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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
Relative density of water is 1.0.
1 g cm-3 = ......... Kg m-3.
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 statement is
It is easier to swim in sea water than in river water. Explain the reason.
Calculate the volume of wood of mass 6000 kg if the density of wood is 0.8 g Cm-3
The mass of an empty density bottle is 21.8 g when filled completely with water is 41.8 g and when filled completely with liquid it is 40.6 g. Find
- the volume of density bottle.
- the relative density of liquid.
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
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 volume of density bottle.
The mass of 5 litre of water is 5 kg. Find the density of water in g cm-3.
