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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
What is meant by the term ‘buoyancy’ ?
A body floats in a liquid when its weight becomes equal to the weight of the liquid displaced by its submerged part.
Define the term relative density of a substance.
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.
A vessel contains water up to a height of 1.5 m. Taking the density of water 103 kg m-3, acceleration due to gravity 9.8 m s-2 and area of base of vessel 100 cm2, calculate: (a) the pressure and (b) the thrust at the base of vessel.
Will a body weigh more in air or vacuum when weighed with a spring balance? Give a reason for your answer.
A metal solid cylinder tied to a thread is hanging from the hook of a spring balance. The cylinder is gradually immersed into the water contained in a jar. What changes do you expect in the readings of the spring balance? Explain your answer.
Figure shows the same block of wood floating in three different liquids A, B and C of densities ρ1, ρ2 and ρ3 respectively. Which of the liquid has the highest density? Give a reason for your answer.
Write the SI units of Buoyant force
What do you mean by buoyancy?
