A) \[{{10}^{6}}\]
B) \[{{10}^{3}}\]
C) \[{{10}^{4}}\]
D) \[{{10}^{2}}\]
Correct Answer: C
Solution :
Reynolds Number\[=\frac{\rho \text{v}d}{\eta }\] Volume flow rate \[=\text{v}\times \pi {{r}^{2}}\] \[\text{v}=\frac{100\times {{10}^{-3}}}{60}\times \frac{1}{\pi \times 25\times {{10}^{-4}}}\] \[\text{v}=\frac{2}{3\pi }m/s\] Reynolds Number\[=\frac{{{10}^{3}}\times 2\times 10\times {{10}^{-2}}}{{{10}^{-3}}\times 3\pi }\] \[\simeq 2\times {{10}^{4}}\] order\[{{10}^{4}}\]
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