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Homework Help: Angular Acceleration of a system.

  1. Oct 2, 2008 #1
    1. The problem statement, all variables and given/known data

    Two pulley wheels, or respective radii R1 =
    0.34 m and R2 = 0.64 m are mounted rigidly
    on a common axle and clamped together. The
    combined moment of inertia of the two wheels
    is I + 1.2 kg*m^2.
    Mass m1 = 25 kg is attached to a cord
    wrapped around the first wheel, and another
    mass m2 = 19 kg is attached to another cord
    wrapped around the second wheel.

    The acceleration of gravity is 9.8 m/s^2 :
    Find the angular acceleration of the system.
    Take clockwise direction as positive. Answer
    in units of rad/s^2.

    2. Relevant equations

    3. The attempt at a solution
    im not sure how to go about solving this.

    Attached Files:

  2. jcsd
  3. Oct 3, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi myr10! Welcome to PF! :smile:

    (have a squared: ² and an omega: ω :smile:)

    (I assume you meant to type I = 1.2 kg*m²)

    Hint: what is the torque of the tensions in the two cords? :wink:
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