maximum shear stress due to $V.$ The parameters are $a=5$ in$,b=15in,c=0\mathrm{.}775in,h=2in,F_1=3200lbf,$ and $F_2=1000lbf.$

The moment of inertia is $,$ in ${?}^4.$

The maximum tensile bending stress due to $M$ is psi.

The maximum shear stress due to $V$ is psi.