Problem $5.(20$ points$)$ Rod $AB$ is made of steel psi$),$ and rod $BD$ is made of aluminum $(E=10\mathrm{.}4{10}^6).$ If force $Q=20$kips,$R=5$kips and $P=5$kips,

find the deflections of points $B$ and $D.$

find the normal stress in rodAB

$\backslash$table$[[A,],[,],[3$ in diameter,$]]$