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Wind Energy

53.The blades...

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53.The blades of a windmill sweep out a circle of area A. If wind flows with a velocity v perpendicular to the blades of the windmill and its density is d, then the mechanical power received by the windmill?

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Q. The blades of a windmill sweep out a circle of area A. If the wind flows at a velocity v perpendicular to the circle and its density is

ρ

, what is the mechanical power received by the windmill?

Q. The blades of a windmill sweep out a circle of area

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. If the wind flows at a velocity

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perpendicular to the circle, then the mass of the air of density

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Q. The blades of a wind mill sweep out a circle of area A. If wind flows with velocity v perpendicular to blades of wind mill and its density is

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Q. The blades of a windmill sweep out a circle of area A.
(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?
(b) What is the kinetic energy of the air?
(c) Assume that the windmill converts 25% of the winds energy into electrical energy, and that A = 30

m^{2}

, v = 36 km/h and the density of air is 1.2 kg

m^{3}

. What is the electrical power produced?

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