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प्रश्न
What is a submarine? How can it be made to dive in water and come to the surface of water?
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उत्तर
SUBMARINE: Submarine is a water-tight boat which can travel underwater like a ship. It is provided with water tanks. When the submarine is to dive, water is filled in water tanks, it is made heavier and average density of submarine becomes greater than the density of seawater and it sinks. To make the submarine rise to the surface of the water, water tanks are emptied. This makes the average density of submarine becomes less than the density of seawater and it rises to surface.
While a submarine is underwater soldiers can see the enemy activities through the periscope.
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संबंधित प्रश्न
Equal volumes of the two different substances have equal masses.
When a body is immersed in a liquid, the buoyant force experienced by the body is equal to the volume of the liquid displaced by it.
Mass = density x .........
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
A block of wood of density 0.8 g cm-3 has a volume of 60 cm3. The mass of block is
It is easier to swim in sea water than in river water. Explain the reason.
The density of aluminium is 2.7 g cm3. Express it in kg m−3.
The mass of an empty density bottle is 30 g, it is 75 g when filled completely with water and 65 g when filled completely with a liquid. Find relative density of liquid.
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.
