II$.$ Problems

$3.(21$ points$)$ Determine the maximum normal stress and shear stress on the cross$-$section with internal loadings shown. For $5$ points extra credit, determine the moment of inertia about the other neutral axis for the cross$-$section.

Fiom Bottom

$\frac{?}{\text{b}\text{a}\text{r}}(y)\frac{{\displaystyle \underset{?}{\overset{?}{}}}{y}_A}{{\displaystyle \underset{?}{\overset{?}{}}}A}\frac{(\frac{12}{2})(16*12)-(\frac{8}{2})(4\mathrm{.}8)}{(16*12)-(4-8)}=5\mathrm{.}959$