Please double check your answer please!

For brass, G $=41$GPa. Neglect the effect of any stress concentrations.

Determine the smallest diameters $d_{AB}$ and $d_{BC}$ for which an allowable shear stress of $65$MPa is not exceeded. Express

each diameter as an integer in units of $mm.$

$d_{AB}=,mm$

$d_{BC}=,|mm$

Determine the magnitude of the total angle of twist in the shaft caused by the two applied torques for the diameters found

previously. Express your result in units of radians with five decimal places of accuracy.

${}_{AC}=,$rad