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A body weighs 4.0 kg-wt on the surface of the Earth. What will be its weight on the surface of a plant whose mass is `1/8` th of the mass of the Earth and radius half `(1/2)` of that of the Earth?
Concept: Surface Tension
Show that the surface tension of a liquid is numerically equal to the surface energy per unit
area.
Concept: Surface Tension
‘g’ is the acceleration due to gravity on the surface of the Earth and ‘R’ is the radius of the
Earth.
Show that acceleration due to gravity at height ‘h’ above the surface of the Earth is
`gh = g (R/(R+H))^2`
Concept: Variation in the Acceleration>Variation in Gravity with Altitude
A big drop of radius R is formed from 1000 droplets of water. The radius of a droplet will be _______
A) 10 R
B) R/10
C) R/100
D) R/1000
Concept: Surface Tension
State any two characteristics of the angle of contact
Concept: Surface Tension
Calculate the work done in increasing the radius of a soap bubble in air from 1 cm to 2 cm. The surface tension of soap solution is 30 dyne/cm. (Π = 3.142).
Concept: Surface Tension
What is the decrease in weight of a body of mass 500 kg when it is taken into a mine of depth 1000 km? (Radius of earth R = 6400 km, g = 9.8 m/s2)
Concept: Variation in the Acceleration>Variation in Gravity with Altitude
When a sparingly soluble substance like alcohol is dissolved in water, surface tension of water
Concept: Surface Tension
Define binding energy and obtain an expression for binding energy of a satellite revolving in a circular orbit round the earth.
Concept: Binding Energy and Escape Velocity of a Satellite
Obtain an expression for the rise of a liquid in a capillary tube.
Concept: Capillarity and Capillary Action
The energy stored in a soap bubble of diameter 6 cm and T = 0.04 N/m is nearly ______.
Concept: Surface Tension
Why is the surface tension of paints and lubricating oils kept low?
Concept: Surface Tension
How much amount of work is done in forming a soap bubble of radius r?
Concept: Surface Tension
Why is a low-density liquid used as a manometric liquid in a physics laboratory?
Concept: Fluid and Its Properties
With what terminal velocity will an air bubble 0.4 mm in diameter rise in a liquid of viscosity 0.1 Ns/m2 and specific gravity 0.9? Density of air is 1.29 kg/m3.
Concept: Critical Velocity and Reynolds Number
A rectangular wireframe of size 2 cm x 2 cm, is dipped in a soap solution and taken out. A soap film is formed, if the size of the film is changed to 3 cm x 3 cm, Calculate the work done in the process. The surface tension of the soap film is 3 x 10-2 N/m.
Concept: Fluid and Its Properties
Insect moves over the surface of water because of ______.
Concept: Surface Tension
The surface tension of a liquid at critical temperature is ______
Concept: Surface Tension
What is the surface film?
Concept: Fluid and Its Properties
What is the net weight of a body when it falls with terminal velocity through a viscous medium?
Concept: Critical Velocity and Reynolds Number
