Advertisements
Advertisements
प्रश्न
Explain why it is easier to lift a stone under water than in air.
उत्तर
A stone is easier to lift in water because the buoyant force of the water acts on the stone which counter-balances the weight of the stone acting downward and this makes the stone lighter.
In the air, the gravity tries to pull the stone downwards and hence we require more force to lift up the stone
APPEARS IN
संबंधित प्रश्न
Equal volumes of the two different substances have equal masses.
Relative density of water is 1.0.
The correct relation is
A block of wood of density 0.8 g cm-3 has a volume of 60 cm3. The mass of block is
It is easier to swim in sea water than in river water. Explain the reason.
Icebergs floating on sea water are dangerous for ships. Explain the reason.
The density of aluminium is 2.7 g cm3. Express it in kg m-3
Calculate the volume of wood of mass 6000 kg if the density of wood is 0.8 g Cm-3
From the following observations, calculate the density and relative density of a brine solution.
Mass of empty density bottle = 22 g
Mass of bottle + water = 50 g
Mass of bottle + brine solution = 54 g
A cubical tank of side 1 m is filled with 800 kg of a liquid. Find:
(i) the volume of tank,
(ii) the density of liquid in kg m-3.
