A shaft of radius c = 0.75 in. is made from an elastic perfectly plastic material as shown. Determine the torque T that must be applied to its ends so that it has an elastic core of radius ρ = 0.6 in. If the shaft is 30 in. long, determine the angle of twist.

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T. 30 in. т (ksi) 3 Y (гad) 0.006