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प्रश्न
Why is a force needed to keep a block of wood inside water?
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उत्तर
A force is required to hold a block of wood in water because the upthrust caused by water on the block when fully submerged surpasses its weight.
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संबंधित प्रश्न
What do you mean by buoyancy?
Define buoyant force. Name two factors on which buoyant force depends.
How is the unit bar related to the S.I. unit pascal?
State whether pressure is a scalar or vector?
The pressure P1 at the top of a dam and P2 at a depth h form the top inside water (density p) are related as :
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.
What do you understand by the term upthrust of a fluid? Describe an experiment to show its existence.
Complete the following sentence.
Mass = .................... × density
Select the correct option.
Unit of thrust in the SI system is
What is meant by up thrust?
