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Homework Help: Find mass of uniform solid disk?

  1. Nov 5, 2007 #1
    you need to design an industrial turntable that is 48.0 cm in diameter and has a kinetic energy of 0.300 J when turning at 31.0 rpm

    i found that inertia of the turntable about the rotation axis
    is = 5.71×10^-2 kg m^2

    If your workshop makes this turntable in the shape of a uniform solid disk, what must be its mass?

    it try to use I=mr^2
    so mass = I/r^2

    but that don't work
  2. jcsd
  3. Nov 5, 2007 #2


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  4. Nov 5, 2007 #3
    Woot it work thank you
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