A stepped shaft ABC consisting of two solid, circular segments is subjected to uniformly distributed torque $t_1$ acting over segment $1$ and concentrated torque $T_2$ applied at $C,$ as shown in the figure.Segment $1$ of the shaft has a diameter of $d_1=57$ mm and length of $L_1=0\mathrm{.}75m$; segment $2$ has a diameter $d_2=44mm$ and length $L_2=0\mathrm{.}5m.$ Torque intensity $t_1=3100N\frac{m}{m}$ and $T_2=1100Nm.$ Determine $($a$)$ reaction forces, $(2)$ internal forces at the midsection of $($b$)$ rod $AB,($c$)$ rod $BC.$