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Homework Help: Kinetic Energy

  1. Nov 4, 2005 #1
    Hi, i'm having difficulty figuring out the radius for this problem, I need the radius in order to figure out the kinetic energy:

    A wheel has a thin 2.8 kg rim and four spokes each of mass 1.4 kg. Find the kinetic energy of the wheel when it rolls at 6 m/s on a horizontal surface.

    I know that the I = 4(1/3 MR^2) + MR^2 and K = 1/2Mv^2 + 1/2Iw^2.

    Anybody know how to figure out the radius, THANK YOU?
  2. jcsd
  3. Nov 4, 2005 #2
    Please try working out the answer, leaving R as a variable. What do you get?

    Hope this helps...
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