Home
Class 11
PHYSICS
A drop of water of radius 0.0015 mm is f...

A drop of water of radius 0.0015 mm is falling in air. If the coefficient of viscosity of air is `1.8xx10^(-8)kgm^(-1)s^(-1)` what will be the terminal velocity of the drop. Density of air can be neglected.

Text Solution

Verified by Experts

`V_(T)=(2)/(9)(r^(2)(rho-sigma)g)/(eta)=(2xx[(15xx10^(-4))/(1000)]^(2)xx10^(3)xx9.8)/(9xx1.8xx10^(-5))=2.72xx10^(-4)m//s`
Promotional Banner

Topper's Solved these Questions

  • ELASTICITY, SURFACE TENSION AND FLUID MECHANICS

    ALLEN |Exercise Exercise 1 (Elasticity)|16 Videos

  • ELASTICITY, SURFACE TENSION AND FLUID MECHANICS

    ALLEN |Exercise Exercise 1 (Surface Tension)|21 Videos

  • CENTRE OF MASS

    ALLEN |Exercise EXERCISE-V B|19 Videos

  • ERROR AND MEASUREMENT

    ALLEN |Exercise Part-2(Exercise-2)(B)|22 Videos

Similar Questions

Explore conceptually related problems

A rain drop of radius 0.3 mm has a terminal velocity in air 1m/s. the viscosity of air is 18xx10^(-5) poise. The viscous force on it is-

if a ball of steel (density rho=7.8 g//cm^(3) ) attains a terminal velocity of 10 cm//s when falling in a tank of water (coefficient of viscosity, eta_(water) =8.5xx10^(-4) Ps s), then its terminal velocity in glycerine (rho =1.2 g//cm^(2), eta =13.2 Pa s) would be nearly

Two drops of the same radius are falling through air with a steady velcoity of 5 cm s^(-1). If the two drops coalesce, the terminal velocity would be

Two rain drops of equal volume , falling with terminal velocity 10cms^(-1) , merge while falling and forms a larger drop . Find the terminal velocity of the larger drop .

If the density of air at NTP is 1.293kg//m^(3) and gamma=1.41 , then the velocity of sound in air at NTP is :

Glycerine flows steadily through a horizontal tube of length 1.5m and radius 1.0 cm . If the amount of glycerine collected per second at one is 4.0xx10^(-3)kgs^(-1) , what is the pressure difference between the two ends of the tube ? (Density of glycerine =1.3xx10^(10^(3)kgm^(-3) and viscosity of glycerine =0.83 Pa s). [ you may also like to check if the assumption of laminar flow in the tube is correct]

What is the excess pressure inside a bubble of soap solution of radius 5.00 mm , given that the surface of soap solution at the temperature (20^(@)C) is 2.50xx10^(-2)Nm^(-1) ? If an air bubble of the same dimension were formed at depth of 40.0 cm inside a container containing the soap solution (of relative density 1.20) , what would be the pressure is 1.01xx10^(5)Pa) .

A bubble of air of diameter 0.2 cm rises up uniformly in water with a velocity of 200cm//s . If the density of water is 1gcm^(-3) , find coefficient of viscosity of water. Neglect density of air w.r.t that of water. (g=9.8m//s^(2))

The terminal velocity of a copper ball of radius 1.0 mm falling through a tank of oil at 20^(@)C is 8.5cms^(-1) .Compute the viscosity of the oil at 20^(@)C .Density of oil is 1.5xx10^(3)kgm^(-3) , density of copper is 8.9xx10^(3)kgm^(-3)