Moderate# Angular Momentum New Radius

APPH12-85U09O

A flat disk with a radius of $0.50 \text{ m}$ and a mass of $1.0 \text{ kg}$ is rotating about an axis of rotation perpendicular to the disk and through the center of mass at an angular velocity of $5.0 \text{ rad/s}$.

Suddenly the angular velocity changes to $3.0 \text{ rad/s}$ with no accompanying change in mass.

If there is no net torque on the disk, which of the following best approximates the new radius of the disk?