Recent content by kivilumi

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...

Omg thanks so much. So mgh +1/2mv^2 = E net? Or is it mgh + 1/2mv^2 = mg(2r) + 1/2mv^2?

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...

Sorry, I just need at least help starting. Physics is blowing my mind.

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...