Fluid Mechanics
In an incompressible flow of fluid, the fluid

Is frictionless
Compressibility is greater than zero
Density does not change with pressure & temperature
Temperature remains constant

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Fluid Mechanics
The Prandtl mixing length is

Zero at the pipe wall and is a universal constant
Independent of radial distance from the pipe axis
Independent of the shear stress
Useful for computing laminar flow problems

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Fluid Mechanics
The continuity equation

None of these
Relates work and energy
Relates mass flow rate along a stream tube
Stipulates that Newton's second law of motion must be satisfied at every point in the fluid

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