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Homework Help: Centripital Acceleration problem

  1. Feb 29, 2012 #1
    Using a rotational platform I found the following values..
    Mass of bob: 457 grams
    Radius: 16 cm
    time to make 100 rotations: 67.4 seconds
    I need to find the velocity and was given the following equation V=2pi(r^2)/t *100
    Once I find the velocity i need to plug that into the following equation to find force

    The counter force in the experiment was 5.4 N and i can't get anywhere near there. Can someone help me with this problem please.
  2. jcsd
  3. Feb 29, 2012 #2
    can you show your attempt at the problem?
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