(Solved): please explain in details. 1. The effect of drag on a model airplane is to b ...

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please explain in details. 1.

The effect of drag on a model airplane is to be tested in a wind tunnel with a wind speed of $90\mathrm{m}/\mathrm{s}$. If a similar test is performed on the same model underwater in a channel, what should be the speed of the water to achieve the same result when the temperature is $16^{?}\mathrm{C}$ ? At the specified temperature, take Air kinematic viscosity $=14.7\times 10^{?6}{\mathrm{m}}^2/\mathrm{s}$ and water kinematic viscosity $=1.1088\times 10^{?6}{\mathrm{m}}^2/\mathrm{s}$.