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Changed rotational inertia leads to changes in angular velocity for a given:
AElapsed time
BSurface area
CAngular momentum
DApplied force
Answer & Solution
Correct answer: C. Angular momentum
1. Angular momentum is what stays fixed in the comparison.
2. Changes in radius or mass distribution change rotational inertia.
3. That changes angular velocity and linear speed.
4. The comparison is made for a given angular momentum.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 10 'Rotational Motion and Angular Momentum', sections 10.1-10.7_
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