A dispersion of oil in water is to be separated using a centrifuge. Assume that the oil is dispersed in the form of spherical globules 5.1 x 10-5 m diameter and that its density is 894 kg m-3 . If the centrifuge rotates at 1500 rev/min and the effective radius at which the separation occurs is 3.8 cm, calculate the velocity of the oil through the water. Take the density of water to be 1000 kg m-3 and its viscosity to be 0.7 x 10-3 N s m-2 . (The separation in this problem is the same as that in Example 3, in which the rate of settling under gravity was calculated.)