A Figure Skater on Ice with Arms Extended,spins at a Rate

question 78

Multiple Choice

A figure skater on ice with arms extended,spins at a rate of 2.5 rev/s.After he draws his arms in,he spins at 6.0 rev/s.By what factor does the skater's kinetic energy change when he draws his arms in?

• A)2.4
• B)1.0
• C)0.42
• D)0.12

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