The average velocity of water in a 4 cm by 20 cm rectangular channel is 10 m/s. If the channel undergoes a transition to a 4-cm-diameter pipe, the average velocity in the pipe is nearest:
A) 72 m/s
B) 64 m/s
C) 56 m/s
D) 48 m/s
B) 64 m/s
Use the continuity equation which represents the conservation of mass:
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