Advertisements
Advertisements
प्रश्न
A tall vertical cylinder filled with water is kept on a horizontal table top. Two small holes A and B are made on the wall of the cylinder, A near the middle and B just Below the free surface of water. State and explain your observation.
Advertisements
उत्तर
The water jet through A will have a larger horizontal range because the water pressure is more at that point. While B is just below the surface so water will come out of it without any significant pressure.
संबंधित प्रश्न
Name the force which makes heavy objects appear light when immersed in a liquid.
A body experiences the same buoyant force while floating in water or alcohol.
Describe an experiment to determine the density of the material of a coin.
Explain the meaning of the statement
‘Relative density of aluminium is 2.7’.
A cork piece floats on water surface while an iron nail sinks in it. Explain the reason.
How is the unit bar related to the S.I. unit pascal?
The diagram below in Fig. 4.12 shows a device which makes the use of the principle of transmission of pressure.
- Name the parts labelled by the letters X and Y.
- Describe what happens to valves A and B and to the quantity of water in the two cylinders when the lever arm is moved down.
- Give reasons for what happens to valves A and B in part (ii).
- What happens when the release valve is opened?
- What happens to valve B in cylinder P when the lever arm is moved up?
- Give a reason for your answer in part (v).
- State one use of the above device.
Two cylindrical vessels fitted with pistons A and B of area of cross-section 8 cm2 and 320 cm2 respectively are joined at their bottom by a tube and they are completely filled with water. When a mass of 4 kg is placed on piston A, Find:
- the pressure on piston A,
- the pressure on piston B, and
- the thrust on piston B.
Will a body weigh more in air or vacuum when weighed with a spring balance? Give a reason for your answer.
