Question B$.3(16$ Marks Total$)$

The rigid pole and cross$-$arm assembly is shown in Figure B$\mathrm{.}3.$ Knowing that the tension in cable $\backslash ($ C D $\backslash )$ is $1\mathrm{.}2$ kN $,$ determine;

$($i$)$ The moment about point $\backslash ($ O $\backslash )$ due to tension in cable $\backslash ($ C D $\backslash )(\backslash (\backslash$mathbf$\{10\}\backslash )$ marks$)$

$($ii$)$ The moment about the pole axis $\backslash ($ O B $\backslash ).(6$ marks$)$

Figure B$\mathrm{.}3.$ A rigid pole and cross$-$arm assemblv.