Required information

Consider the beam and loading shown. If $a=8in,b=7\mathrm{.}0in,c=1$ in$.$ For a section at $n-n,$ determine the shear stress at b $.$

Internal reaction force

Using the FBDs and associated equlibrium equations, $A_y=B_y=V=25($kip$).$

Centroid location

The centroid for the cross section is located

$($in$)$ from the base $($bottom of the cross$-$section$)$