The figure below shows a retaining wall and the active soil wedge drawn to a scale as $AC=7m$ length. The shear strength parameters for soil are $c^{\text{'}}=20k\frac{N}{m^2}$ and ${}^{\text{'}}=35.$ The unit weight of the soil is $18k\frac{N}{m^3}.$ The angle of wall$-$soil friction is $=27,$ and the wall$-$soil cohesion is $c_w=5k\frac{N}{m^2}.($Neglect tension cracks$)$

$($a$)$ Show all the forces acting on the soil wedge with their proper directions.

$($b$)$ Calculate the magnitude of forces acting on the wedge per meter length of the wall due to wall$-$soil cohesion $(C_w),$ soil cohesion $(C),$ and the self$-$weight of the wedge $(W),$ neglecting $)$