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Homework Help: Calculate the rotational inertia of a wheel that has a kinetic energy of 20300 J when

  1. Nov 6, 2005 #1
    Calculate the rotational inertia of a wheel that has a kinetic energy of 20300 J when rotating at 794 rev/min.
    I don't understand this whole rotational inertia thing too well but I thought I found the right equation, but apparently I didn't. I used K = 1/2 * I * w^2
    I converted the 794 rev/min to 13.233 rev/s and plugged the numbers into the equation to get 232. The answer is suppose to be in kg*m*m, but withw being in rev/s I don't know what to do.
     
  2. jcsd
  3. Nov 6, 2005 #2

    Fermat

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    Convert the w to radians per second
     
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