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प्रश्न
A piece of wood if left under water comes to the surface. Explain the reason.
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उत्तर
A piece of wood if left under water comes to the surface of water because the upthrust on body due to its submerged part is equal to its own weight.
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संबंधित प्रश्न
A body floats in a liquid when its weight becomes equal to the weight of the liquid displaced by its submerged part.
Define buoyant force. Name two factors on which buoyant force depends.
What is the cause of buoyant force ?
A boy get into a floating boat.
What happens to the buoyant force on the boat ?
Define the term thrust. State its S.I. unit.
How is the unit bar related to the S.I. unit pascal?
Complete the following sentence :
Pressure at a depth h in a liquid of density p is ......................
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.
Select the correct option:
The phenomenon due to which a solid experiences upward force when immersed in water is called:
