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A hollow shaft of 60 mm outer diameter transmits 180 kW of power while rotating at a frequency of 25 hertz. Find the thickness

A hollow shaft of 60 mm outer diameter transmits 180 kW of power while rotating at a frequency of 25 hertz. Find the thickness of the shaft so that the shear stress does not exceed 60 N/mm (a) 3.82 mm (c) 4.07 mm (b) 3.98 mm (d) 4.17 mm

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