Question $18$

A bronze $E=15,200$ksi bar is rigidly attached to a stainless steel $E=27,500$ksi bar to form a composite beam. The composite beam is subjected to a bending moment $M=6,400lb*ft$ about the $z$ axis. The dimensions of the beam cross section are $b=4\mathrm{.}5$ in$.,dB=2\mathrm{.}25$ in$.,$ and $dS=1\mathrm{.}00$ in$.$ Determine the maximum bending stress in the bronze in psi.

$8420($compression$)$

$8039($tension$)$

$9039($compression$)$

$11540($compression$)$

following item $19,$ find the maximum bending stress of the steel bar in psi.

$11540($tension$)$

$9039($compression$)$

$9039($tension$)$

$10134($tension$)$