a$)$ The rigid pipe is supported by a pin at $\backslash ($ A $\backslash )$ and an A$-36$ steel guy wire BD$.$ If the wire has a diameter of $10$ mm $.,$ determine how much it stretches when a load of $\backslash ($ P$=6\backslash$mathrm$\{$kN$\}\backslash )$ acts on the pipe.

b$)$ The rigid pipe is supported by a pin at A and an A$-36$ guy wire BD$.$ If the wire has a diameter of $10$ mm $,$ determine the load $\backslash ($ P $\backslash )$ if the end $\backslash ($ C $\backslash )$ is displaced $1\mathrm{.}5$ mm $.$ downward.

$\backslash (\backslash$mathrm$\{$E$\}=200\backslash$mathrm$\{$Gpa$\}\backslash ).$