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Homework Help: Centripetal force of an ice skater

  1. Jun 30, 2010 #1
    1. The problem statement, all variables and given/known data
    A 55.5 kg ice skater is moving at 4.02 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.807 m around the pole. (a) Determine the force exerted by the horizontal rope on her arms. (b) Compare this force with her weight by finding the ratio of the force to her weight.

    2. Relevant equations
    FC = mv2 / R


    3. The attempt at a solution
    a. FC = (55.5 kg)(4.02 m/s)2 / 0.807 m
    FC = 1111.4 N

    b. 1111.4 N / 55.5 kg = 20.02 ?
     
  2. jcsd
  3. Jun 30, 2010 #2

    PhanthomJay

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    her weight is not 55.5 kg. That's her mass.
     
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