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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Fluid Mechanics
The Prandtl mixing length is

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

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