Advertisements
Advertisements
Question
An air bubble of radius 0.2 mm is situated just below the water surface. Calculate the gauge pressure. Surface tension of water = 7.2 × 10−2 N/m.
Solution
Given:
R = 2 × 10−4 m,
T = 7.2 × 10−2 N/m,
p = 103 kg/m3
To find:
Calculate the gauge pressure.
Solution:
The gauge pressure inside the bubble = `"2T"/"R"`
= `(2(7.2xx10^-2))/(2xx10^-4)`
= 7.2 × 102
= 720N/m2 (or 720Pa)
APPEARS IN
RELATED QUESTIONS
Explain why Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km
A 50 kg girl wearing high heel shoes balances on a single heel. The heel is circular with a diameter 1.0 cm. What is the pressure exerted by the heel on the horizontal floor?
Toricelli’s barometer used mercury. Pascal duplicated it using French wine of density 984 kg m–3. Determine the height of the wine column for normal atmospheric pressure.
For a given thrust, pressure is more on a surface of large j area.
The pressure on a surface increases with an increase in the thrust on the surface.
Pressure is reduced if .................... increases.
How is the thrust related to pressure?
Name two factors on which the pressure on a surface depends.
When does a man exert more pressure on the floor: while standing or while walking?
A normal force of 200 N acts on an area of 0.02 m2. Find the pressure in pascal.
How much thrust will be required to exert a pressure of 20,000 Pa on an area of 1 cm2.
If someone presses a pointed needle against your skin, you are hurt. But if someone presses a rod against your skin with the same force, you easily tolerate. Explain.
A beaker containing a liquid is kept inside a big closed jar. If the air inside the jar is continuously pumped out, the pressure in the liquid near the bottom of the liquid will
Multiple Choice Question.
A hydraulic lift is designed to lift heavy objects of maximum mass 2000 kg. The area of cross-section of piston carrying the load is 2.25 × 10-2 m2. What is the maximum pressure the smaller piston would have to bear?
Consider the statement given below and choose the correct option.
Assertion: Broad straps are used in bags.
Reason: Broad straps last for long.
A drinking straw works on the existence of ______.
A water tank has four taps fixed at points A,B,C and D as shown in figure. The water will flow out at the same pressure from taps at
It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.
The total force exerted by a body normal to the surface is called ______.
Explain why the cutting instruments are sharpened.
Cooking in a place located at a higher altitude is difficult. Why?
Why do scuba divers wear a special suit while they go into deep sea levels?
Give reasons why:
cutting edges of knives and axes are sharpened.
All flowing substances, both liquids, and gases are called ______.
Assertion (A): A sleeping mattress is so designed that when you lie on it, a large area of your body comes in its contact.
Reason (R): This reduces the pressure on the body and sleeping becomes comfortable.
Define thrust.
Iceberg floats in water with part of it submerged. What is the fraction of the volume of iceberg submerged if the density of ice is ρi = 0.917 g cm–3?
