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प्रश्न
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उत्तर
We can find the relative density of a solid denser than water by following the experiment.
Weighing a solid in air and water
Find the weight (W1 gf) of a solid in the air using a hydrostatic balance.
Tie the solid firmly with a thread and suspend it from the hook. Lower the solid in water and find its weight.
Record the result as shown below:
Weight of solid in air = w1 gf.
Weight of solid in water = W2 gf.
The apparent loss of weight of solid = (W1 - W2 ) gf.
Relative density = W1/ (W1 - W2)
The relative density of the solid = (weight of solid in the air )/(Apparent loss of weight of solid in water).
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संबंधित प्रश्न
State the principle of floatation.
A solid iron ball of mass 500 g is dropped in mercury contained in a beaker. (a) Will the ball float or sink? Give reasons. (b) What will be the apparent weight of the ball?
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.
A body of volume V and density ρs , floats with volume v inside a liquid of density ρL. Show that `"v"/V = ρ_s/ρ_L` .
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Explain the following:
An egg sinks in fresh water but floats in a strong solution of salt.
How does an object’s density determine whether the object will sink or float in water?
Where do we use lactometers?
