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 Mar 14 revised Interpretation of dispersion relation typo Dec 15 awarded Yearling Jul 2 comment electric field inside hollow conducting bodies You are right about the Farady Cage, but wrong about the vanishing of the force. I added an answer that explains this. Jul 2 answered electric field inside hollow conducting bodies Jun 22 answered Is a larger, heated space easier or harder to ventilate if the heat source and ventilation are the same? Jun 22 comment Is a larger, heated space easier or harder to ventilate if the heat source and ventilation are the same? Define "easier". The fans will do the same work in both cases. May 9 awarded Taxonomist Mar 20 comment Definition of non-degenerate metric tensor I have never heard this definition of degenerate matrix. The identity matrix has only one eigenvalue (which is 1) and it corresponds to all the vectors (every vector is an eigenvector of the identity). Is the identity degenerate? Mar 19 comment Definition of non-degenerate metric tensor They are related in the same sense that the sentence "two times three is six" is related to the statement $2\times3=6$. It's the same statement, one in English, the other in algebraic notation. Mar 19 comment Definition of non-degenerate metric tensor The question is not clear. Is det$\ne0$ not the definition of non-degeneracy? Do you know a different definition and you search for a proof that the two are equivalent? Mar 19 comment Electric field in a hollow object Hint: when you write $$...=\oint_\Gamma E_i d\Gamma=E_i\oint_\Gamma d\Gamma=...$$ You assume that the electric field is constant over the surface of integration (and perpendicular to it). Is this true in the second example? Mar 18 comment Insight into Torricelli's Equation ($v^2=u^2+2as$) Suvat (also, Suvad) is a village in the Lachin Rayon of Azerbaijan. Mar 16 answered Wave equation - dissipation Dec 17 awarded Good Answer Dec 15 awarded Yearling Dec 10 comment Mass particle trajectory on a sphere @KyleKanos, you've misunderstood the OP question. There's no gravitational field due to the sphere, he's talking about a motion in a constant gravitation constrained to a sphere. Dec 10 revised Mass particle trajectory on a sphere addendum Dec 9 answered Mass particle trajectory on a sphere Dec 4 answered How can black holes have electric charge and spin? Sep 21 comment Density of States vs Dispersion en.wikipedia.org/wiki/…