$($Aspect ratio is not to scale, with these dimensions it would be more slender.$)$

$($a$)$ Identify the zero$-$force mmebers in the truss, if any. $(7)$

$($b$)$ Calculate the reactions at rocker $\backslash ($ A $\backslash )$ and pin $\backslash ($ C $\backslash ).(10)$

$($c$)$ Calculate the force in member $\backslash ($ D G $\backslash )$ in the tower shown on the left. Is it in compression or tension? $(12)$

$($d$)$ Suppose the mid$-$level diagonal brace is switched as shown on the right. How does the force in member $\backslash ($ E F $\backslash )$ on the right compare to the force in $\backslash ($ D G $\backslash )$ in the left tower? $\backslash ((9)\backslash )$