Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Pendulum type angle question

  1. Feb 24, 2010 #1
    ******I figured it out********

    Tarzan, who weighs 678 N, swings from a cliff at the end of a convenient vine that is 25.0 m long (see the figure). From the top of the cliff to the bottom of the swing, he descends by 3.2 m. If the vine doesn't break, what is the maximum of the tension in the vine?

    The vine will break if the force on it exceeds 805.4 N. Does the vine break? If yes, at what angle does it break (if no enter 180. deg)?

    1. The problem statement, all variables and given/known data

    2. Relevant equations
    mv^2/r=centripetal force

    3. The attempt at a solution
    I solved for the max tension and got 852 N
    I tried to draw triangles and couldn't get the right answer

    My friend said the equation should be cos(angle)=2/3(1-h/r)+1/3(T/mg) but either thats wrong or I'm plugging in wrong
    Last edited: Feb 24, 2010
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted