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 Apr 21 reviewed Approve What really is the smallest “mass” or “object” in the universe? Apr 20 awarded Popular Question Apr 14 reviewed Approve ising-model tag wiki excerpt Apr 14 reviewed Approve ising-model tag wiki Apr 6 awarded Notable Question Apr 4 awarded Good Question Apr 3 awarded Enlightened Apr 3 awarded Nice Answer Mar 9 awarded Nice Question Mar 7 awarded Popular Question Feb 29 comment What is special about many-body localization as opposed to Mott insulator Do you mean Anderson localization? That's the one you get due to disorder. Feb 29 comment How does constant thrust avoid quadratic kinetic energy accumulation? I don't think that quite answers the question; I think the question is more along the lines of "In time interval $(t_1, t_2)$, the kinetic energy change is $1/2 m a (t_2^2 - t_1^2)$ and as such clearly not merely a function of $t_2 - t_1$. And that would imply that the energy output of our "motor" needs to increase with time. Feb 25 reviewed Approve Derivation of Schrodinger's wave equation Feb 19 reviewed Approve Wrong calculation of work done on a spring, how is it wrong? Feb 16 answered Bloch Functions as an implication of the Crystallographic Restriction Theorem? Feb 15 reviewed Approve How do magnets work in classical electromagnetism? Feb 15 awarded Good Answer Feb 13 comment Charge distribution on a line So, instead of working on my thesis I looked more into this and can't find a simple way to solve this, so I did some googling and found this paper by EM god David J. Griffiths: colorado.edu/physics/phys3320/phys3320_sp12/AJPPapers/… Turns out there is no simple answer... Feb 13 comment Charge distribution on a line Hm, intuitively I'd start with your equality, bring the righthandside over and demand that this should be 0 exactly. Then interpret this as a function of X and compute the derivative. That will be a bit tricky because both the integral limits and the function inside the integral depend on $X$, so maybe you have to do it "by hand", by explicitly substituting $X + dX$ for $X$, expanding to first order in $dx$, then subtracting the $X$-only part. This should hopefully give a useful equation for $\lambda$. Feb 12 reviewed Approve Magnets and speed of light