For a certain wind speed, the wind turbine-generator shown produces 28 kW of electric power and…

For a certain wind speed, the wind turbine-generator shown produces 28 kW of electric power and has an efficiency of 0.35 as an energy-conversion system. Assuming r = 1.21 kg/m3 for air, determine (a) the kinetic energy of the air particles entering the 7.50-m-diameter circle per second, (b) the wind speed.

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