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I understand that mass number and atomic mass are different by definition.Mass number is the total number of nucleons and isotopic atomic mass is the average atomic weight of all...
Asked on 11/25/2021
2 answerThe question is:"0.38kg of a liquid at 12 degrees C is heated in a copper can weighing 0.9kg by an electrical heater of power 20W for 3 minutes. It reaches...
Asked on 11/23/2021
1 answerThe new SI defines the second as the hyperfine splitting transition time associated to the frequency of that transition of caesium-133, 9192631770 Hz, that is 12 decimals precision, but...I wonder...
Asked on 11/23/2021
1 answerWhile doing some lazy calculations, I came across a curiosity that I'm unable to interpret. It is well known that the cosmological constant $Lambda sim 10^{-52}~mathrm{m^{-2}}$ is usually...
Asked on 11/23/2021
2 answerContext: Consider the advection-diffusion equation with periodic boundary conditions (PBC) over a flat square domain $L times L$.The scalar density $rho $ is transported...
Asked on 11/23/2021
1 answerThe Lorenz-Transformation of the EM-Tensor F is given by the equation$$ F'^{mu nu} = Lambda^{mu}_{ rho} Lambda^nu_{ sigma} F^{rho sigma}$$Then it says that this is...
Asked on 11/23/2021
1 answerI have some problems understanding the symmetry of spatial wave functions. In my experimental physics course they tought us that in atoms the total wave function $Psi_{tot}(vec{r}_1,vec{r}_2)=Psi(vec{r}_1,vec{r}_2)chi(S,M_s)$ has to...
Asked on 11/23/2021
3 answerWhile reading "Four lectures on Poincaré gauge field theory" (available at RG) the authors present a relationship between a tetrad $e^i_{;gamma}$ (with Latin...
Asked on 11/23/2021
0 answerI'm studying special relativity. A general Lorentz transformation is defined by $Lambda^TetaLambda=eta$. Now,begin{align}eta'^{munu} &= Lambda^mu_{;;alpha}Lambda^nu_{;;beta}eta^{alphabeta}\&= (LambdaetaLambda^T)^{munu}end{align} How does this equal $eta^{munu}$? All we...
Asked on 11/23/2021
3 answerTwo questions, 2nd to be written separately concerns more difficult problem for motion of extended charge distributions. First: Two point charges q1,q2. Determine motion of q1 using Newton's...
Asked on 11/23/2021
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