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प्रश्न
What is the centre of buoyancy? State its position for a floating body with respect to the centre of gravity of the body.
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उत्तर
Centre of buoyancy: It is the point through which the resultant of the buoyancy forces on a submerged body act; it coincides with the centre of gravity of the displaced liquid, if the body is completely immersed.
For a floating body with its part submerged in the liquid, the centre of buoyancy is at the centre of gravity of the submerged part of the body and it lies vertically below the centre of gravity of the entire body.
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संबंधित प्रश्न
What is the other name of buoyant force ?
Fill in the blank with suitable word :
It is the................. force which makes objects appear lighter in water.
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.
Deduce an expression for the pressure at depth inside a liquid.
The pressure P1 at a certain depth in river water and P2 at the same depth in sea water are related as :
A block of iron of mass 7.5 kg and of dimensions 12 cm × 8 cm × 10 cm is kept on a table top on its base of side 12 cm × 8 cm.
Calculate:
- Thrust and
- Pressure exerted on the table top
Take 1 kgf = 10 N.
Two cylindrical vessels fitted with pistons A and B of area of cross-section 8 cm2 and 320 cm2 respectively are joined at their bottom by a tube and they are completely filled with water. When a mass of 4 kg is placed on piston A, Find:
- the pressure on piston A,
- the pressure on piston B, and
- the thrust on piston B.
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.
Thrust acting perpendicularly on the unit surface area is called
The point at which the force of buoyancy is supposed to act is known as ______.
