A student sits on a frictionless rotating stool with her arms outstretched

PHYSICS · Subjective · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion

Problem

A student sits on a frictionless rotating stool with her arms outstretched. Without touching anything external, she pulls her arms inward and her rotational speed increases. In one or two sentences, explain why her angular velocity changes even though no external torques act on the system.

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