An 85-kg man stands 0.70 m from the center of a large, rotating turntable with a frictionless axis. Initially, the turntable is rotating at 8.0 rpm (rev/min). After the man (carefully!) walks to the edge of the turntable (radius = 1.6 m), the turntable's speed is just 5.0 rpm. What is the turntable's moment of inertia?
The moment of inertia is _____ kg m2.