Answer
$I_{y}=\frac{1}{3}ml^{2}$
Work Step by Step
$I_{y}=\int x^{2}dm=\int x^2(\rho A dx)= \frac{1}{3} \rho A l^3$
$m=\rho A l$
$I_{y}=\frac{1}{3}ml^{2}$
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