I've been doing moment of inertia problems and haven't had any trouble so far until these:(adsbygoogle = window.adsbygoogle || []).push({});

Using integration, find the moment of inertia of a rod about an axis through its center if the mass per unit length is [tex]\lambda=\lambda_o x[/tex]. The answer is supposed to come out to [tex]I=\frac 1 8 ML^2[/tex].

Using integration, find the moment of inertia of a disk of radius [tex] a [/tex], about its center if a) [tex]\sigma=\sigma_o r^{-1} [/tex] b) [tex]\sigma=\sigma_o r^2[/tex]. The answers are a) [tex]I=\frac 1 3 Ma^2[/tex] b) [tex]I=\frac 2 3 Ma^2 [/tex]

Even with the answer I'm confused . Please please help me out....thank you.

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# Moment of inertia, huh?

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