Q$1.[0\mathrm{.}6\backslash \%]$

The cantilever beam $\backslash ($ A B $\backslash )$ has a rectangular cross section as shown. If the tension in the cable BD is $10\mathrm{.}4$ kN $,$ neglecting the weight of the beam, determine $($a$)$ the normal stress and $($b$)$ the shearing stress at the $3$ points $\backslash (\backslash$mathrm$\{$a$\},\backslash$mathrm$\{$b$\}\backslash )$ and c $.$