Extracted text: Problem (4.4): The aluminum-alloy shaft AC in Figure (4.25) (G= 26 GPa) has an 800- mm-long solid segment AB and a 400-mm-long tubular segment BC. The shaft is subjected to the torsional loading shown in the figure. The diameters are di=(d.)2 = 50 mm and (d;)2 = 20 mm. (a) Determine the maximum shear stress in the shaft, and identify the location (s) where this maximum shear stress occurs. (b) Determine the angle of rotation at B. Øg. and the angle of rotation at C. Øc. 8 kN-m 800 mm Cp) B 3 kN-m 400 mm (di)2