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.
Density of water is .......Kg m-3.
It is easier to swim in sea water than in river water. Explain the reason.
What is a submarine? How can it be made to dive in water and come to the surface of water?
The density of alcohol is 600 kg m-3. Express it in g Cm-3.
The mass of an empty density bottle is 21.8 g when filled completely with water is 41.8 g and when filled completely with liquid it is 40.6 g. Find
- the volume of density bottle.
- the relative density of liquid.
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
The mass of an empty density bottle is 30 g, it is 75 g when filled completely with water and 65 g when filled completely with a liquid. Find density of liquid.
The mass of an empty density bottle is 30 g, it is 75 g when filled completely with water and 65 g when filled completely with a liquid. Find relative density of liquid.
The mass of 5 litre of water is 5 kg. Find the density of water in g cm-3.
