Viscosity

An open cubical tank was initially fully filled with water. When the tank was accelerated on a horizontal plane along one of its side it was found that one third of volume of water spilled out. The acceleration was

The excess pressure inside an air bubble of radius r just below the surface of water is ​$P_1$ . The pressure inside a drop of the same radius just outside the surface is $P_2$ . If T is surface tension then

The velocity of upper layer of water in a river is $36 \mathrm{km} {\mathrm{h}}^{-1}$. Shearing stress between horizontal layers of water is ${10}^{-3} \mathrm{N} {\mathrm{m}}^{-2}$. Depth of the river is _____ $\mathrm{m}$. (Co-efficient of viscosity of water is ${10}^{-2} \mathrm{Pa} \mathrm{s}$)

What is the constant force $F$ required to pull the plate of area A parallel to wall with constant velocity $V_0$ in the given figure. ( $\eta =$ coefficient of viscosity.)

A force of $3.14 \mathrm{N}$ is required to drag a sphere of radius $4 \mathrm{cm}$ with a speed of $5 \mathrm{m}/\mathrm{s}$ in a medium in gravity free space. The coefficient of viscosity of the medium is

A force of $3.14 \mathrm{N}$ is required to drag a sphere of radius $4 \mathrm{cm}$ with a speed of $5 \mathrm{m} {\mathrm{s}}^{-1}$ in a medium in gravity free space. The coefficient of viscosity of the medium is

When a tangential force of $0.02 \mathrm{N}$ is applied on a large wooden plate of area $10{ \mathrm{m}}^2$ floating on the surface of river, plate moves with the speed $2 {\mathrm{ms}}^{-1}$ on the river surface. The river is $1 \mathrm{m}$ deep and the water in contact with the bed is stationary. Assuming constant speed gradient, coefficient of viscosity of water is

Consider a situation in which there is a Newtonian fluid between two long coaxial uniformly moving cylinders of radius $R$ and $2R$.

 On increasing pressure, the viscosity of gas molecules _____ due to the increase in glow of molecules.

On increasing pressure viscosity of liquid molecules _____.

On increasing pressure viscosity of liquid molecules increases.

How does viscosity affect pressure drop?
 

How does pressure affect viscosity?
 

A layer of oil $1.5 \mathrm{mm}$ thick is placed between two microscope slides. A force of $5.5\times {10}^{-4} \mathrm{N}$ is required to glide one slide over the other at a speed of $1 \mathrm{cm} {\mathrm{s}}^{-1}$. If the coefficient of viscosity of the oil is $0.138 \mathrm{N} \mathrm{s} {\mathrm{m}}^{-2}$, then their contact area is _____.

Calculate the area of metal plate that is placed on a layer of castor oil of thickness $0.25\times {10}^{-3} \mathrm{m}$, as $2.5 \mathrm{N}$ of force is applied on the plate to move with velocity $3\times {10}^{-2} \mathrm{m} {\mathrm{s}}^{-1}$. The coefficient of viscosity of castor oil is $0.083\times {10}^3 \mathrm{N} \mathrm{s} {\mathrm{m}}^{-2}$.

Using the S.I. unit find the dimensional formula for coefficient of viscosity.

The possible CGS units of coefficient of viscosity is 

Which of the following are the possible S.I. units of coefficient of viscosity?

Explain the free fall of a spherical body in a viscous liquid and derive the expression for the viscous force acting on it.

Explain the importance of reynold's number.