How Much Wind Should a Windmill Mill?

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The Solution to the Windmill Paradox. This video is about the tradeoff of Windmills: the fact that the more kinetic energy you extract from the wind the slower the wind goes, the less wind you have to extract energy from, etc. How much energy is the sweet spot to extract from the wind??

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Created by Henry Reich ... https://www.youtube.com/watch?v=CI-bwqhhTTw