Water in a container and air in a tornado flow in horizontal circular streamlines of radius \(r\) and speed \(V\) as shown in Video V3.6 and Fig. P3.14. Determine the radial pressure gradient, \(\partial p / \partial r\), needed for the following situations:

(a) The fluid is water with \(r=3 \mathrm{in}\). and \(V=0.8 \mathrm{ft} / \mathrm{s}\).

(b) The fluid is air with \(r=300 \mathrm{ft}\) and \(V=200 \mathrm{mph}\).

Figure P3.14

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