1. The problem statement, all variables and given/known data A pulley has a radius of 2.70 m and a moment of inertia of 39.0 kg·m2. There is a hanging mass with a mass of 4.20 kg and it exerts a force tangent to the edge of the pulley. What is the angular acceleration of the pulley in rads/sec^2? r = 2.7m I=39kg·m2 m=4.2kg 2. Relevant equations a = t/I F = mg t = Fr 3. The attempt at a solution I tried finding the torque on the pulley caused by the mass by multiplying the mass * gravity * the radius and then dividing by the moment of inertia to get the angular acceleration but I keep getting 2.8496 which is apparently wrong.