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14. The blades of a wind mill sweep out a circle ofarea A. If wind flows with velocity v perpendicularto blades of wind mill and its density is p, thenthe mechanical power received by wind mill ispAv32pAv22(3) pAv2(4) 2pAv2i5 |
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Answer» Area of the circle swept by the windmill =A Velocity of the wind =v Density of air =ρ Volume of the wind flowing through the windmill per sec =Av Mass ofthe wind flowing through the windmill per sec =ρAv Massm, of the wind flowing through the windmill in timet=ρAvt K.E =1/2*(m)*(v²) = 1/2*(ρAvt)(v²) = 1/2ρAv³t power = energy/time = 1/2ρAv³t/t = 1/2ρAv³ option A |
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