Manishearth
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 Apr 23 comment Why we cannot use Gauss's Law to find the Electric Field of a finite-length charged wire? @leocod: If you don't want to wait for another answer and are satisfied with this one, you can "accept" it by clicking the green tick next to it :) Apr 23 comment Trajectory of projectile thrown downhill Alright, it's independent of $g$. My formula is $R=\frac{2u^2}{g\cos\varphi}\left(\cos\theta\sin(\varphi+\theta)\right)$, maximum at $\theta=\frac\pi2-\frac\varphi2$. What's yours? Apr 23 comment Trajectory of projectile thrown downhill @S.RobertJames: I think that the answer is dependent upon the ratio of the initial speed to gravity. Apr 23 answered Why we cannot use Gauss's Law to find the Electric Field of a finite-length charged wire? Apr 23 answered Angle of deflection of an atomic nucleus Apr 22 comment A person weighing 100 N stands on some bathroom scales in a lift. If the scales show a reading of 110 N, which way is he going That's fine, just don't give the final answer. :) Apr 22 comment Infinitely charged wire and Differential form of Gauss' Law Ahh I see. Though when talking about Maxwell's equations, differential f orm' has a specific meaning. Apr 22 comment Why does the higher pressure of air underneath an aeroplane wing keep it flying? Link-only answers are frowned upon here, please provide at least an overview of what is said there. In this case, the question is pretty simple, so a full answer wouldn't hurt. Apr 22 answered Why does the higher pressure of air underneath an aeroplane wing keep it flying? Apr 22 comment Infinitely charged wire and Differential form of Gauss' Law +1 for actually doing the math. But you've missed out on the differential form of Gauss' law ($\nabla\vec E=\rho$). $\vec E=-\nabla\phi$ is NOT the diff form of Gauss' law. Apr 22 comment A person weighing 100 N stands on some bathroom scales in a lift. If the scales show a reading of 110 N, which way is he going Please only give hints and partial solutions to homework problems, not a full solution. Apr 22 revised How much lift does an airplane get from its wings, vs the rest of the airframe? deleted 3 characters in body; edited tags Apr 22 comment A charged particle moves in a plane subject to the oscillatory potential @mnky9800n: Note that you can "accept" and answer by clicking the green tick if you feel that it helped you (and you don't want to wait for another answer). Apr 22 answered A charged particle moves in a plane subject to the oscillatory potential Apr 22 answered No attraction radially in an cylinder of spherical magnets Apr 22 comment Calculating eccentricity from semi-major axis, position and velocity of particles @Mithra: knowing only these see hint 2. Pretend to know everything, then find relations and reduce your variables. And btw, this is only a 2D system. I don't know about any easier methods. Apr 22 comment Explain these graphs of rotation and velocity of pucks on air hockey board You don't need to correct it, any symbol is correct. You just need to specify. Apr 21 comment Is the free energy bounded Yes, but it still can be bounded once you set a datum. The bound depends upon the choice of datum, that's all. Apr 21 answered Calculating eccentricity from semi-major axis, position and velocity of particles Apr 21 comment No attraction radially in an cylinder of spherical magnets Could you add some diagrams/pics of the situation? It's really hard to understand how you are adding the little ball and all.