1. The problem statement, all variables and given/known data A bobbin of M = 3 kg consists of a central cylinder of radius r = 5 cm and two end plates of radius R = 6 cm. It is placed on a slotted incline on which it will roll but not slip, and a mass m = 4.5 kg is suspended from a cord wound around the bobbin. It is observed that the system is in static equilibrium. What is the angle of tilt θ of the incline? 2. Relevant equations F=ma Torque is force times arm perpendicular to the force. 3. The attempt at a solution I know the torque being exerted by mass m is the force (mg) times the distance r; t=mgr. This torque must be equal to the torque being exerted by the mass. How do I find that torque?