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प्रश्न
What do you mean by buoyancy?
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उत्तर
All liquid exerts a upward force on the body placed in it. This Phenomenon is called buoyancy.
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संबंधित प्रश्न
Name the force which makes heavy objects appear light when immersed in a liquid.
What causes buoyant force (or upthrust) on a boat ?
What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid ? When does the buoyant force become maximum ?
The S.I. unit of density is ..........
What is the unit of relative density?
Define the term thrust. State its S.I. unit.
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.
The pressure of water on the ground floor is 40,000 Pa and on the first floor is 10,000 Pa. Find the height of the first floor. (Take : density of water = 1000 kg m-3, g = 10 m s-2)
A body will experience minimum upthrust when it is completely immersed in :
In a fluid, buoyant force exists because the pressure at the ______ of an object is greater than the pressure at the top.
