The diagram above shows a top view of a child of mass $M$ on a circular platform of mass $2M$ that is rotating counterclockwise. Assume the platform rotates without friction. Which of the following describes an action by the child that will increase the angular speed of the platform-child system and gives the correct reason why?

Question

The diagram above shows a top view of a child of mass $M$ on a circular platform of mass $2M$ that is rotating counterclockwise. Assume the platform rotates without friction. Which of the following describes an action by the child that will increase the angular speed of the platform-child system and gives the correct reason why?(a) The child moves toward the center of the platform, increasing the total angular momentum of the system
, (b) The child moves toward the center of the platform, decreasing the rotational inertia of the system.
, (c) The child moves away from the center of the platform, increasing the total angular momentum of the system.
, (d) The child moves away from the center of the platform, decreasing the rotational inertia of the system.
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Rachel · Accepted Answer

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