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प्रश्न
Explain the following statement:
Sleepers are laid below the rails.
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उत्तर
Wide wooden sleepers are placed below the railway tracks so that the pressure exerted by the rails on the ground becomes less.
संबंधित प्रश्न
What is the cause of buoyant force ?
A cork piece floats on water surface while an iron nail sinks in it. Explain the reason.
What is meant by pressure? State its S.I. unit.
Complete the following sentence :
Pressure at a point inside the liquid is ...................... To its depth.
Will a body weigh more in air or vacuum when weighed with a spring balance? Give a reason for your answer.
A body experiences an upthrust F1 in river water and F2 in sea water when dipped up to the same level. Which is more, F1 or F2? Give reason.
What is the centre of buoyancy? State its position for a floating body with respect to the centre of gravity of the body.
A body is held inside water contained in a vessel by tying it with a thread to the base of the vessel. Name the three forces that keep the body in equilibrium, and state the direction in which each force acts.
The base of the cylindrical vessel measures 300 cm2. Water is poured into it up to a depth of 6 cm. Calculate the pressure of water on the base in the vessel.
Salt water provides less buoyant force than freshwater.
