Figure $1$: Cross$-$section of structural member

$5\mathrm{.}1.$ Referring to points $1,2$ and $3$ shown in the figure above:

a$.$ Calculate the normal stresses due to the applied bending moment and the shear stress due to

the applied shear force at points $1,2$ and $3.$

b$.$ Draw the normal stress distribution and shear stress distribution over the cross$-$section. $[6]$

c$.$ Calculate the principal stresses at points $1,2$ and $3.$