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#2
10-24-2007, 05:22 PM
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Re: GRE study help-classical physics
just a quick glance, your I' looks right since the child is at the center and doesn't add to the rotational inertia
however when you initially calculated I it looks like you just calculated it as if the disk itself was 240 kg total, but it makes a difference that the child is on the end not near the center. 
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