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1) POWER in the wind: (P, watts) Is proportional to the cube( 3 ) of: p = air density A = area intercepting wind; v = instantaneous wind velocity r = blade.
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Dr Jehad Yamin 1. 2 3 4 1 A.D. ◦ Hero of Alexandria uses a wind machine to power an organ ~ 400 A.D. ◦ Wind driven Buddhist prayer wheels 1200.
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