So i've been using: [tex]\alpha=\tau/I[/tex] More specifically: [tex]\alpha=(r*F)/(.5mr^2)[/tex] I know I'm getting the acceleration just fine. I've then been using: [tex]\omega^2 = 2\alpha\Delta\Theta[/tex] I know the problem is coming in here. Probably in conversion of units (rad/s^2) to (rev/s^2) or something along those lines. The ball hangs on the right end of the block, the first support is on the left end of the block and the second support is 1.5 meters away from the left end of the block. I've been trying all sorts of things, including: L = 2.0 m d = 1.5 m F2 = mg(L/d) F1 = mg - F2 I'm pretty sure the answer should be negative.. but i don't have it right yet.