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Toque center mass question

  1. Mar 12, 2009 #1
  2. jcsd
  3. Mar 12, 2009 #2

    HallsofIvy

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    I= I+ mr^2 makes no sense. It is equivalent to mr^2= 0.
     
  4. Mar 12, 2009 #3

    tiny-tim

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    Hi transgalactic! :smile:
    First, it's Steiner's law … and nearly everyone calls it the Parallel Axis theorem anyway :wink:

    Second, it's I = IC + mr2, where IC is the moment of inertia about a parallel axis through the centre of mass


    In the second question, the centre of mass doesn't change, so I don't see how they can be using Steiner's law
     
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