Evaluate terminal velocity of a glass sphere of 7.5mm diameter and 2250kg/m3 density falling freely through (a) air; (density =1.177kg/m3, kinematic viscosity v=1.569105m2/s ) (b) water; (density =996.1kg/m3, kinematic viscosity v=0.879106m2/s ) (c) glycerin. (density =1260kg/m3, kinematic viscosity =7.08104m2/s )