How do you measure mass? Weight is easy using a scale, but we can't measure mass that way, because then mass would be different on every planet. I know there was a Veritasium video (here) on defining what, exactly, one kilogram was, but they can only define that if they know some previous measurement (i.e., one cube of metal is 2kg)!
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I have an hydrogenic atom, knowing that its ground-state wavefunction has the standard form ψ=Ae−βr with $A = \frac{\bet...
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This image from NASA illustrates drag coefficients for several shapes: It is generally accepted that some variation of the teardrop/airfoil...
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