Problem $7-2.$ Use the one$-$half and one$-$

sixth rules to idealize the wing$-$box cross

section, shown below, as a skin$-$stringer

model; draw a sketch of the idealized model.

Calculate the centroid location and

centroidal $2^{nd}$ area moments and product of

the idealized cross section. The skin and

web thickness is a constant ${0\mathrm{.}10}^{\text{'}\text{'}}.$

$4$ in ${?}^2$

$1$ in ${?}^2$

$2$ in ${?}^2$

Please calculate the centroid location and centroidal $2$nd area moments and product of idealized cross section.