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प्रश्न
Why does a block of wood held under water rise to the surface when released ?
उत्तर
A wooden block held under water floats on the surface on release because it is less dense than water. A substance floats if it is less dense than the fluid in which it is immersed after the external force is withdrawn from it.
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संबंधित प्रश्न
Relative density of a substance is expressed in g cm-3.
The S.I. unit of density is ..........
Which of the following will sink or float on water? (Density of water = 1 g Cm-3)
(a) body A having density of 500 kg m-3
The density of water is 1.0 g Cm-3. The density of iron is 7.8 × 10″3 g Cm-3. The density of mercury is 13.6 g Cm-3.
Ans the following:
Will a piece of iron float or sink in water?
Explain the following statement:
Sleepers are laid below the rails.
Explain why a gas bubble released at the bottom of a lake grows in size as it rises to the surface of the lake.
Complete the following sentence :
Pressure of a liquid at a given depth is .................. To the density of the liquid.
The S.I. unit of upthrust is :
The magnitude of buoyant force acting on an object immersed in a liquid depends on ______ of the liquid.
The point at which the force of buoyancy is supposed to act is known as ______.
