A physics student is standing on an initially motionless,frictionless turntable with rotational inertia 0.31kg·m2. He's holding a wheel of rotational inertia0.22 kg·m2 spining at 135 rpm about a vertical axis. When he turns the wheel upside down, student and turntable begin rotating at 62 rpm.
a) What is the student's mass, considering him to be a cylinder 30 cm in diameter?
b) How muchwork did he do in turning the wheel upside down? Neglect the distance between the axes of the turntable and wheel.