Question Detail

PHY 101 Rotational Motion Objective Question
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Question

A figure skater pulls her arms in during a spin, decreasing her moment of inertia. What happens to her angular speed?
Options
A It decreases.
B It remains the same.
C It increases.
Correct Answer
D It becomes zero.
Correct Answer

Option C is the correct answer.

Detailed Explanation

When no external torque acts, angular momentum L = Iω is conserved. If the skater decreases her moment of inertia I, her angular speed ω must increase to keep the product Iω constant.

Hint

Apply the conservation of angular momentum. Angular momentum L = Iω is constant if no external torque acts.

Question Info

Course: PHY 101
Topic: Rotational Motion
Type: Objective
Difficulty: Not specified
Question 761 of 1250
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