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Homework Help: Energy in Rotational Motion

  1. Dec 13, 2009 #1
    1. The problem statement, all variables and given/known data

    A square plate is tilted on one of its corners as shown below. If the corner does not slip, and the plate is allowed to fall, determine the velocity of the moving corner before it hits the ground. The moving corner is point P, which is 45 degrees above the horizontal.
    Mass=1.8kg
    Length of each side=.1m
    Anglecenter of mass=80 degrees
    Anglepoint P=45 degrees


    2. Relevant equations

    Mg(Yfinal-&initial)=.5M omega2

    3. The attempt at a solution

    I don't understand how to find delta Y in order to find potential energy. The center of mass is .071 m.
     
  2. jcsd
  3. Dec 14, 2009 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    Welcome to PF. I am not clear on the plate's position. You will either have to post the picture or do a better job of describing how the plate is sitting before it starts to fall. Thanks.

    AM
     
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