Prob. $2\mathrm{.}2-3.$ A steel plate is welded onto each end of the

structural angle in Fig. P$2\mathrm{.}2-3$ so that a load can be applied

at point $R,$ where it will produce uniform axial stress in

the member. $($a$)$ Determine the coordinates $y_R$ and $z_R$ of

the point where the tensile load $P$ must act in order to

produce uniform tensile stress in the cross section of the

structural angle, and $($b$)$ determine the magnitude of that

tensile stress if $P=80kN.$

$($a$)$

$($b$)$