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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.
If the wind flows at a velocity v perpendicular to the circle, What is the kinetic energy of the air?

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`K.E=(1)/(2)mv^(2)=(1)/(2)xx360xx(36xx(5)/(18))^(2)=18000Js^(-1)`
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