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 Jul 23 awarded Notable Question Nov 21 awarded Popular Question Jul 7 comment Do photons have acceleration? This doesn't really describe acceleration. Is there a point at which the velocity of the photon is half way between the velocity it travels through the two media? If not, the jump in velocity is discontinuous, is not differentiable, and so, cannot be described as having an acceleration. Jul 7 comment Do photons have acceleration? @BenCrowell: Of course. But it made for a shorter response and was only a little wrong. Mar 26 awarded Yearling Feb 9 awarded Critic Feb 9 comment Thought experiment regarding an object approaching a mirror The entire point of relativity is that c + v = relative velocity is completely wrong. Superman will always see light coming towards him at c. Apr 21 comment Isn't the uncertainty principle just non-fundamental limitations in our current technology that could be removed in a more advanced civilization? If a tree falls in a forest that may or may not exist, does it make a wavefunction? Apr 16 comment Work Done by Rockets in Orbital Motion I figured an integral here would be too much detail for the required answer. And it doesn't really matter for such a simple potential. Apr 13 revised Work Done by Rockets in Orbital Motion Changed potential to negative value. Apr 13 revised Work Done by Rockets in Orbital Motion added 334 characters in body; added 20 characters in body Apr 13 comment Work Done by Rockets in Orbital Motion Hmm... I suppose a $g_{eff}$ would be more appropriate... Apr 13 answered Work Done by Rockets in Orbital Motion Apr 12 comment Does Polytetrafluoroethylene (Teflon) have low wind resistance? I see. The short answer, I suppose, is no. At least not necessarily. Friction is due to microscopic factors while resistance in a fluid is mainly due to macroscopic factors. Apr 12 awarded Commentator Apr 12 comment Does Polytetrafluoroethylene (Teflon) have low wind resistance? Note: against any solid. Apr 12 comment Why are alpha particles made of 2 protons and neutrons? Because "isospin" and "spin singlet" requires a good bit of background knowledge. This graph gets the point across much more effectively. Apr 12 answered How do we know that internal conversion creates no intermediate photon? Apr 1 awarded Scholar Apr 1 accepted Why is light described by a null geodesic?