Viscosity and Coefficient of Viscosity

The relative viscosity of blood remains constant between

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 ${10}^{-2} \mathrm{Pa} \mathrm{s}$)

Why do the machine parts get jammed in winter?

"Cars and aeroplanes are streamlined". Why ?

Water flows faster than honey. Why ?

"In scooters more viscous mobile oil is used in summer than in winter". Why ?

What is the effect of temperature on the viscosity of a liquid ?

Derive Poiseuille's formula using dimensions.

State Poiseuille's formula.

Define coefficient of viscosity.

What is viscosity?

The rate of flow of a liquid through a capillary tube of radius $r$ is $Q$ under a pressure difference of $P$. Calculate the rate of flow when the diameter is reduced to half and the pressure difference is made $4P$?Enable GingerCannot connect to Ginger Check your internet connection
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In giving a patient blood transfusion the bottle is set up so that the level of blood is $1.3 m$ above the needle which has an internal diameter of $3.6\times {10}^{-4} m$ and is $0.03 m$ in length. If $4.5 cc$ of blood passes through the needle in one minute calculate the viscosity of blood if density is $1020 kg{m}^{-3}$.

Emery powder particles are stirred up in a beaker of water $0.1 m$ deep. Assuming the pasticles to be spherical and of all sizes, calculate the radius of the largest particle remaining in suspension after $24 hours$. Given that density of emery is $4000 kg{m}^{-3}$ and coefficient of water is $0.001 decapoise$.Enable GingerCannot connect to Ginger Check your internet connection
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Two equal drops of water are falling through air with a steady volocity of $10 \raisebox{1ex}{$cm$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$. If the drops recombine to form a single drop what would be their terminal velocity?

A gas bubble of diameter $0.02 m$ rises steadily at the rate of $2.5\times {10}^{-2} m{s}^{-1}$ through a solution of density $2.5\times {10}^3 kg{m}^{-3}$. Calculate the coefficient of viscosity of the solution. Neglect the density of the gas.

A steel ball of radius $2\times {10}^{-3} m$ is released in an oil of viscosity $0.232 Ns{m}^{-2}$ and density $840 kg{m}^{-3}$. Calculate the terminal velocity of ball. Take density of steel as $7800 kg{m}^{-3}$.

A glass ball of radius ${10}^{-3} m$ and density $2000 kg{m}^{-3}$ fall in a jar filled with oil of density $800 kg{m}^{-3}$. The terminal velocity is found to be $1 cm{s}^{-1}$. Calculate the coefficient of viscosity of oil.

Compute the terminal velocity of a rain drop of radius $0.3 mm$. Take coefficient of viscosity of air$=1.83\times {10}^{-5} poise$  and density of air $=1.3 kg{m}^{-3}$. Density of water $={10}^3 kg{m}^{-3}$, $g=9.8 m^{-2}$.

An air bubble of diameter $2 cm$ is allowed to rise through a long cylindrical column of viscous liquid and travels at the rate of $0.21 cm{s}^{-1}$. If the density of the liquid is $1.47 gc{m}^{-3}$, find the coefficient of viscosity. Density of air is neglected.