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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. (a) If the wind flows at a velocity `upsilon` perpendicular to the circle, what is the mass of air passing through it in time t? (b) What is K.E. of the air ? (c) Assume that the wind mill converts `25%` of the wind's energy into electrical energy , and that `A=30m^(2), upsilon=36km//h` and the density of air is `1.2kg//m^(3)`. What is electrical power produced ?

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