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Homework Help: Tied mass with angular velocity

  1. Oct 6, 2011 #1
    http://img221.imageshack.us/img221/522/fisikaumn.jpg [Broken]
    A small ball (mass = 0,1 kg) tied to a non-stretchable thread moves over a smooth horizontal plane. The other end of the thread is being drawn into a hole O with a 0,8 Newton force so that the ball moves with a constant radius 0,4 m
    And then Harry pull the thread with a constant force 4 Newton so that the ball moves come near to hole O until its radius is 0,1 m

    a. Work done by Harry = ..... J
    b. Work done by that ball = ...... J

    Thank you very much
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Oct 6, 2011 #2
    Anyone? :(
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