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A figure-skater finishes her routine with a dramatic spin. Initially, she spins at a rate of 1.3 rev/sec


A figure-skater finishes her routine with a dramatic spin. Initially, she spins at a rate of 1.3 rev/sec. During this time, the figure skater has her arms stretched out. In each hand, she holds a mass of 2.3 kg at a distance of 0.65m from the center of her body. She then pulls her arms in so that the masses are tucked into the middle of her chest. The moment of inertia of her head-torso-legs remains fixed at 24 kg-m2. You can ignore the mass of her arms. What is the final rate of her spin in rev/sec? 


  • 3.25 

  • 7.35

  • 5.23

  • 2.35

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Answer #1

The final rate of her spin is 2.35 rev/sec.

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