Fluid Mechanics
Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is

5π/√2
5π/2
5√2π
10√2π

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Fluid Mechanics
A stream line is

A line connecting the mid points of flow cross-section
Always the path of particle
Fixed in space in steady flow
Drawn normal to the velocity vector at every point

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