A) 30 cm
B) 75 cm
C) 150 cm
D) 300 cm
Correct Answer: B
Solution :
\[v=15\times {{10}^{-6}}{{\text{m}}^{\text{2}}}\text{/s,}\] \[{{U}^{\infty }}=10\,\text{m/s}\] \[{{\operatorname{Re}}_{c}}=5\times {{10}^{5}}\] \[{{\operatorname{Re}}_{c}}=\frac{{{U}_{\infty }}x}{v}\] \[x=\frac{5\times {{10}^{5}}\times 15\times {{10}^{-6}}}{10}=0.75\,m\,\,or\,\,75\,cm\]
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