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Homework Help: Finding angular acceleration of 2 masses on a rod

  1. Apr 29, 2010 #1
    1. The problem statement, all variables and given/known data

    A uniform rigid rod with mass Mr = 5.9 kg, length L = 2.9 m rotates in the vertical xy plane about a frictionless pivot through its center. Two point-like particles m1 and m2, with masses m1 = 5.7 kg and m2 = 1.8 kg, are attached at the ends of the rod. What is the magnitude of the angular acceleration of the system when the rod makes an angle of 42.7° with the horizontal?

    2. Relevant equations

    all i know is that I= 1/12ML^2

    3. The attempt at a solution

    I honestly dont know where to star, could anyone guide me towards the right way
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 30, 2010 #2

    vela

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    Start by drawing a free-body diagram and identifying the forces on the rod.
     
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