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Homework Help: Physics maximum speed help

  1. Oct 9, 2006 #1
    i have one question that i need help on

    Tarzan plans to cross a gorge by swinging in an arc from a hanging vine (Fig. 5-41). If his arms are capable of exerting a force of 2000 N on the rope, what is the maximum speed he can tolerate at the lowest point of his swing? His mass is 70 kg and the vine is 4.8 m long.

    i diont know how to start and what formulas to use
    can someone please help me
  2. jcsd
  3. Oct 9, 2006 #2


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    Homework Helper

    Welcome to PhysicsForums Jordan. Hope we can help you with some of your physics problems.

    Tarzan will swing along a circular path if he hangs onto the vine. His speed will increase towards the bottom and will be a maximum at the lowest point. Motion in a circle requires that a centripetal force be exerted on Tarzan. Now according to Newton's third law if he exerts a 2000 N pulling force on the vine (he needs to pull himself up on the vine) the vine will exert a force of similar magnitude on him. This force is the centripetal force that will help him to swing along a circular path. Do you now how the centripetal force will be related to his speed? Or his centripetal acceleration?
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