A hollow steel $[E=30,000$ksi tube $(1)$ with an outside diameter of $3\mathrm{.}50$ in $.$ and a

wall thickness of $0\mathrm{.}216$ in $.$ is fastened to a solid $2-$in$.-$diameter aluminum

ksi$]$ rod $(2$ and $3).$ The assembly is attached to unyielding supports at the left and

right ends and is loaded with four forces as shown in the figure below. Determine:

$($a$)$ the normal stresses in all parts of the axial structure, i$.$e$.,$ segments $1,2,$ and $3.$

$($b$)$ the displacement of joint $C.$