Alyosha

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Nov 30	accepted	*Is there a mathematical derivation of potential energy that is not* rooted in the conservation of energy?**
Nov 30	comment	*Is there a mathematical derivation of potential energy that is not* rooted in the conservation of energy?** Thank you for the mathematical description. Is there nothing more to energy and work other than 'a value that is conserved' (although not conserved in the same way, or course)?
Nov 30	comment	*Is there a mathematical derivation of potential energy that is not* rooted in the conservation of energy?** Where does the equation for work come from? Is that form its definition, or is it empirically based? And is kinetic energy defined by anything, or did physicists mould the equation for it around to fit an everyday thing?
Nov 30	revised	*Is there a mathematical derivation of potential energy that is not* rooted in the conservation of energy?** added 66 characters in body
Nov 30	comment	*Is there a mathematical derivation of potential energy that is not* rooted in the conservation of energy?** Sorry, I forgot to specify that I was considering about only conservative forces.
Nov 30	comment	*Is there a mathematical derivation of potential energy that is not* rooted in the conservation of energy?** As an example of $(2)$, physics.stackexchange.com/questions/535/…
Nov 30	asked	*Is there a mathematical derivation of potential energy that is not* rooted in the conservation of energy?**
Nov 24	comment	In classical mechanics, are complex numbers unphysical? @tpg2114 Thanks for the answer.
Nov 23	asked	In classical mechanics, are complex numbers unphysical?
Nov 23	comment	Why do physicists believe that particles are pointlike? Experimentally at Imperial College London and elsewhere experiments have shown that electrons are pointlike to a great precision. www3.imperial.ac.uk/ccm/research/edm/overview/motivationnon has links to the many results pages, so I thought it would be a better link than any specific page.
Nov 6	comment	List of freely available physics books Feynman lectures are down
Oct 31	comment	How do we know the universe is expanding, and not that its contents are shrinking? When you say 'matter is distributed like that', do you mean that we do not observe precisely enough to see whether or not the FRW metric holds or is it that our observations are accurate enough AND they tell us that the FRW metric is not fully implemented (if that's the right word) in our universe?
Oct 31	accepted	How do we know the universe is expanding, and not that its contents are shrinking?
Oct 31	comment	How do we know the universe is expanding, and not that its contents are shrinking? Thanks for the answer, but by Hubble's law the Earth-Sun space (assuming it is a constant) is expanding 0.36 $\mu m/s$. Of course the fact that the Earth-Sun distance varies due to their movements in space, but that's irrelevant.
Oct 30	comment	How do we know the universe is expanding, and not that its contents are shrinking? So is there no self-consistent way that these natural constants could be changing that mimics exactly the fact that if I measure the distance between A and B (which are at rest relative to space (if that makes sense)), later I will measure a longer distance due to Hubble expansion and at the same time these constants remain constant factors of one another?
Oct 30	asked	How do we know the universe is expanding, and not that its contents are shrinking?
Oct 29	awarded	Teacher
Oct 29	comment	Relativistic mass and imaginary mass @CrazyBuddy I believe Chernenkov radiation has less to do with the question than you make out- it's more of an electrodynamical oddity than a relativistic one- vacuum Chernenkov radiation would be completely different to non-vacuum.
Oct 29	answered	Does mass affect speed of orbit at a certain distance?
Oct 29	comment	$sss$ decay and violation of strangeness As an answer to the second question, strangeness tends not to be conserved in weak interaction or decay.