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Homework Help: Atwood machine with two holes in pulley.

  1. Jul 11, 2012 #1
    1. The problem statement, all variables and given/known data
    A system consists of a pulley and two masses m1, m2 haning from it as shown in the figure. The pulley is a disk of radius R with constant mass density that has two circular hole with radius R/2. Find the angular acceleration of the pulley.

    Figure attached.

    2. Relevant equations

    3. The attempt at a solution
    The solution is attached.

    I'm not interested in knowing if my calculation for the moment of inertia is correct which is found at the bottom of the solution.

    Attached Files:

  2. jcsd
  3. Jul 12, 2012 #2


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    In the first equation for I at the bottom of the page, shouldn't the last term be negative? (Never mind, I missed seeing a set of parentheses!)

    It all looks good to me.
  4. Jul 12, 2012 #3
    Ooops I made a typo. I meant to say that I'm interested in knowing whether or not my moment of inertia is correct.

    Oh cool TSny you read it how I meant it.
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