A solid sphere rotates freely about its axis in space. Its radius is increased without changing its mass. Which quantity remains constant?
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Question

A solid sphere rotates freely about its axis in space. Its radius is increased without changing its mass. Which quantity remains constant?

G1 Physics · Accepted Answer

Step 1: With no external torque, angular momentum L=Iω is constant. Step 2: Increasing radius raises I, so ω falls and K=L²/(2I) changes. Final answer: D — angular momentum.