A man standing on a revolving platform spreading his hands outward. Then:

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Navik GD Physics 20 March 2021 (Shift 1) Questions
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  1. angular velocity increase
  2. angular velocity decrease
  3. angular momentum increase
  4. angular momentum is zero

Answer (Detailed Solution Below)

Option 2 : angular velocity decrease
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Detailed Solution

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CONCEPT:

Angular momentum (L):

  • The angular momentum of a rigid body is defined as the product of the moment of inertia and the angular velocity i.e.,

\(⇒ L = Iω \)

Where I = moment of inertia and ω = angular velocity

Law of conservation of angular momentum:

  • When the net external torque acting on a body about a given axis is zero, the total angular momentum of the body about that axis remains constant i.e.,

⇒ I1ω1 = I2ω2

EXPLANATION:

F2 J.K 28.5.20 Pallavi D5

  • When a man standing on a revolving platform and spreading his hands suddenly as he stretches his hand that he is increasing his moment of inertia thereby decreasing his angular velocity using the principle of conservation of angular momentum. Therefore option 2 is correct.
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