Recent content by LiftHeavy13

Hi, I'm looking for a proof of faraday's law. This is the only page which gives a formal proof of it, but I do not understand the transformation from the first to the second step. It someone could help me out, I would appreciate it. Also, if someone could explain the opposite as well: how do you...

Hi guys, I'm looking for an equation and/or proof of the magnetic field produced inside a solenoid with a finite length (hence, it shouldn't just be "muNOT n I." For some reason I can't find a simple proof anywhere. I have no idea where to start. ampere's law obviously doesn't work, and that...

the electric field inside a solid charged conducting sphere is always zero for obvious reasons. the electric field inside a solid uniformy charged nonconducting sphere is nonzero and varies at all points. since it's nonconducting, the electric field at a certain point still won't move...

Okay, so you're treating the surface as an entire entity/point, correct?

Damn man, thanks. I wasn't sure b/c every time I asked my physics teacher, he kept coming up with weird explanations for it. It's funny how a little detail like that will completely throw you off. Just as a follow up, for a frictional torque about the pivot, would the work be that force...

http://dev.physicslab.org/Document.aspx?doctype=3&filename=RotaryMotion_RotationalDynamicsPivotingRods.xmlin this example, the rod is swinging with one end pivoted. conservation of energy was used in this example. the change in potential energy was converted to kinetic energy, and mechanical...

jesus, how did i not see that... thanks so much

hey, maybe you should read what I'm asking. I know that angular momentum is conserved; I even stated that in the OP. My question is, once again, how angular velocity can increase if the net toque is zero and therefore angular acceleration is zero.

yeah, sorry made a quick edit. no one has answered it yet, not even my teacher. lol, it makes no sense at all

okay... that still didn't answer the question. how can angular velocity increase if there is no net torque and therefore no angular acceleration?

okay, i realize that the angular momentum of a moving point mass could be looked at about any point, and that angular momentum is conserved as long as no torque is acted on that point mass. but, something i don't understand is how, then, the angular velocity could increase if the moment of...