Problem $2$: Consider the structure below, where a force $P=500lb$ is applied to a rigid

plate connecting three elastic axial members: AB$,$ CD$,$ and EF$.$ The modulus of elasticity

of these members is $E=29000$ksi. The diameters are as follows: $D_1=\frac{1}{16}$ in$.$ for members

$AB$ and $EF,$ and $D_2=\frac{1}{32}in.$ for member $CD.$ For axial member $CD,$ calculate: $($a$)$ the

axial deformation ${}_{CD}$ and $($b$)$ the axial force $F_{CD}.$