A wall$-$mounted jib crane is shown. Overall dimensions of the crane are $a=103in.,b=52in,c=60in,$ and $e=4\mathrm{.}0in.$ The cross$-$sectional dimensions of the crane rail are $b_f=4\mathrm{.}2in.,t_f=0\mathrm{.}40in.,d=4\mathrm{.}9in,$ and $t_w=0\mathrm{.}25in.$ Assume that a hoist load of $P=2500lb$ is located as shown. What is the maximum normal stress in the crane rail? Enter your answer with the correct sign.

Answer:

${}_{\text{m}\text{a}\text{x}}=$ psi