Problem $1$

For the beam cross section shown in Fig. $8-1$:

$($a$)$ Determine the maximum tensile stress produced by a moment $M=4$ kip$-$ft$.$

$($b$)$ Accurately sketch a three$-$dimensional view of the stress distribution on the cross section, calculating and indicating the stress values along the neutral axis, and along the inner and outer edge of each flange.