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The blades of a windmill sweep out a cir...

The blades of a windmill sweep out a circle of area A.
Assume that the windmill converts 25% of the wind's energy into electrical energy, and that `A= 30 m^(2), v= 36 km/h` and the density of air is `1.2 kgm^(-3)`. What is the electrical power produced?

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`P= 4.5 kW`
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