b$)$ Determine the force P needed to hold the cable in the position shown in Fig.Q$3($a$)$ below, i$.$e$.,$ so that segment BC remains horizontal. Also compute the sag $y_B$ and the maximum tension in the cable.

$(15$ marks$)$

c$)$ A pin$-$connected truss supports lateral loads as shown in Fig. $3\mathrm{.}2$ below. Determine the axial forces in the members BD$,$ CD$,$ DE and EG of the truss. State whether the members are under tension or compression.

$(10$ marks$)$