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 Feb 11 comment Energy conservation in Hubble Expansion it seems it is related to this question physics.stackexchange.com/questions/15279/… Nov 30 comment Galilean transformation of wave equation Hi ... shouldn't $\frac{\partial }{\partial x'} = \frac{\partial }{\partial x} - \frac{1}{V}\frac{\partial }{\partial t}$?? could you elaborate why just $\frac{\partial}{\partial x} = \frac{\partial}{\partial x'}$ ?? Sep 9 comment Investigation of a pendulum's period, problem creating equation to sum the dynamic velocity the $t=t(\theta)$ is itself an approximating function. Naturally i would expect and approximating function. Seems that it exists from equation $(31)$ in that paper. (+1) Sep 9 comment Investigation of a pendulum's period, problem creating equation to sum the dynamic velocity i would like to know if inverse of this function $t = t(\theta)$ exist or not. Aug 6 comment Why do rolling disc (coin) move in circular path? all right thanks!! Aug 6 comment Why do rolling disc (coin) move in circular path? @Ankush The coin is moving in circle means it should be spinning ... with period equal to the period of circular motion. Aug 6 comment Why do rolling disc (coin) move in circular path? $J$ is angular momentum. Aug 6 comment Why do rolling disc (coin) move in circular path? @Ankush since the coin is moving in circle ... something must continuously change the direction of the coin (so that coin follows circular path). Aug 6 comment Why do rolling disc (coin) move in circular path? wouldn't that torque be in out direction? please check update. Aug 6 comment Why do rolling disc (coin) move in circular path? and thanks for response!! Aug 6 comment Why do rolling disc (coin) move in circular path? shouldn't this kind of torque make the coin fall? ... it comes towards us. Aug 6 comment Why do rolling disc (coin) move in circular path? could you elaborate a bit please? Aug 5 comment Why do rolling disc (coin) move in circular path? can you elaborate your answer on Torque (for thinner disc)? Aug 4 comment Why do rolling disc (coin) move in circular path? hold on ... i'm uploading another one Aug 4 comment Why do rolling disc (coin) move in circular path? sorry ... i couldn't find the tool to rotate the disc earlier Aug 4 comment Why do rolling disc (coin) move in circular path? can you tell me if the Torque I showed in the figure is right? Jul 30 comment Why does a photograph of a face look like it is always watching you? I note gun in movie poster ... no matter through angle which I look ... it always looks it it's going to shoot me :D Jul 12 comment Lennard-Jones potential - equilibrium $\vec F = -{d U \over dr } = 0$ Jul 1 comment Solution to the Maxwell's equation yeah that's the only part i know!! ... how to get that $\vec E$ part Jun 18 comment waves on water generated by a falling object I'm planning a simulation project .. I'm not in hurry!! We will discuss this later after my exam.