Advertisements
Advertisements
Question
How much work is required to form a bubble of 2 cm radius from the soap solution having surface tension 0.07 N/m?
Advertisements
Solution
Given:
r = 2 cm = 2 × 10-2 m,
T = 0.07 N/m
To find:
Work required to form a bubble
Solution:
Initial surface area of soap bubble = 0
Final surface area of soap bubble = 2 × 4πr2
∴ Increase in surface area = 2 × 4πr2
The work done = surface tension × increase in surface area
= T × 2 × 4πr2
= 0.07 × 2 × 4 × 3.142 × (2 × 10-2)2
= 7.038 × 10-4 J
APPEARS IN
RELATED QUESTIONS
Multiple Choice Question.
Two capillary tubes of radii 0.3 cm and 0.6 cm are dipped in the same liquid. The ratio of heights through which the liquid will rise in the tubes is
Why is a low-density liquid used as a manometric liquid in a physics laboratory?
What is an incompressible fluid?
Obtain an expression for conservation of mass starting from the equation of continuity.
The speed of water is 2m/s through a pipe of internal diameter 10 cm. What should be the internal diameter of the nozzle of the pipe if the speed of the water at nozzle is 4 m/s?
With what velocity does water flow out of an orifice in a tank with gauge pressure 4 × 105 N/m2 before the flow starts? Density of water = 1000 kg/m3.
Why two or more mercury drops form a single drop when brought in contact with each other?
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.
Unit of the coefficient of viscosity is ______
Two capillary tubes of radii 0.6 cm and 0.3 cm are dipped in the same liquid. The ratio of heights through which the liquid will rise in the tubes is ______.
What is the surface film?
What are cohesive forces?
State properties of an ideal fluid.
