1.

The quantity of water flowing in thin cylindrical sheet of thickness dr is ____________

A. \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)2πrdr\)
B. \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)4πrdr\)
C. \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)8πrdr\)
D. \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)12πrdr\)
Answer» B. \(dq=\frac{hγ_w}{4ηL}(R^2-r^2)4πrdr\)


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