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Mar 27, 2020 at 15:37 vote accept asv
Mar 26, 2020 at 14:03 comment added Michael Engelhardt Very nice. We can also check how the $N=1$ case (cf. nitpick to OP) escapes this: Then, the virial theorem reduces to $0=0$ (the particle can, and must, remain at rest) and there is no contradiction. As soon as $N>1$, the potential energy is strictly positive, and the contradiction arises.
Mar 26, 2020 at 0:14 history answered Dominik CC BY-SA 4.0