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प्रश्न
What is upthrust ?
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उत्तर
Upthrust (buoyant force) is the upward force exerted by a liquid when an object is immersed in it.
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संबंधित प्रश्न
Relative density of a substance is expressed in g cm-3.
Define the term Density of a substance.
What do you understand by the term upthrust of a fluid? Describe an experiment to show its existence.
Why is a force needed to keep a block of wood inside water?
Describe an experiment to show that a body immersed in a liquid appears lighter than it really is.
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.
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.
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.
Define atmospheric pressure diving suits. Does a diving suit create buoyancy?
State whether true or false. If false, correct the statement.
The weight of fluid displaced determines the buoyant force on an object.
