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Homework Help: Rotational Kinematics

  1. Sep 24, 2008 #1
    The question and solution is here
    http://i359.photobucket.com/albums/oo31/tanzl/Set4Problem3.jpg

    The solution is quite long. Is there any way I can use conservation of momentum (translational or rotation) to calculate this question? such as
    initial momentum of ball = final momentum of ball + final momentum of plank
    Since the plank does not have any translational motion at its center of mass, then its momentum is zero.
    But, I think it wont works because pivot actually exerts force on the plank to constraint its translational motion. So, the system is not closed.
     
  2. jcsd
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