
In fluid dynamics, d`Alembert`s paradox (or the hydrodynamic paradox) is a contradiction reached in 1752 by French mathematician Jean le Rond d`Alembert. D`Alembert proved that – for incompressible and inviscid potential flow – the drag force is zero on a body moving with constant velocity relative to the fluid. Zero drag is in direct cont...
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http://en.wikipedia.org/wiki/D`Alembert`s_paradox

(from the article `Alembert, Jean Le Rond d`) ...momentum on impact of moving bodies, he produced the surprising result that the resistance of the particles was zero. D`Alembert was himself ...
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http://www.britannica.com/eb/a-z/d/4
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