SITUATION $6-$

Given the following data for the beam shown in Figure $85-12$:$P=6\mathrm{.}8kN,L=3\mathrm{.}6m,d=1\mathrm{.}25m,b=80mm,t=25mm$

$h=125mm,$ and $h_1=90mm.$ Calculate the following:

$16.$ The centroidal moment of inertia $I_x$ of the beam in $m{m}^4.$

A$.6\mathrm{.}9{10}^3$

C$.7\mathrm{.}3{10}^3$

B$.8\mathrm{.}2{10}^3$

D$.6\mathrm{.}7{10}^3$

$17.$ The maximum tensile stress in the beam in MPa.

A$.42\mathrm{.}3$

C$.32\mathrm{.}4$

B$.35\mathrm{.}1$

D$.37\mathrm{.}7$

$18.$ The maximum compressive stress in the beam in MPa.

A$.66\mathrm{.}2$

C$.62\mathrm{.}8$

B$.69\mathrm{.}5$

D$.61\mathrm{.}1$