Fluid Mechanics
The Prandtl mixing length is

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

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Fluid Mechanics
Vane anemometer

Rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed
None of these
Is a variable head meter
Is an area meter

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