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

Question

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 p then the mechanical power received by wind mill is PAV 1 2 3 pAv 2 pAv 2 4 2pAv

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