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Building that indicator for a tube requires the fluid density, its viscosity, the tube radius and the fluid's:
ASound
BSmell
CSpeed
DColour
Answer & Solution
Correct answer: C. Speed
1. Four quantities go in.
2. One of them describes motion.
3. It is the speed.
_Source: OpenStax University Physics Volume 1, Chapter 14, Fluid Mechanics._
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