Physics NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 4 PCB MCQ (Single Correct)

A gymnast takes turns with her arms & legs stretched. When she pulls her arms and legs in

A
the angular velocity decreases
B
the moment of inertia decreases
C
the angular velocity stays constant
D
the angular momentum increases

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The correct answer is:
C

Since no external torque act on gymnast, so angular momentum is conserved. After pulling her arms & legs, the angular velocity increases but moment of inertia of gymnast, decreases in, such a way that angular momentum remains constant.

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