MHT CET Physics question

A fly wheel is rotating with a definite angular velocity. Suddenly a fragment from its edge breaks-off and falls away. Its M.I. [MP PET 1994]

(A)Increases and its angular velocity decreases
(B)Decreases and its angular velocity increasesCorrect
(C)Remains constant
(D)None of these

Answer: (B)

Solution

Removing mass from the rim decreases the moment of inertia, and with no external torque the angular momentum is taken as conserved, so the angular velocity increases;

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Question ID VK-040621