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Homework Help: Finding tension of a swinging mass

  1. Oct 17, 2012 #1
    1. The problem statement, all variables and given/known data
    A m = 5kg monkey swings on a vine the length l = 4m. His initial angle is theta = 25 degrees and he is moving at v = 2 m/s at the instant he begins his swing.
    a. What is the tension in the string at the bottom?
    b. What is the tension in the string at theta = 15 degrees?
    Here's a picture of the diagram, not necessary but makes it easier

    2. Relevant equations
    I'm not really sure but here's a few.
    k = (1/2)mv^2 + mgh
    u = mgh

    3. The attempt at a solution
    I have no idea how to involve the theta into the equation, so I can't even really get started. Sorry for being so bad at physics :( If it helps, at the moment we're learning about the conservation of energy, in kinetic and potential energy. Thank you for reading.
  2. jcsd
  3. Oct 18, 2012 #2
    Do You know the meaning of equations you wrote?
  4. Oct 18, 2012 #3
    Start with the free body diagram.
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