Extracted text: The aluminum-alloy shaft AC has a 400-mm-long tubular section AB and an 800-mm-long solid segment BC. The shaft is subjected to a 10 kN.m external torque at section B, and it is fixed to rigid supports at ends A and C. The diameters are (d.)1 = dz= 60 mm and (d)1 = 30 mm. Let G= 26 GPa, Determine a) The reactions at fixed supports A and C (TA & Tc) b) The angle of twist (rotation) at joint B (On). %3D %3! 10 kN m (d (2) (1) (d), B 800 mm 400 mm