$3$

$\frac{0}{1}$ point

The elbow member shown is fixed on one end and subjected to the force $P.$

The member is constructed from an aluminum plate having a thickness of $0\mathrm{.}75$ in $.$

For $b=7\mathrm{.}7in.$ and $P=19$ kip,

determine the magnitude of the resultant bending moment $M$ on the cross section of point $D.[$kip$-$in$]$