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Homework Help: Tension and Normal Forces

  1. Sep 29, 2011 #1
    1. The problem statement, all variables and given/known data
    Find the magnitude F of the force that the man must pull up on the rope, in order to
    support himself and the platform at a xed position in mid-air (the rope is attached to a
    ceiling above the man). Solve for F for a man of arbitrary mass M, and a platform of
    arbitrary mass m (which includes the mass of the pulley).

    2. Relevant equations


    3. The attempt at a solution

    Obviously we should use F=ma and plug tension and normal force somewhere, I have no idea what and where to plug it in though, help!
  2. jcsd
  3. Sep 29, 2011 #2
    Drawing a diagram is important. Then one can discuss the problem.
    The important point here is to be very carefull to what part of the system F=ma is applied.
  4. Sep 29, 2011 #3
    this kind of problem always has a diagram, please draw it or attach a copy
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