1. The problem statement, all variables and given/known data http://imgur.com/eYoa8Ut 2. Relevant equations Torque=rt=I(alpha) t-mg=-ma alpha = a/r 3. The attempt at a solution t-mg=-ma is the equation for the hanging mass. To find how much this turns the small wheel, rt=I(alpha) I and r are known rt=Ia/r I'm not sure what to do from here. If I try and solve for a and t now, it gives an incorrect answer. I think this is due to me not doing anything with the larger wheel yet, but I'm not sure what to do with it. I know that the tension in the upper and lower part of the belt are not equal, and both produce torque of their own. Tupper should produce a clockwise moment, Tlower should produce a counterclockwise moment.