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Finding v from energy

  1. Dec 5, 2008 #1
    1. The problem statement, all variables and given/known data

    A heavy ball swings on a string in a circular arc of radius 2m.
    The two highest points of the ball's trajectory are Q and Q'; at these points the string is +/- 27 degrees from the vertical. Point P is the lowest point of the ball's trajectory where the string hangs vertically down. The acceleration of gravity is 9.8 m/s^2.

    1.) What is the ball's speed at the point P? Neglect air resistance and other frictional forces.
    2.) What is the magnitude of the ball's acceleration at the point P?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Dec 6, 2008 #2

    CompuChip

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    What is the ball's speed at Q and Q'? What is its energy there (potential + kinetic)? What about P then?
     
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