*10-68. A rod is made from two segments: AB is steel and BC is brass. It is fixed at its ends and subjected to a torque of T = 680 N-m. If the steel portion has a diameter of 30 mm, determine the required diameter of the brass portion so the reactions at the walls will be the same. Ga = 75 GPa, Ge = 39 GPa. 10-69. Determine the absolute maximum shear stress in the shaft of Prob. 10-68. i.60m 680 N-m 0.75 m

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