Q21 (a) 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 mass of the air passing through it in time t?
The volume of wind = here is the swept circle and is the velocity.
Thus the mass of the wind is : - , is the density of the air.
Hence mass of wind flowing through windmill in time t is .
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