temperature increases, pressure increases....
Asked on 11/19/2021
1 answerThis is a little question that I have been wondering when I need to cut sand paper with scissors. Sand paper can be used to sharpen knives etc. when applied...
Asked on 11/19/2021
2 answerI am reading Cheng&Li's book "Gauge theory of elementary particle physics". In section 16.2, I am confused by some assumptions. Suppose we have a $SU(2)$ gauge theory in ...
Asked on 11/19/2021
1 answerGiven a Hamiltonian $H$, how can I relate the collapse operator for the Lindblad equation to a given environmental effect? Also, how can I relate the constant $gamma$ in front...
Asked on 11/17/2021
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