Determine the radius of the ball by assuming the Stake's Law and using that the viscosity (n) = 0.891 x10-3 kg m-1 s-1 @ 298 K. A spherical quartz ball of density 2.66 x 103 kgm-3 sediments at a speed of 2.59 m s-1 under the influence of gravity (g=9.807 m s-2) in distilled water at the 25oC where the density= 0.998 x 103 kgm-3.