A steel [G= 80GPa] shaft consists of a solid 40-mm diameter segment AB and a 60-mm- diameter segment BC. The length of segment Ab and a 60-mm- diameter segment BC. The length of segment AB is 1m and the length of segment BC is 0.5m and the magnitude of the Torque TB is 500 N-m. If the maximum rotation angle at the free end of the shaft must be limited to ∅C ≤ 3?, what is the magnitude of the torque TA that can be applied to A?
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