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A steady stream of water falls straight down from a pipe. Assume the flow is incompressible. At a distance d1 beneath the pipe the speed of the falling water is 1.0 m/s. At a distance d2 beneath and pipe the speed of the falling water is 2.0 m/s. What is the ratio of the cross section of the flow at height d1 to the cross section at height d2 ?(A) 4:1 (B) 2:1 (C) 1:2 (D) 1:4
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