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Angular momentum question

  1. Apr 16, 2014 #1
    1. The problem statement, all variables and given/known data

    http://postimg.org/image/qghh7y1vr/ [Broken]

    can someone explain why angular momentum is conserved about O?


    2. Relevant equations

    M(P) = d/dt (h(P)) + v(P) x mv(G)

    h(P) = I(G)w + r(G/P) x mv(G)

    3. The attempt at a solution


    edit: nvm, I got it
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Apr 17, 2014 #2

    Simon Bridge

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    ... without looking: because that's the Law.

    <looking>
    What makes you think it might not be?
     
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