Can someone explain this proof of the moment of inertia of a sphere? And how you can use the same principals to solve for other formulas?(adsbygoogle = window.adsbygoogle || []).push({});

https://www.physicsforums.com/attachment.php?attachmentid=62987&stc=1&d=1381895479http://

I understand each individual variable. But I don't understand how they were able to get the moment of inertia by the orginal integrand, and where did that integrand come from?

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# Using Calculus To Derive Forumlas

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