A Skater Extends Her Arms Horizontally, Holding a 5-Kg Mass

question 46

Multiple Choice

A skater extends her arms horizontally, holding a 5-kg mass in each hand. She is rotating about a vertical axis with an angular velocity of one revolution per second. If she drops her hands to her sides, what will the final angular velocity (in rev/s) be if her moment of inertia remains approximately constant at 5 kg⋅m², and the distance of the masses from the axis changes from 1 m to 0.1 m?

• A) 6
• B) 3
• C) 9
• D) 4
• E) 7

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