Calculate the viscous force acting on a rain drop of diameter 1mm, falling with a uniform velocity `2 m//s` through air. The coefficient of viscosity of air is `1.8 xx 10^-5 Ns//m^2`.

What will be the approximate terminal velocity of a rain drop of diamteter 1.8xx 10^(-3)m, when density of rain water ~~10^(3)kgm^(-3) and the co-efficient of viscosity of air ~~1.8xx10^(-5)Nsm^(-2) ? (Neglect buoyancy of air. )

Calculate the force required to move a flat metal plate of area 25cm^2 with a uniform velocity of 20 m//s over the surface of a liquid 1 mm thick if the coefficient of viscosity (n) is 2 Ns//m^2

A rain drop of radius 0.5 mm has a terminal velocity in air 2 m/s. If the coefficient of viscosity of air is 1.8xx10^(-4) poise, the viscous drag on the rain drop will be

The terminal velocity of a water drop of radius 0.01 mm falling through air is 1.12 cm/s. If the density of air is neglected, the coefficient of viscosity of air is [density of water =10^(3) kg//m^(3), g=9.8m//s^(2)]

A spherical drop of oil falls at a constant speed of 4 cm//s in steady air. Calculate the radius of the drop. The density of the oil is 0.9 g//cm^3 , density of air is 1.0 g//cm^3 and the coefficient of viscosity of air is 1.8 xx 10^-4poise , ( g = 980 cm//s^2 )

Consider a small sphere falling through a medium. The viscous force acting on the sphere depends upon the radius (r) of the sphere, velocity (V) of the sphere and the co-efficient of viscosity (eta) of the medium. Use dimensional analysis and show that the viscous force is directly proportional to etarv . (Given : Dimensions of eta =[M^1L^-1T^-1]) .

A spherical oil drop falls at a steady rate of 2 cm/s in still air. Find diameter of the drop . Take g =980 cm/s^2 . The coefficient of viscosity of air is 1.8 xx 10^(-4) Poise, Density of oil = 0.8 gm/ cm^3 , Density of air = 1 gm/ cm^3

A steel ball with radius 0.3mm is falling with velocity of 2 m//s at a time t, through a tube filled with glycerin, having coefficient of viscosity 0.833 Ns//m^2 . Determine viscous force acting on the steel ball at that time.