Methodology:

a$)$ Draw a free$-$body diagram $($FBD$)$ of the beam that is needed to calculate the internal resultants at section C $.$

b$)$ Using your FBD$,$ determine the internal resultants of shear force $($ V $)$ and bending moment $($M$)$ on the beam at cross$-$section C located at $\backslash (\backslash$mathrm$\{$x$\}=\backslash$mathrm$\{$L$\}\backslash ).$

c$)$ Calculate the second area moment $\backslash (\backslash$mathrm$\{$I$\}\_\{2$ z$\}\backslash )$ for the beam cross$-$section.

d$)$ Calculate the normal stress at point K of the cross$-$section C $.$

e$)$ Calculate the shear stress at point K of the cross$-$section C $.$

f$)$ Calculate the shear stress at point $\backslash ($ Q $\backslash )$ of the cross$-$section $\backslash ($ C $\backslash ).$