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In the frame of the ball, viscous coupling with the surface of the ball
impedes the air on the right more than it does on the left (and may even
increase the flow on the left if the ball is spinning fast enough.)
Therefore the "slow air" is on the right and the ball is pushed to the
left. Of course it is worth pointing out that viscosity is incompatible
with a Bernoulli based explanation. Hmm...
John
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