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प्रश्न
Explain the following:
An egg sinks in fresh water but floats in a strong solution of salt.
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उत्तर
The density of egg is greater than fresh water so it sinks in fresh water but due to the addition of salt density of water increases which makes the density of salt water greater than egg and hence floats in a strong solution of salt.
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संबंधित प्रश्न
A body is held immersed in a liquid. (i) Name the two forces acting on the body and draw a diagram to show these forces. (ii) State how the magnitudes of two forces mentioned in part (i) determine whether the body will float or sink in liquid when it is released. (iii) What is the net force on the body if it (a) sinks and (b) floats?
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?
A block of wood is so loaded that it just floats in water at room temperature. What change will occur in the state of floatation, if
(a) Some salt is added to water, (b) Water is heated?
Give reasons.
Explain the following :
Icebergs floating in sea are dangerous for ships.
For a floating body, its weight W and upthrust FB on it are related as :
A body floats in a liquid A of density ρ1 with a part of it submerged inside the liquid, while in liquid B of density ρ2 it is totally submerged inside the liquid. The densities ρ1 and ρ2 are related as :
Why does a ship make of iron not sink in water, while an iron nail sinks in it?
Explain the following:
Icebergs floating in the sea are very dangerous for ships.
Name different types of Hydrometers with their applications.
