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Homework Help: Rotation, Steiner

  1. Jun 11, 2007 #1
    1. The problem statement, all variables and given/known data

    Consider a spere with momenta of inertia of 2/5*m*r^2 that rolls down a plane surface (no friction). I want to calculate the rotational energy of the sphere when it has speed v0.

    2. Relevant equations

    Erot=1/2*I*w^2

    3. The attempt at a solution

    My only problem is: Do I need to transform my I=2/5*m*r^2 with the rule of steiner, or don't I have to use the rule of Steiner? I would say no.
     
  2. jcsd
  3. Jun 11, 2007 #2
    I'm so confused because sometimes Steiner's theorem isn't used and sometimes it is used for rolling objects. Can you please generalize, when I have to use Steiner's theorem for rolling objects? Would be really helpful.
     
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