1. The problem statement, all variables and given/known data There are two blocks, one of mass m1 and the other of m2. They are connected by a rope that runs over a pully of radius R and interia I. m2 slides down a frictionless incline at an angle theta, and m1 hangs virtically while being pulled up by the tension in the rope. Find the expression for acceleration. 2. Relevant equations Fnet=m2gsin(theta)-m1g F/M=a 3. The attempt at a solution With the previous two equations I came to this conclusion... (m2gsin(theta)-m1g)/(m1+m2+I) The right answer has I/R^2 instead of just I. I figured it would be just I because the mass of an object is its inertia. Howwoud I derive the I/R^2?