The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the_____________________?
Correct answer: D. All A., B. and C.
- A. Inverse of fluid viscosity
- B. Square of particle size
- C. Difference in the densities of the particle & fluid
- D. All A., B. and C.
Explanation
In the Stokes-law range, terminal velocity is proportional to (ρp − ρf)d²/μ, so it increases with the density difference and the square of particle size, and decreases with fluid viscosity. Therefore all three listed relationships apply.
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