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प्रश्न
A body experiences the same buoyant force while floating in water or alcohol.
पर्याय
Ture
False
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उत्तर
True.
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संबंधित प्रश्न
How does the pressure exerted by thrust depend on the area of surface on which it acts? Explain with a suitable example.
State three factors on which the pressure at a point in a liquid depends.
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.
A piece of wood if left under water comes to the surface. Explain the reason.
Will a body weigh more in air or vacuum when weighed with a spring balance? Give a reason for your answer.
How is the upthrust related to the volume of the body submerged in a liquid?
A body of mass 3.5 kg displaces 1000 cm3 of water when fully immersed inside it. Calculate:
- the volume of body,
- the upthrust on body and
- the apparent weight of body in water.
Calculate the hydrostatic pressure exerted by water at the bottom of a beaker. Take the depth of water as 40 cm, the density of water 1000 kgm−3 and g = 9.8 ms−2.
The blood pressure reading of a patient is recorded 160/100. Express the lower pressure in SI units.
[Take density of mercury as 13.6 × 103 kgm−3 and the value of ‘g’ as 10 ms−2]
Complete the analogy.
Downward force: Weight:: Upward force offered by liquid: _____
