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MHT CET202618 April 2026Morning ShiftPhysicsRotational MotionActual

The angular momentum of a rotating body is 'L'. When the frequency of rotating body is tripled and its kinetic energy is made one-third, the new angular momentum becomes

Options

  1. A9L
  2. B6L
  3. CL 3
  4. DL 9

Correct answer

D. L 9

Step-by-step solution

The kinetic energy of a rotating body is given by K = 1 2 L Since = 2 f , we can write K = L f Therefore, the angular momentum is L = K f Given that the new frequency is f' = 3f and the new kinetic energy is K' = K 3 The new angular momentum is L' = K' f' = K 3 (3f) = 1 9 K f = L 9 Answer: L 9

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