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# AP® Physics 1 & 2

Free Version
Moderate

APPH12-85U09O

A flat disk is rotating about an axis of rotation perpendicular to the disk and through the center of mass. The dimensions and angular velocity are shown in the image on the left below.

Suddenly the angular velocity changes to what is in the right image with no change in mass and no net torque provided. The radius also changes.

Which value is the best approximation of the new radius based on the information given?

A

$0.65\text{ m}$

B

$0.42\text{ m}$

C

$1.88\text{ m}$

D

$0.83\text{ m}$