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प्रश्न
Explain the following statement:
Sleepers are laid below the rails.
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उत्तर
Wide wooden sleepers are placed below the railway tracks so that the pressure exerted by the rails on the ground becomes less.
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संबंधित प्रश्न
What do you mean by buoyancy?
What is upthrust ?
Why does it happen?
A ship dips to a larger depth in fresh water as compared to marine water.
(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).
A small block of wood is completely immersed in (i) water, (ii) glycerine and then released. In each case, What do you observe? Explain the difference in your observation in the two cases.
Complete the following sentence :
A piece of wood is held under water. The upthrust on it will be ___________ the weight of the wood piece.
Prove that the loss in weight of a body when immersed wholly or partially in a liquid is equal to the buoyant force (or upthrust) and this loss is because of the difference in pressure exerted by liquid on the upper and lower surfaces of the submerged part of body.
Select the correct option:
When a body is wholly or partially immersed in a liquid, it experiences a buoyant force which is equal to:
What do you mean by buoyancy?
Icebergs and ships stay afloat due to ______.
