Required information

For the beam and loading shown, consider section $\backslash ($ n$-$n $\backslash ).$ Given: $\backslash ($ P$=160\backslash$mathrm$\{$kN$\}\backslash ).$

Determine the shearing stress at point $\backslash ($ a $\backslash ).$

The shearing stress at point $\backslash ($ a $\backslash )$ is