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Force and Motion PLEASE HELP!

  1. Oct 27, 2008 #1
    1. THE PROBLEM: A 9 kg monkey climbs up a massless rope that runs over a frictionless tree limb and back down to a 21 kg package on the ground (Fig. 5-54).

    Figure 5-54.

    (a) What is the magnitude of the least acceleration the monkey must have in order to lift the package off the ground?
    m/s2

    Assume that after the package has been lifted, the monkey stops its climb and holds onto the rope.

    (b) What is the monkey's acceleration?
    m/s2
    (c) What is the tension in the rope?
    N


    2.) MY ATTEMPTS: I figured that in order for the monkey to be able to lift the crate its acceleration should be proportional to where the monkey and crate had the same force.
    F=ma=m(Monkey(9))(a)=m(Crate(21))(9.8)
    a=22.876 m/s^2.........according to web assign im wrong! I can solve the other parts of the problem if I knew how to find the first acceleration
    PLEASE HELP :)
     
  2. jcsd
  3. Oct 27, 2008 #2

    Redbelly98

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    (a) To start, I would calculate what the rope tension must be in order to just start lifting the package.
     
  4. Oct 27, 2008 #3
    How would i calculate that? F=ma but the only a i see given is gravity?
     
  5. Oct 28, 2008 #4

    Redbelly98

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    Well, to put it another way: what would be the force required to lift anything off of the ground?
     
  6. Oct 28, 2008 #5
    F = ma is key. And there IS another a apart from gravity. Hmmm, what could be accelerating in the problem?
     
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