ch13-p074 - 74. The key point here is that angular momentum...

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74. The key point here is that angular momentum is conserved: I p ω p = I a a which leads to 2 (/) pa p a rr ωω = , but r p = 2 a r a where a is determined by Eq. 13-34 (particularly, see the paragraph after that equation in the textbook).
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