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MMLU / A man stands with his hands to his sides on a frictionless platform that is…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

A man stands with his hands to his sides on a frictionless platform that is rotating. Which of the following could change the angular momentum of the man-platform system?

choices

  1. The man catches a baseball thrown to him by a friend.
  2. The man thrusts his arms out away from his body
  3. The man thrusts his arms out away from his body, and then quickly brings his arms back to his side again.
  4. The man jumps straight up in the air and lands back on the platform.

subject

high_school_physics

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Source and history

Official source

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