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Homework Help: Mechanical Energy

  1. Mar 9, 2007 #1
    1. The problem statement, all variables and given/known data

    A thin rod, of length L and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m is attached to the other end. The rod is pulled aside through an angle and released.
    What is the speed of the ball at the lowest point if L = 2.20 m, = 19.0°, and m = 500 kg?

    2. Relevant equations

    W=mgd(cos theta)

    3. The attempt at a solution

    How do I get the velocity? Can I get it by using the above equations if I solve for W? Where do I plug the answer for W in to find the velocity?
  2. jcsd
  3. Mar 9, 2007 #2


    User Avatar
    Gold Member

    Do you know what W is as defined in your post ? Can you give it a name ?
  4. Mar 9, 2007 #3
    W=work done
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