Problem $8\mathrm{.}18$:

The joint is subjected to a force of $250$

lbs as shown. Determine the state of

stress at point A and B and sketch the

results on differential elements located

at these points. The member has a

rectangular cross$-$sectional area of

width $($height$)0\mathrm{.}5$ inches and thickness

$($depth$)$ of $0\mathrm{.}75$ inches.