Determine the radius of a drop of water falling through air, if it covers 4.1 cm in 4 seconds with a uniform velocity.[density of air 0.001293 `g cm^-3`, viscosity of air = `1.8xx10^-4` poise]

Two equal drops of water are falling through air with a steady velocity of 0.1m/s. if the drops coalese, what will be its velocity?

Two equal drops of water are falling through air with a steady velocity of 10 cm/s. If the two drops recombine to a single drop, what will be the terminal velocity

Find the ternimal velocity of a steel ball 2 mm in diameter falling through glycerine.(Sp gr. Of steel = 8 and of glycerine =1.3, viscosity of glycerine = 8.3 poise)

The terminal velocity of a copper ball of radius 2.0 mm falling through a tank of oil at 20^@C is 6.5 cm/s. Compute the viscosity of the oil at 20^@C . Given, rho_(oil) = 1.5 xx 10^3 kg//m^3, rho_(copper) = 8.9 xx 10^3 kg//m^3 .

Two drops of water of same size are falling through air with terminal veloity 10m/s. if the two drops coalese to form a single drop, what will be the new ternimal velocity?

A brass boiler has a base area of 0.15 m2 and thickness 1.0 cm. It boils water at the rate of 6.0 kg/min when placed on a gas stove. Estimate the temperature of the part of the flame in contact with the boiler. Thermal conductivity of brass = 109 J s ^-1m^- 1K^-1 , Heat of vaporisation of water = 2256 xx 10^3 J kg^-1 .

In Millikan’s oil drop experiment, what is the terminal speed of an uncharged drop of radius 2.0 xx 10^-5m and density 1.2 xx 10^3 kg m^-3 ? Take the viscosity of air at the temperature of the experiment to be 1.8 xx 10^-5 Pa s. How much is the viscous force on the drop at that speed? Neglect buoyancy of the drop due to air.

A beam of light of wavelength 6000 xx 10^-8 cm passes from air to glass (n = 1.5). Find the velocity.

Calculate the depth of water at which an air bubble of radius 4xx10^-4 m may remain in equilibrium( surface tension = 70xx10^-3 N/m).