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My professor definied the adjugate of a tensor $mathbf{t}in T^{1}_{1}(E)$ (E is just a vector space of dimension n) by defining its components as $adj(mathbf{t})^{a}_{b}=frac{1}{(n-1)!}varepsilon_{bi_{2}...i_{n}}t^{i_{2}}_{j_{2}}...t^{i_{n}}_{j_{n}}varepsilon^{aj_{2}...j_{n}}$Then he...
Asked on 02/13/2021
0 answerWhy is it ${bf i} times {bf j} ={bf k}$, but if the order is interchanged it becomes ${bf j} times {bf i} =-{bf k}$? I did...
Asked on 02/13/2021 by KRATOS0990
3 answerConsidering a classical scalar field theory, I can find the canonical energy momentum tensor and if I calculate the $00$ component I get: $$T^{00}= frac{1}{2} dot phi^2 +...
Asked on 02/13/2021
1 answerIn this video potassium is dropped into the bucket and it reacts with the water present in the bucket causing an explosion within the bucket itself. I don't...
Asked on 02/13/2021 by Glowingbluejuicebox
6 answerBoiling point is defined by wikipedia as:The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding...
Asked on 02/13/2021
3 answerI'm just stepping for the first time into plasma physics and I'm studying on Chen's "Introduction to plasma physics" and on the notes of professor Richard Fitzpatrick. I just seem...
Asked on 02/13/2021 by Lyil
2 answerWhy does electric potential definition need to distinct a positive test charge since the result will be the same even with a negative test charge? We could define electric potential...
Asked on 02/13/2021 by nonlinearly
1 answerI found this equation: $n_nu = frac{3}{4} frac{g_nu T_nu^3}{g_gamma T_gamma^3} n_gamma$ Where does it come from?...
Asked on 02/13/2021
0 answerSuppose a man is standing on a merry-go-round which is rotating with some speed, if he jumps out in the radial direction, then the rotation speed of the merry-go-round is...
Asked on 02/13/2021
5 answerWhen deriving the existence of the photon, we start with the free Lagrangian $mathcal L_{text{free}} = bar{psi}left( igamma^{mu}partial_{mu}-mright)psi$ and require $U(1)$ local gauge invariance: $psi(x)rightarrow psi^{'}(x) =e^{iqalphaleft(xright)}psi(x)$,...
Asked on 02/13/2021
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