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प्रश्न
What is meant by the term ‘buoyancy’ ?
उत्तर
Buoyancy is an upward force exerted by a fluid that opposes the weight of an immersed object.
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संबंधित प्रश्न
A body while floating sinks deeper in a liquid of low density than in a liquid of high density.
Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?
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(i) The diameter of neck and bottom of a bottle are 2 cm and 10 cm, respectively. The bottle is completely filled with oil. If the cork in the neck is pressed in with a force of 1.2 kgf, what force is exerted on the bottom of the bottle?
(ii) Name the law/principle you have used to find the force in part (a).
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A body weighs 450 gf in air and 310 gf when completely immersed in water. Find
(i) The volume of the body,
(ii) The loss in weight of the body, and
(iii) The upthrust on the body.
State the assumption made in part (i).
A balloon filled with helium gas floats in a big closed jar which is connected to an evacuating pump. What will be your observation, if air from the jar is pumped out? Explain your answer.
In a fluid, buoyant force exists because the pressure at the ______ of an object is greater than the pressure at the top.
