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

stress at $b.$

Internal reaction force

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

Centroid location

Moment of inertia

The centroidal moment of Inertia of the cross$-$section is given as

First moment of the area at $b$

For a cut at B$,$ the magnitude of the flrst moment of the area of the cutout is SOLVE THE ENTIRE PROBLEM INCLUDING THE LAST PART