The A-36 hollow steel shaft is 2 m long and has an outer diameter of 40 mm. When it is rotating at 80 rad/s, it transmits 32 kW of power from the engine E to the generator G. Determine the smallest thickness of the shaft if the allowable shear stress is Ï„_allow= 140 MPa and the shaft is restricted not to twist more than 0.05 rad.

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E G