An oversized yo-yo is made from two identical solid disks each of mass M = 2.40 kg and radius R = 9.5 cm. The two disks are joined by a solid cylinder of radius r = 4.00 cm and mass m = 1.00 kg as in the figure below. Take the center of the cylinder as the axis of the system. (a) What is the moment of inertia of the system? Give a symbolic answer. (Use any variable or symbol stated above as necessary.)
(b) What torque does gravity exert on the system with respect to the given axis?