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Help Work problem

  1. Oct 27, 2008 #1
    Help!!!Work problem

    1. The problem statement, all variables and given/known data
    A person pulls a heavy load of mass 74kg up the side of a building using a rope and a frictionless pulley. the load travels up 34m with constant velocity. how much work is done by
    a)gravity
    b)tension in the rope
    c)the person
    diagram:
    ---- represents ropes
    pulley---------person
    l
    l
    l
    l
    load

    3. The attempt at a solution
    The load is moving in y direction
    a)F=mg=74*-9.8=-725.2
    Work=force times distance=-725.2x34=-24656.8J
    b)since the tension is same and opposite to the gravity
    therefore, work=725.2x34=24656.8J
    c)x-direction:
    tan(30)=oppo/24656.8J
    oppo=14235.6J
     
  2. jcsd
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