Superimpose a uniform ?ow V ¼ 10i m=s, a doublet m ¼ 40 m3/s, and a vortex. Locate any stagnation points and ?nd the minimum pressure on the cylinder if the pressure of the standard atmospheric air is zero at a large distance from the cylinder. The strength of the vortex is (a) G ¼ 40p m2=s, (b) G ¼ 80p m2/s, and (c) G ¼ 120p m2/s.