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Question: Answered & Verified by Expert
Assertion : A person standing on a rotating platform suddenly stretched his arms. The platform slows down.
Reason : This happens as angular momentum is conserved.
PhysicsRotational MotionAIIMSAIIMS 2019 (25 May)
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion.
  • B If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C If assertion is true but reason is false.
  • D If both assertion and reason are false.
Solution:
1936 Upvotes Verified Answer
The correct answer is: If both assertion and reason are true and reason is the correct explanation of assertion.
On stretching arms, his moment of inertia (I) increases. As no torque has been applied, therefore $I \omega=$ constant.
As $I$ increases, $\omega$ decreases.

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