$\mathrm{.}11$ A solid circular section is attached to a circular tube as shown below. Determine the maximum shear stress in each part of the member when the bracket supports the loading as shown. The right end sets in a bearing that allows rotation. The outside diameter of the shaft is $1\mathrm{.}50$ inches or $40$ mm $.$ The inside diameter of the tube is $1\mathrm{.}25$ inches or $32$ mm $.$ Determine whether the shaft is adequate if $F_{}=0\mathrm{.}40F_y$ and if the maximum angle of twist must be less than $2\mathrm{.}5.$ Both sections are made from A$36$ steel.

$($c$)P=3\mathrm{.}75kN,L=0\mathrm{.}20m$

P$9\mathrm{.}11$