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Osmotic Pressure and Osmotic Potential

An iron ball ...

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An iron ball of radius 0.3 cm falls through a column of oil of density 0.94g/cm3 . If it attains a terminal velocity of 0.54 m/s . What is the viscosity of oil ?density of the iron is 7.8 g/cm3

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Q. An iron ball of radius

0.3 c m

falls through a column of oil of density

0.94 g c m^{- 3}

. If it attains a terminal velocity of

0.54 m s^{- 1}

, what is the viscosity of oil? Density of iron is

7.8 g c m^{- 3}

.
A viscous force of

1.018 \times 10^{- 7} N

acting on a raindrop makes it fall through air with a terminal velocity of

1 m s^{- 1}

. If the viscosity of air is

0.018 \times 10^{- 3} P I

, what is the radius of the raindrop ?

Q. A small metal ball of diameter

4 m m

10.5 g / c m^{3}

in dropped in glycerine of density

1.5 g / c m^{3}

. The ball attains a terminal velocity of

8 c m / sec

. The coefficient of viscosity of glycerine is

Q. If a ball of steel (density

ρ_{s} = 7.8 {g/cm}^{3}

) attains a terminal velocity of

10 cm/s

when falling in a tank of water (coefficient of viscosity,

η_{w} = 8.5 \times 10^{- 4} Pa-s

). Then, its terminal velocity in glycerine (

ρ_{g} = 1.2 {g/cm}^{3}, η_{g} = 13.2 Pa-s

) would be nearly:

Q. In a falling-ball viscometer, the ball attains terminal velocities of 0.01 m/s for oil A and 0.002 m/s for oil B. Assuming the oils have the same density and oil A has kinematic viscosity of

5 \times 10^{- 3} m^{2} / s

, the kinematic viscosity of oil B in

m^{2} / s

Q. An oil drop falls through air with a terminal velocity of

5 \times 10^{- 4} m/s

. The radius of the drop will be:

Neglect density of air compared to that of oil. (Viscosity of air

= \frac{18 \times 10^{- 5}}{5} {N.s/m}^{2}, g = 10 {m/s}^{2}

, density of oil

= 900 {kg/m}^{3}

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