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Constrained pully system

  1. Apr 7, 2015 #1
    1. The problem statement, all variables and given/known data
    A,B,C are of mass one kg each, while D,E are massless pulleys.
    https://docs.google.com/file/d/0B0FIIKckKOcKN2JxcS1DYldaX0U/edit?usp=docslist_api
    We need to find Tension in string, acceleration of A,B,C

    2. Relevant equations

    T-mg=ma

    3. The attempt at a solution
    I tried getting tension and got T=2T, which gives T=0, which is not the answer. Thanks in advance
     
  2. jcsd
  3. Apr 7, 2015 #2
  4. Apr 7, 2015 #3

    haruspex

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    Sounds to me as though you assumed no acceleration.
    Can't tell where you are wrong if you don't post your working.
     
  5. Apr 7, 2015 #4
    I actually couldn't get anything, any hint on which I can work on?
     
  6. Apr 7, 2015 #5

    haruspex

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    You wrote that you did some work and got T=2T. Please post that work. You must show some attempt, even if it is just some thoughts.
    Have you drawn a free body diagram for each pulley? Each of those should give you an equation, though some may be uninteresting because they involve unknown forces from outside the system.
     
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