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Homework Help: Pendulum problem

  1. Apr 24, 2010 #1
    1. The problem statement, all variables and given/known data

    a 2 kg pendulum of length 7 meters is moving at 1 m/s, calculate how high (h) the pendulum will rise; and the resultant angle.

    2. Relevant equations
    1/2mv2 = mgh

    cos = Y/L

    h = L ( 1- cos )

    3. The attempt at a solution

    1/2(2)(1)^2 = (2)(9.8) h
    1 = 19.6h
    h = .051

    just dont know how to go about gettign resultant angle
    Last edited: Apr 24, 2010
  2. jcsd
  3. Apr 24, 2010 #2


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    Homework Helper

    Have you tried drawing a diagram and writing out a trigonometric relationship using that diagram?
  4. Apr 24, 2010 #3
    yeah i did and got h= 7 tan[tex]\theta[/tex], how would you find the actual angle that what im having difficult with.
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