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Introductory Angular Momentum

  1. Feb 9, 2015 #1
    1. The problem statement, all variables and given/known data
    The 1.8kg , 5.2-cm-diameter disk is rotating as shown. What is the angular momentum of the disk about the axle?

    9-33.jpg
    2. Relevant equations
    L=Iω=(mr^2)ω

    3. The attempt at a solution
    r=.026m
    m=1.8 kg
    ω=600rpm*(1minute/60seconds)*(2pi radians/1rotation) = 62.83 rad/sec

    L=(1.8kg * .026m^2) * 62.83 rad/sec = .076 (kg*m^2/s). I think this is correct, but my online quiz says that the answer is .038. What am I doing wrong?
     
  2. jcsd
  3. Feb 9, 2015 #2

    Nathanael

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    Homework Helper

    What is the rotational inertia of the disk?
     
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