A turntable has a moment of inertia of 3.0 *10^-² kg·m² and spins freely on a frictionless bearing at 25 rev/min. A 0.60-kg ball of putty is dropped vertically on the turntable and sticks at a point 0.10 m from the center. By what factor does the kinetic energy of the system change after the putty is dropped onto the turntable?

Question

Quizplus · Accepted Answer

The kinetic energy decreases because the system's moment of inertia increases when the putty sticks to the turntable, causing the angular velocity to decrease due to conservation of angular momentum. The factor by which the kinetic energy changes is 0.83.

A Turntable Has a Moment of Inertia of 3