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 Jul 15 awarded Yearling Aug 21 revised Is it possible to generate an instrument which can generate wireless electricity? added 218 characters in body Aug 21 answered Is it possible to generate an instrument which can generate wireless electricity? Aug 16 comment Tips on teaching Dimensional Analysis? Dimensional analysis is not very useful in finding exact answers to questions (like yours). It's a way to find a relation between variables which could be of by a constant factor. For example, $s = g t^2$ and $s = 0.5 g t^2$ are both dimensional correct, but only the second describes the relation between travel distance $s$ and travel time $t$ of a free falling object. Jul 31 awarded Critic Jul 20 revised How do mirrors work? added 1 characters in body Jul 20 answered What voltages are used to “safely” shock someone (as in a carnival game) Jul 20 answered How do mirrors work? Jul 20 awarded Citizen Patrol Jul 17 awarded Editor Jul 17 revised Can you use PCR to make a standard kg? added 604 characters in body Jul 17 answered Can you use PCR to make a standard kg? Jul 16 awarded Nice Answer Jul 16 comment Hermitian operator ?? is this possible One problem could be that by restricting your operator to be real you can't differentiate it with respect to $\Psi(x)$ and thus also not with respect to $x$. Jul 16 comment What exactly is a kilogram-meter? @dirtside A kilogram meter could come up in balancing, where it would be the 'torque'-like equivalent of one kilogram at one meter from the turning point. I say 'torque'-like because torque would be measured in Newton-meter, which only differs by the gravitational accelerating $g$ as extra multiplier. Jul 15 awarded Supporter Jul 15 awarded Teacher Jul 15 answered What exactly is a kilogram-meter?