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What is the correct answer?

4

The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcys coefficient of friction for pipe, and l = Length of pipe)

A. d = (D⁵/8fl)1/2

B. d = (D⁵/8fl)1/3

C. d = (D⁵/8fl)1/4

D. d = (D⁵/8fl)1/5

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