Q$\mathrm{.}1.$

a$)$ Draw the Free$-$Body Diagram of the beam given below. $(5$ points$)$

b$)$ Briefly explain what zero$-$force members are in truss systems and why they are used. $(5$ points$)$

c$)$ What is the moment of the $300N$ force acting at point $C$ of the beam shown about the pin support at point $A?(5$ points$)$