Consider section $a-a$ in the loaded cantilever beam that has an inverted Tshape cross section. Use the following data: $($i$)$ Location of the centroid is $\frac{?}{\text{b}\text{a}\text{r}}(Y)=17\mathrm{.}5mm$ from the bottom of the cross section. $($ii$)$ The moment of inertia about the horizontal centroidal axis is $I=372500m{m}^4.$

$19.$ Determine the transverse shear stress at point $b.$

${}_b=q,$ MPa

$20.$ Determine the maximum transverse shear stress on thE cross section