Wind is a useful source of energy for generating electrical power for people who live in heavily mountainous regions. Modern windmills have an overall efficiency of 40%; that is, 40% of the energy in the wind hitting the blades can be converted to electrical energy. What blade length would be needed to generate 5.00 kW in a 50.0 km h' wind? Density of air is 1.2 kg m.

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Estimate of calculation