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Deep
  • Member for 8 years, 5 months
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Friction loss in a vertical pipe flow
You have assumed fully developed flow, so $v$ depends only on radial distance and not on axial distance.
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Power Washer velocity reduction 200 mm away from tip
What do you mean by "water velocity drop"?
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Friction loss in a vertical pipe flow
added 302 characters in body
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Danger Zone for Aircraft
In the question, and going by the answer as well, danger zone seems to be defined as that region where there is mere possibility of getting hit. If you were pilot of that jet, wouldn't you define it the same way?
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Mass density of a cylinder increasing with the square of the radius
Equate the integral to mass: $m=\int[~~]$, and not to $\rho$
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