Find the viscous drag between the two liquid layers each of area 100 `cm^(2)`, and having relative velocity 8 cm `s^(-1)`. The viscosity of the liquid is 0.004 PI and the layers are separated by a distance 4 cm.

A rain drop of radius 0.4 mm falls through air with a terminal velocity of 50 cm s^(-1) . The viscosity of air is 0.019 Pa-s . Find the viscous force on the rain drop.

What is the viscous force on the drop of liquid of radius 0.2 mm moving with a constant velocity 4cm s^(-1) throught a medium of viscosity 1.8xx10^(-5) Nm^(-2) s .

Calculate the viscous force on a liquid drop of radius 0.3 mm moving with a velocity of 5 cms^(-1) through a medium of viscosity 2 xx 10^(-5) Nm^(-2)s.

Two parallel layers of water are moving with a relative velocity of 10 cm/s. What will be the velocity gradient if the perpendicular distance between the layers is 0.2 cm.

What is the force due to viscosity acting on a layer of water of area 4xx10^(-2)m^2 , if the relative velocity between the two layers of water, separated by 0.4 mm is 5 cm/s ? The coefficient of viscosity of water = 0.01 poise.[1 poise=0.1 Ns//m^2 ]

Two glass plates each of length 16 cm and breadth 8 cm move parallel to each other in water with a relative velocity of 6 cm s^(-1) . If the viscous force is 175 xx 10^(-5) N, what is their distance of separation ? (Given eta_("water") = 0.001 PI)

A test tube floats to a depth 4 cm in water and to a depth 8 cm in a liquid. The relative density of the liquid is _____.

There is a 1mm thick layer of glycerine between a flat plate of area 100cm^(2) and and a big plate. If te coefficient of viscosity of glycerine is 1.0kg//m-sec , then how much force is required to move the plate with a velocity of 7 cm/sec.

A Square metal plate of side 10 cm is moving parallel to another plate with a velocity of 10 cm//s and both plates are immersed in water. If the viscosity of water is 0.01 poise and the distance between the plates is 0.05 cm then calculate the viscous force.

An incompressible liquid flows through a uniform cross section tube with velocity 12 cm/s. the thickness of liquid layer is 0.8 cm then velocity of gradient of flow is