Advertisements
Advertisements
प्रश्न
It is easier to lift a heavy stone under water than in air. Explain.
Advertisements
उत्तर १
It is easier to lift a heavy stone under water than in air because in water, it experiences an upward buoyant force which balances the actual weight of the stone acting downwards. Thus, due to upthrust there is an apparent loss in the weight of the heavy stone, which makes it lighter in water, and hence easy to lift.
उत्तर २
It is easier to lift a heavy stone under water because in water an upthrust acts on the upward direction which reduces the apparent weight of the stone and makes it easy to lift.
संबंधित प्रश्न
The density of aluminium is 2.7 g cm-3 and that of brass 8.4 g cm’3. The correct statement is
A piece of wood floats on water. The buoyant force on wood will be
Why does a piece of ice float on water?
How is the unit bar related to the S.I. unit pascal?
State three factors on which the pressure at a point in a liquid depends.
Pressure at the free surface of a water lake is P1, while at a point at depth h below its free surface is P2. (a) How are P1 and P2 related? (b)Which is more P1 or P2?
The pressure inside a liquid of density p at a depth h is :
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.
Why is a force needed to keep a block of wood inside water?
The upward force that is caused due to the pressure difference in liquid (or fluid) is called ______.
