P-7. The steel shaft shown in the figure rotates at 6.40 Hz with 42 kW taken off at A, 27 kW removed at B, and 69 kW applied at C. Using G = 110 GPa. The shear stress developed @ BC is_ MPa A B 55 mm ¢ 65 mm 4 m 2 m O 12.173 16.747 20.505 25.942 31.821
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