Example $6\mathrm{.}8$: For the beam cross section shown in Fig. $6\mathrm{.}20,$ subjected to a shearing force of $100$kN$,$ calculate the following: a$)$ the maximum shear stress b$)$ the shear stress at the junction of the web and the flange c$)$ the shear stress distribution

$($b$)Q$ for N$.$A$.$

$($a$)$ Cross$-$Section

Fig. $6\mathrm{.}20.$ Beam Cross$-$Section for Example $6\mathrm{.}8.$