1. A uniform ?ow V ¼ 20i m=s is superimposed on a source of strength 20p m2/s and a sink of equal strength located at (22 m, 0) and (2 m, 0), respectively. The resulting body formed by the appropriate streamline is a Rankine oval. Determine the length and thickness of the oval. Find the velocity at (0, 0).

2. A source near a wall is created by the method of images: superimpose two equal strength sources of strength 4p m2=s at (2 m, 0) and (22 m, 0), respectively. Sketch the ?ow showing the wall and ?nd the velocity distribution along the wall.