Two cylindrical pipes both carry an ideal fluid (zero viscosity) in laminar flow. Pipe A has radius RA = 8 cm and flow velocity vA = 2 cm/s. Pipe B has radius RB = 4 cm and flow velocity vB = 4 cm/s. Compared to the rate of flow in pipe A, that in pipe B is

A. twice as large.
B. the same.
C. half as large.
D. It depends on the length of the pipe


Answer: C

Physics & Space Science

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