Hydraulics & Fluid Mechanics
In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is

40 M/SEC
50 M/SEC
22.5 M/SEC
33 M/SEC

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Hydraulics & Fluid Mechanics
The horizontal component of force on a curved surface is equal to the

product of pressure intensity at its centroid and area
weight of liquid vertically above the curved surface
force on the horizontal projection of the curved surface
force on a vertical projection of the curved surface

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