Sorry I have one more
Diagram -
http://img265.imageshack.us/img265/4533 ... elpww4.jpg
Consider a bicycle wheel that initially is not rotating. A block of mass m is attached to the wheel and is allowed to fall a distance h. Assume that the wheel has a moment of inertia I about its rotation axis.
Consider the case that the string tied to the block is attached to the outside of the wheel, at a radius r_A
(a) Find omega_A, the angular speed of the wheel after the block has fallen a distance h, for this case.
Express omega_A in terms of m, g, h, r_A, and I.
(b) Now consider the case that the string tied to the block is wrapped around a smaller inside axle of the wheel of radius r_B View Figure . Find omega_B, the angular speed of the wheel after the block has fallen a distance h, for this case.
Express omega_B in terms of m, g, h, r_B, and I.
WORK DONE :
Im really not sure how to do either of these. I was going to use this formula (
http://upload.wikimedia.org/math/6/c/d/ ... 84b456.png) but I couldnt apply it
Any help would be greatly appreciated. Thanks!