58 A wind turbine is rotating at 15 rpm under steady vinds flowing through the turbine at a rate of 42,000 kg/s. The tip velocity of the turbine blade is measured to be 250 m/h. If 180 kW power is produced by the turbine, determine a) the average velocity of the air and (b) the conversion effi- iency of the turbine. Take the density of air to be 1.31 g/m³.

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