Chapter 11, Problem 51P

Jumbo is back! Jumbo is the 4.8-Mg elephant from Example 9.4. This time he’s standing at the outer edge of a 15-Mg turntable of radius 8.5 m, rotating with angular velocity 0.15 s⁻¹ on frictionless bearings. Jumbo then walks to the center of the turntable. Treating Jumbo as a point mass and the turntable as a solid disk, find (a) the angular velocity of the turntable once Jumbo reaches the center and (b) the work Jumbo does in walking to the center.