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Angular acceleration given force, moment arm and inertia?

  1. Jun 27, 2013 #1
    1. The problem statement, all variables and given/known data

    Find angular acceleration in deg/sec^2 given the following factors:

    - Total mass: 4889 kg
    - Moment of inertia: 4620 kg*m^2
    - Moment arm length from center of mass: 1.5 meters
    - Force on moment arm tangent to mass: 1779 newtons

    2. Relevant equations

    torque = force * moment arm length
    torque = 1779 newtons * 1.5 meters
    torque = 2668.5 newton-meters

    angular acceleration = torque / moment of inertia

    3. The attempt at a solution

    angular acceleration = 2668.5 N-m / 4620 kg*m^2

    angular acceleration = 0.576 radians/sec^2 = 33.05 degrees/sec^2

    Is this right?
     
  2. jcsd
  3. Jun 27, 2013 #2
    Looks good, except for significant digits.
     
  4. Jun 27, 2013 #3
    Should be 33, yes? i.e. 2 sig figs
     
  5. Jun 27, 2013 #4
    Yep.
     
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