A) \[\frac{{{\tau }_{1}}}{{{\tau }_{2}}}=3.0\]
B) \[\frac{{{\tau }_{1}}}{{{\tau }_{2}}}=\frac{1}{3}\]
C) \[\frac{{{\tau }_{1}}}{{{\tau }_{2}}}=\,\,{{\left( 3.0 \right)}^{1/2}}\]
D) \[\frac{{{\tau }_{1}}}{{{\tau }_{2}}}=\,\,\left( 3.0 \right)\]
Correct Answer: C
Solution :
Boundary shear stress \[\propto \frac{1}{\sqrt{{{\operatorname{Re}}_{x}}}}\propto \frac{1}{\sqrt{x}}\] \[\frac{{{\tau }_{1}}}{{{\tau }_{2}}}=\sqrt{\frac{{{x}_{2}}}{{{x}_{1}}}}=\sqrt{\frac{90}{30}}=\sqrt{3}\]You need to login to perform this action.
You will be redirected in
3 sec