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To demonstrate Bernoulli s principle an instructor arranges two circular horizontal plates of radii b...

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To demonstrate Bernoulli s principle an instructor arranges two circular horizontal plates of radii b each with distance d d b between them see figure The upper plate has a hole of radius a in the middle On blowing air at a speed v through the hole so that the flow rate of air is ra v it is seen that the lower plate does not fall If the density of air is p the upward force on the lower plate is well approximated by the formula assume that the region with r a does not contribute to the upward force and the speed of air at the edges is negligible take a b A C v 4d apvid In a In a B v b 4d In a 27pa n D d

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