A thin-walled hoop (ring) of mass and radius rotates about its central axis at an…
PHYSICS · Single correct · AP · Physics 1: Algebra-based · Energy and Momentum of Rotating Systems · Energy and Momentum of Rotating Systems
Problem
A thin-walled hoop (ring) of mass M and radius R rotates about its central axis at an angular speed of 4rads−1. A solid sphere of the same mass and radius rotates about an identical axis at 6rads−1. Which object has the greater rotational kinetic energy?
(a) The sphere
(b) Both have the same rotational kinetic energy
(c) The hoop
(d) Not enough information is provided