Please help me solve this. $(3)$ The plank below weighs $4\mathrm{.}0$ N $.$ Note that the center of mass of the plank is located $1\mathrm{.}5$ m from the pivot. Find the net torque $(\backslash (\backslash$mathrm$\{$N$\}\backslash$cdot $\backslash$mathrm$\{$m$\}\backslash ))$ and rotation sense cw or ccw$.$

$($a$)\backslash (45,\backslash$mathrm$\{$ccw$\}\backslash )$

$($b$)66,$ cw

$($c$)21,$ ccw

$($d$)\backslash (45,\backslash$mathrm$\{$cw$\}\backslash )$

$($e$)66,$ ccw

$($f$)21,$ cw