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Old Sep 18, 2012, 11:43 AM
DPATE is offline
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Grad student in aeronautics
United States, GA, Atlanta
Joined Oct 2010
525 Posts
It's D for David. Feel free to call me David.

Because we define lift to be the force perpendicular to the free stream velocity, and because a force acting perpendicular to the motion of a body does no work on that body, lift does no work.
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