$4.$ A machine designer wants to ensure that the components of a mechanism will not fail under the applied and inertia loads during operation. To achieve this, the designer must perform force analysis on the mechanism to calculate induced stresses in each member. To this end, once again consider a typical configuration of a crank and slotted$-$lever mechanism with dimensions $($in mm$)$: the AB$=12\backslash \%$ OC$=700\_\{*\}$ and CD$=100$ as shown in Fig $2$ Given an external force F$=200$~N acting on the slider $($link $(6),$ determine the torque required to be applied to the crank for the static equilibrium of the mechanism. Also, list the magnitude and direction of all the forces acting on each link of the mechanism.

$(10+6+21$