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प्रश्न
Explain why it is easier to lift a stone under water than in air.
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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
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संबंधित प्रश्न
Equal volumes of the two different substances have equal masses.
The density of a piece of brass will change by changing its size or shape.
Match the following :
| Column A | Column B | ||
| (a) | kg `m^-3` | (i) | relative density |
| (b) | no unit | (ii) | sinks in alcohol |
| (c) | relative density | (iii) | floats on water |
| (d) | iron | (iv) | density |
| (e) | wood | (v) | density bottle |
The correct relation is
The correct statement is
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
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You are required to take out 200 ml of milk from a bucket full of milk. How will you do it?
The mass of 5 litre of water is 5 kg. Find the density of water in g cm-3.
A cubical tank of side 1 m is filled with 800 kg of a liquid. Find:
(i) the volume of tank,
(ii) the density of liquid in kg m-3.
