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A solid brass $[$E $=99$ GPa$]$ axial member is loaded and supported as shown. Segments $(1)$ and $(2)$ each have a diameter of $26$ mm and segment $(3)$ has a diameter of $15$ mm $.$ Assume $L_1=1\mathrm{.}7m,L_2=1\mathrm{.}2m,L_3=1\mathrm{.}6m,R=36kN,Q=14$ kN $,$ and $P=28kN.$ Determine:

$($a$)$ the deformation of segment $(2).$

$($b$)$ the deflection of joint $D$ with respect to the fixed support at $A.$

$($c$)$ the maximum normal stress in the entire axial member.

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