Let the vortex/sink flow of Eq. (4.134) simulate a tornado as in Fig. P8.25. Suppose that the circulation about the tornado is Γ = 8500 m2/s and that the pressure at r = 40 m is 2200 Pa less than the far-field pressure. Assuming in viscid flow at sea-level density, estimate (a) the appropriate sink strength €“m, (b) the pressure at r = 15 m, and (c) the angle β at which the streamlines cross the circle at r = 40 m (see Fig. P8.25)

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40 m