Problem $1(10$ points$)$

A $120$ N force is applied at point D of a bracket

bolted to channel AB$.$ The $120$ N force is applied

parallel to the $y-z$ plane. Determine:

a$)$ the moment of the force with respect to

point $A,$

b$)$ the moment of the force about the axis $AC,$

c$)$ the perpendicular distance $s$ from the line

of action of the force to point $A.$