Advertisements
Advertisements
प्रश्न
A piece of ice floating in a glass of water melts, but the level of water in the glass does not change.
Give reasons.
Hint: Ice contracts on melting.
Advertisements
उत्तर १
When a floating piece of ice melts into water, it contracts by the volume equal to the volume of ice pieces above the water surface while floating on it. Hence, the level of water does not change when ice floating on it melts.
उत्तर २
The fractional part submerged equals the ratio of the density of the material of the block to the density of the liquid.
(Density of floating body / Density of liquid) = fraction submerged.
The Fraction of ice submerged in the water remain the same as the density of ice and water remain the same during melting. As the ice melts some volume of ice decrease and converts into water and volume of water increase by the same amount. So, the level of water remains the same during melting.
संबंधित प्रश्न
When a piece of wood is suspended from the hook of a spring balance, it reads 70 gf. The wood is now lowered into water. What reading do you expect on the scale of spring balance?
Explain the following :
Icebergs floating in sea are dangerous for ships.
A body of weight W is floating in a liquid. Its apparent weight will be
Why does a ship make of iron not sink in water, while an iron nail sinks in it?
Why does a helium balloon float in air?
State the laws of flotation.
Hydrometer is based on the principle of ______.
Describe the purpose, principle, and working of the Lactometer.
Assertion (A): Lactometer is used to check the purity of milk.
Reason (R): Lactometer measures the cream content of milk.
