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GATE Mechanical 2023 | Question-9

\begin{tabular}{|l|l|}
\hline Q.19 & $\begin{array}{l}\text { Air }\left(\text { density }=1.2 \mathrm{~kg} / \mathrm{m}^{3}, \text { kinematic viscosity }=1.5 \times 10^{-5} \mathrm{~m}^{2} / \mathrm{s}\right) \text { flows over a flat } \\
\text { plate with a free-stream velocity of } 2 \mathrm{~m} / \mathrm{s} . \text { The wall shear stress at a location } \\
15 \mathrm{~mm} \text { from the leading edge is } \tau_{w} . \text { What is the wall shear stress at a location } \\
30 \mathrm{~mm} \text { from the leading edge? }\end{array}$ \\
\hline

  1. & $\tau_{w} / 2$ \\
    \hline
  2. & $\sqrt{2} \tau_{w}$ \\
    \hline
  3. & $2 \tau_{w}$ \\
    \hline
  4. & $\tau_{w} / \sqrt{2}$ \\
    \hline
    \end{tabular}
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