Answer is given. Give explanation. The $60-$mm$-$diameter A$-36$ steel shaft $(G=28$GPa $)$ is subjgcted to the torques shown. Determine $($a$)$ the maximum shear stress in segment $AB,($b$)$ the shear stregs in member $BC$ at a point midway between its axis and surface, $($c$)$ the angle of twist of end A relative to $B,$ and $($d$)$ the angle of rotation of end $A.$

$($A$)238\mathrm{.}73$

$($B$)11\mathrm{.}979$

$($C$)0\mathrm{.}034$rad

$($D$)-0\mathrm{.}022$rad