An ice cube is initially frozen to the surface of a freely spinning circular pla

Question

An ice cube is initially frozen to the surface of a freely spinning circular platform at a short distance from its center, as shown above. When the bottom of the ice cube melts, it starts sliding with respect to the platform with some nonzero friction, getting farther from the center. Which of the following indicates whether the angular momentum of the system, consisting of the platform and the ice cube, changes as the ice cube slides and provides correct supporting information? Changes Information (A) Yes The rotational inertia of the system increases. (B) Yes The ice cube speeds up. (C) No The system gains rotational inertia, but the platform loses angular speed. (D) No The ice cube and platform exert no torques on each other.

Explanation / Answer

The correct answer is C)

Angular momentum changes : No

Supporting information : The system gains rotational inertia,but the platform loses angular speed

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