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Homework Help: Kinetic Energy of a flat uniform disk

  1. Nov 7, 2008 #1
    1. The problem statement, all variables and given/known data

    A flat, uniform, disk, of radius 1.5 m and mass 10 kg, is rolling on its edge with a translational velocity of 12 m/s.
    What is the kinetic energy of the disk?

    2. Relevant equations

    not sure which one but I'm guessing it's one of these two:
    K = .5(I)(w)^2
    K = .5(Icm)(w)^2 + .5(M)(v)^2cm

    3. The attempt at a solution

    I have absolutely no idea how to even start this problem, any help on what eqn to use and what I is would be extremely helpful
  2. jcsd
  3. Nov 7, 2008 #2


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    Science Advisor
    Homework Helper

    For a rolling object - the total energy is the kinetic energy of the moving mass PLUS the rotational energy.
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