alleryWhen no external torque acts, what stays constant?
AKinetic energy
BAngular momentum
CAngular velocity
DMoment of inertia
Answer & Solution
Correct answer: B. Angular momentum
1. Torque is the rate of change of angular momentum.
2. Zero torque means no change.
3. So angular momentum is conserved.
_Source: syllabus Physics Part I, Chapter 7, Systems of Particles and Rotational Motion._
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