That makes sense. If mg(2r) + 1/2mv^2 = mgh represents the total energy in terms of the top of the circle, would mg(2r) = mgh - 1/2mv^2 represent the energy at the bottom?
Actually I don't know about that previous statement...could I solve for v = (2gh - 2g(2r))^(1/2) and then plug that into F...
Ok, I'm still totally stuck but I think F = mv^2 / r. I'm not sure how to incorporate the other variables... I'm not exactly sure how Potential Energy can be replaced with force... so I'm stuck
I think I need to mix in Kinetic Energy somewhere... but I'm not positive at all where. That's pretty...
Can someone please tell me how to do these problems? Show work if possible please.
http://img517.imageshack.us/img517/5268/physicsap710jx.jpg
http://img517.imageshack.us/img517/2184/physicsap728vu.jpg
I'm not sure at all how force is tied into Potential Energy so I'm not getting anywhere on...