Recall this box is made from ${\mathrm{.}05}^{\text{'}\text{'}}$ thick $6061-$T$6$ Aluminum plate that forms a ${36}^{\text{'}\text{'}}$ by ${15}^{\text{'}\text{'}}$ box.

This box is subjected to a $15$ kip up shear force and a $500$ kip$-$in bending moment

$($compression at top$).$ For this assignment consider attaching $\frac{1}{2^{\text{'}\text{'}}}$ by $\frac{1}{8^{\text{'}\text{'}}}$ zee$-$stringers on the

inside surface of the top and bottom skins. The stringer spacing is $2$ inches on center.

Recalculate the bending stresses and the shear flow in the box section with stringers.