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I have a doubt

  1. Mar 28, 2007 #1
    A ball with mass m = 10kg is attached to one end of a massless string of length r = 5m.?
    The other end of the string is fixed about a point. The ball rotates about this point at a frequency of 1 Hz/ While the ball is rotating, the string is reeled in until its length r = 3m. If the system is not otherwise disrupted in any way, what is the new frequency of rotation?
    25/9 Hz
    5/3 Hz
    1 Hz
    3/5 Hz
    9/25 Hz

    can you help out this hard and I've tried everything? Please


    :smile:
     
  2. jcsd
  3. Mar 28, 2007 #2
    What have you tried?
     
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