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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
Complete the following sentence :
Pressure at a point inside the liquid is ...................... To its depth.
The S.I. unit of pressure is :
The pressure P1 at the top of a dam and P2 at a depth h form the top inside water (density p) are related as :
- Calculate the height of a water column which will exert on its base the same pressure as the 70 cm column of mercury. Density of mercury is 13.6 g cm-3.
- Will the height of the water column in part (a) change if the cross-section of the water column is made wider?
What is the cause of upthrust? At which point can it be considered to act?
Complete the following sentence :
Two balls, one of iron and the other of aluminium experience the same upthrust when dipped completely in water if _____________ .
What is the centre of buoyancy? State its position for a floating body with respect to the centre of gravity of the body.
Calculate the hydrostatic pressure exerted by water at the bottom of a beaker. Take the depth of water as 40 cm, the density of water 1000 kgm−3 and g = 9.8 ms−2.
Define atmospheric pressure diving suits. Does a diving suit create buoyancy?
The point at which the force of buoyancy is supposed to act is known as ______.
