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A solid alloy shaft of 50 mm diameter is coupled in series with a hollow steel...

A solid alloy shaft of 50 mm diameter is coupled in series with a hollow steel shaft of same external diameter. Determine the internal diameter of the hollow steel shaft if the angle of twist per unit length in hollow shaft is 75% of that of the solid alloy shaft. Also, determine the speed at which the compound shaft must be driven to transmit 200 kW, if the limiting shear stresses are 55 MPa and 75 MPa in alloy and steel shafts respectively. Take Gsteel = 2.2 Galloy

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