State Stokes' law mathematically and derive the maximum

characteristic size of a settling particle in accordance with Stokes'

law.

Determine the size and mass of a spherical particle of ${}_p=3000\frac{kg}{m^3}$

that settles in water at $\{$:$25C).[$Take ${}_{H_{2}O}$ at $25C=1cP($centi$-$Poise$)$

and $Ar=25000$