solve $4\mathrm{.}43$ show all work

$4\mathrm{.}43$ and $4\mathrm{.}44$ For the composite beam indicated, determine the

radius of curvature caused by the couple of moment $1500N*m.$

$4\mathrm{.}43$ Beam of Prob. $4\mathrm{.}39.$

$4\mathrm{.}44$ Beam of Prob. $4\mathrm{.}40.$