A boundary is known as hydrodynamically smooth if:

1.	A boundary is known as hydrodynamically smooth if:
A.	\(\frac{K}{\delta}=0.3\)
B.	\(\frac{K}{\delta}>0.3\)
C.	\(\frac{K}{\delta}<0.25\)
D.	\(\frac{K}{\delta}=0.5\)
Answer» D. \(\frac{K}{\delta}=0.5\)

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