$1$

$\frac{0}{1}$ 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 $b=9\mathrm{.}4$ in$.$ and $P=19$ kip,

determine the resultant normal force $N$ on the cross section of point $D.[$kip$]($sign sensitive: positive for tension, negative for compression$)$