Beers $3\mathrm{.}55($Statically indeterminate shaft$)$

Two solid steel shafts $(G=77\mathrm{.}2$GPa $)$ are connected to a

coupling disk B and to fixed supports at A and $C.$ For the

loading shown, determine $(a)$ the reaction at each

support, $($b$)$ the maximum shearing stress in shaft AB$,($c$)$

the maximum shearing stress in shaft BC$.$