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प्रश्न
Why is a force needed to keep a block of wood inside water?
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उत्तर
A force is required to hold a block of wood in water because the upthrust caused by water on the block when fully submerged surpasses its weight.
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संबंधित प्रश्न
What is the scientific name of the 'upward force' acting on an object immersed in a liquid?
A body sinks in a liquid A but floats in a liquid B. The density of liquid A is ....... than the density of liquid B.
The weight of a body floating in a liquid is ........
State the laws of liquid pressure.
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.
The pressure inside a liquid of density p at a depth h is :
The pressure P1 at a certain depth in river water and P2 at the same depth in sea water are related as :
Define upthrust and state its S.I. unit.
Two spheres A and B, each of volume 100 cm3 is placed on water (density = 1.0 g cm−3). The sphere A is made of wood of density 0.3 g cm−3 and sphere B is made of iron of density 8.9 g cm−3.
- Find:
- The weight of each sphere, and
- The upthrust on each sphere.
- Which sphere will float? Give reason.
Complete the analogy.
Downward force: Weight:: Upward force offered by liquid: _____
