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Homework Help: Potential Energy

  1. Nov 5, 2006 #1
    A person with mass,m, is suspended by 2 ropes (paralell) both of length l. The person begins on a platform in the air. The person steps off the platform, starting from rest with the rope at an angle beta, with respect the the verticle. Air resistance is negligable.
    a) When the ropes make an angle theta with the verticle, the person must exert a force of: mg(3 cos(theta) -2 cos(beta)).
    b) Find the angle beta where the force needed to hang on at the bottom of the swing is twice the persons weight.

    Any help is appreciated. Thanks
  2. jcsd
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