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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
What is meant by the term ‘buoyancy’ ?
A cork piece floats on water surface while an iron nail sinks in it. Explain the reason.
State three factors on which the pressure at a point in a liquid depends.
Complete the following sentence :
Pressure at a depth h in a liquid of density p is ......................
- Calculate the height of a water column which will exert on its base the same pressure as the 70 cm column of mercury. Density of mercury is 13.6 g cm-3.
- Will the height of the water column in part (a) change if the cross-section of the water column is made wider?
A block of wood is floating on water with its dimensions 50 cm x 50 cm x 50 cm inside water. Calculate the buoyant force acting on the block. Take g = 9.8 N kg-1.
Select the correct option.
Unit of thrust in the SI system is
What is meant by up thrust?
Is pressure a vector quantity?
How is thrust different from pressure?
