問題詳情

49. Water is flowing at 4.0 m/s in a circular pipe. If the diameter of the pipe decreases to 1/2 its former value, what is the velocityof the water downstream?
(A) 16 m/s
(B) 4.0 m/s
(C) 1.0 m/s
(D) 8.0 m/s
(E) 2.0 m/s

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