A rain drop of radius 0.5 mm has a terminal velocity in air 2m/sec. The viscosity of air is `18xx10^-5 poise`. Find the viscous force on the raindrop.

An oiddroplet of 10^-4 cm radius and 0.95 g//cm^3 density is falling into air. The .density of air is 0.001293 g//cm^3 and the coefficient of viscosity is 181xx10^-6 CGS unit. Find the terminal velocity of the- droplet.

A rain drop of radius 2mm falls from a height of 250 m above the ground. What is the work done by the gravitational force on the drop ?

Air is incident vertically on the wall of a room of area 50 m^(2) , at a velocity of 100 km cdot h^(-1) . After hitting the wall surface, air moves parallel to the wall. If the density of air is 1.184 xx 10^(-3)" g"cdot cm^(-3) . Find the force exerted on the wall by air.

A solid sphere falls with a terminal velocity of 10 m/sec in air. If it is allowed to fall in vacuum

A plate of area 100 cm^2 is floating on oil of depth 2 mm. The coefficient of viscosity of oil is 15.5 poise. What horizontal force is required to move the plate horizontally with a velocity of 3 cm. s^-1 ?

Eight spherical rain drops of equal size falling vertically air with a terminal velocity of 0.01m/sec. What should be the terminal velocity if these drops were to combine to form one large spherical drops?