For a centrifugal compressor designed to have a stagnation pressure ratio of 3.95, determine an appropriate rotation rate for the shaft (to the nearest ten radians per second) when the power input factor is 1.04, the slip factor is 0.88, the isentropic efficiency is 0.79, the impeller diameter is 0.55m and a typical inlet stagnation temperature is 292K. Take Cp=1.005kJ/kg/K and the ratio of specific heat capacities is 1.4.

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