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प्रश्न
What is the cause of upthrust? At which point can it be considered to act?
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उत्तर
A liquid contained in a vessel exerts pressure at all points and in all directions. The pressure at a point in a liquid is the same in all directions - upwards, downwards and sideways. It increases with the depth inside the liquid.
When a body is immersed in a liquid, the thrusts acting on the side walls of the body are neutralized as they are equal in magnitude and opposite in direction. However, the magnitudes of pressure on the upper and lower faces are not equal. The difference in pressure on the upper and lower faces cause a net upward force (= pressure x area) or upthrust on the body.
It acts at the centre of buoyancy.
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संबंधित प्रश्न
In which direction does the buoyant force on an object due to a liquid act ?
What is the other name of buoyant force ?
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 ........
The density of water is 1.0 g Cm-3. The density of iron is 7.8 × 10″3 g Cm-3. The density of mercury is 13.6 g Cm-3.
Ans the following:
Will a piece of iron float or sink in water?
How does the liquid pressure on a diver change if :
The diver moves horizontally?
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.
Select the correct option.
Thrust acting perpendicularly on the unit surface area is called
What is meant by up thrust?
Salt water provides less buoyant force than freshwater.
