In a Falling-Ball Viscometer, a ball that has a 1.5 mm diameter and is made of unknown material is allowed to fall freely in Linseed oil. If the ball falls 150 mm in 7.2 seconds, calculate the density of the ball. The kinematic viscosity of linseed oil is found to be 4.28
\times 10^(-4)(m^(2))/(s).
