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Homework Help: Ball on a string (vertical circle)

  1. Feb 23, 2010 #1
    1. The problem statement, all variables and given/known data
    a 500 g ball moves in a verticle circle on a 1.01 m long string. if the speed at the top is 4.3 m/s, then the speed at the bottom will be 7.62 m/s. what is the tension of the string when the ball is at the top? when is the tension of the string when the ball is at the bottom?

    2. Relevant equations
    tension = (Fnet)=mv2/r

    3. The attempt at a solution
    tension = (Fnet)=(0.5 kg)(4.3)2/(1.01) = 9.15 N

    tension = (Fnet)=(0.5 kg)(7.62)2/(1.01) = 28.7 N

    these answers are wrong, however. and i'm not exactly sure why.
    pointers in the right direction would be much appreciated!
  2. jcsd
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