Question

The moment of inertia of a thin ring of mass M and radius R about its symmetry axis is I_CM = MR² 

Kira is working the ring-toss booth at a local carnival. While waiting for customers, Kira occupies her time by twirling one of the plastic rings of mass M and radius R about her finger. Model the motion of the plastic ring as a thin ring rotating about a point on its circumference. What is the moment of inertia of the plastic ring? 

Answer 1