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A football, meant to be thrown at $100 \mathrm{~km} / \mathrm{h}$ in sea level air $\left(\rho=1.22 \mathrm{~kg} / \mathrm{m}^{3}, \mu=1.78 \times 10^{-5} \mathrm{~N}-\mathrm{s} / \mathrm{m}^{2}\right),$ is
to be tested using a one-quarter scale model in a water tunnel $\left(\rho=1000 \mathrm{~kg} / \mathrm{m}^{3}, \mu=10^{-3} \mathrm{~N}-\mathrm{s} / \mathrm{m}^{2}\right)$. For dynamic similarity, the ratio of the model force to the prototype force is ______________(round to nearest integer).



Question ID - 1 | SaraNextGen Top Answer

A football, meant to be thrown at $100 \mathrm{~km} / \mathrm{h}$ in sea level air $\left(\rho=1.22 \mathrm{~kg} / \mathrm{m}^{3}, \mu=1.78 \times 10^{-5} \mathrm{~N}-\mathrm{s} / \mathrm{m}^{2}\right),$ is
to be tested using a one-quarter scale model in a water tunnel $\left(\rho=1000 \mathrm{~kg} / \mathrm{m}^{3}, \mu=10^{-3} \mathrm{~N}-\mathrm{s} / \mathrm{m}^{2}\right)$. For dynamic similarity, the ratio of the model force to the prototype force is ______________(round to nearest integer).

1 Answer
127 votes
Answer Key / Explanation : (4 to 4) -

4 to 4

127 votes


127