A compact disc rotates about its center at constant angular speed. Which one of the following quantities is constant and non-zero for a dust particle near the edge of the disc?
A)linear velocity
B)torque about the center of the disc
C)centripetal acceleration
D)angular momentum
E)angular acceleration

Question

Quizplus · Accepted Answer

Angular momentum is conserved for a dust particle near the edge of the disc because there is no external torque acting on the particle.

A Compact Disc Rotates About Its Center at Constant Angular