A steppted shaft ACB having solid circular cross sections with different diameters is held against rotation at the ends.

If the allowable shear stress in the shaft is $40$ MPa $,$ what is the maximum torque $T_{0_{\text{m}\text{a}\text{x}}}$ applied at section $C?$

Find $T_{0_{\text{m}\text{a}\text{x}}}$ if the maximum angle of twist is $0\mathrm{.}55.$ Let $G=79$GPa

$T_{0_{\text{m}\text{a}\text{x}1}}=$

$Nm$

$T_{0_{ma{x}_2}}=$

$Nm$