Consider the assembly shown in $($Figure $1).$ Suppose that aa $=1\mathrm{.}5$ ftft $,$ bb $=0\mathrm{.}4$ ftft $,$ rr $=1\mathrm{.}5$ ftft $,$ and dd $=0\mathrm{.}2$ ftft $.$ The material has a specific weight of $=90$ lb$/$ft$3$lb$/$ft$3.$

Figure

$1$ of $1$