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Homework Help: Net torque for a frictionless pulley

  1. Nov 5, 2009 #1
    1. The problem statement, all variables and given/known data
    A light rope passes over a light frictionless pulley. One end is fastened to a bunch of bananas of mass m, and a monkey of mass m clings to the other end of the rope. The monkey climbs the rope in an attempt to reach the bananas.
    (a) Treating the system as consisting of the monkey, bananas, rope, and pulley, evaluate the net torque about the pulley axis.
    (b) Using the results to (a), determine the total angular momentum about the pulley axis and describe the motion of the system. Will the monkey reach the bananas?
    http://img190.imageshack.us/img190/1090/88950080.jpg [Broken]

    2. Relevant equations
    torque = FR

    3. The attempt at a solution
    a. (Wbanana - Wmonkey)R
    would that be right?

    The angular momentum of Mmonkey is Mm*r2*v/r
    and Mbanana is Mb*r2*v/r

    and the pulley I*v/r

    adding up

    are my answers correct?
    Last edited by a moderator: May 4, 2017
  2. jcsd
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