(See Fluids in the News article titled “Incorrect raindrop shape,” Section 3.2.) The speed, V, at which a raindrop falls is a function of its diameter, D, as shown in Fig. P3.22. For what size raindrop will the stagnation pressure be equal to half the internal pressure caused by surface tension? Use the fact that due to surface tension effects the pressure inside a drop is greater than the surrounding pressure, where σ is the surface tension.
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