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Homework Help: Centripetal Force Skater Speed Question

  1. Oct 2, 2009 #1
    1. The problem statement, all variables and given/known data
    A skater holds her arms outstretched as she spins at 225 rpm. What is the speed of her hands if they are 152 cm apart?

    3. The attempt at a solution
    I converted 225 rpm to 3.57 rps and found the angular velocity (23.56 rad/s) to plug into the equation v=wr, but it didn't work. What would that distance between her hands be considered? I bet this is rediculously easy but I can't figure it out! Thanks in advance!
  2. jcsd
  3. Oct 2, 2009 #2
    As she spins, the tips of her hands trace out a circle, the diameter of which is the distance between her two hands.
    Last edited: Oct 2, 2009
  4. Oct 4, 2009 #3
    Ah thank you!
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