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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
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?
Why is the floating ice less submerged in brine than in water?
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.
A weather forecasting plastic balloon of volume 15 m3 contains hydrogen of density 0.09 kg m-3. The volume of equipment carried by the balloon is negligible compared to its own volume. The mass of an empty balloon alone is 7.15 kg. The balloon is floating in air of density of 1.3 kg m-3. Calculate:
(i) The mass of hydrogen in the balloon,
(ii) The mass of hydrogen and balloon,
(iii) The total mass of hydrogen, balloon and equipment if the mass of equipment is x kg,
(iv) The mass of air displaced by balloon and
(v) The mass of equipment using the law of floatation.
Why does a ship make of iron not sink in water, while an iron nail sinks in it?
A rubber ball floats in water with 2/7 of its volume above the surface of the water. Calculate the average relative density of the rubber ball.
How do submarines sink and float in water?
Differentiate positive & negative buoyant.
Assertion (A): Lactometer is used to check the purity of milk.
Reason (R): Lactometer measures the cream content of milk.
