PROBLEM 3.82 A 1.5-m-long tubular steel shaft (G ? 77.2 GPa) of 38-mm outer diameter d1 and 30-mm inner diameter d2 is to transmit 100 kW between a turbine and a generator. Knowing that the allowable shearing stress is 60 MPa and that the angle of twist must not exceed 3°, determine the minimum frequency at which the shaft can rotate.
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