[2]- A sphere of 2.2mm diameter is dropped in water (=1000kg/m3,=1103kg m/s ). The sphere falls a distance of 10.5cm in 21 seconds. Assuming steady state conditions (Use equations for Settling of Particles): a) Calculate the density of the sphere. b) If the above sphere is dropped in a fluid of a specific gravity of 0.81 and its terminal velocity was measured as 2.05cm/s, calculate the viscosity of the fluid