Advertisements
Advertisements
प्रश्न
Explain the following statement:
Sleepers are laid below the rails.
उत्तर
Wide wooden sleepers are placed below the railway tracks so that the pressure exerted by the rails on the ground becomes less.
APPEARS IN
संबंधित प्रश्न
What do you mean by buoyancy?
Describe an experiment to determine the density of the material of a coin.
What is a density bottle? How is it used to find the density of a liquid?
What physical quantity is measured in bar?
A piece of wood if left under water comes to the surface. Explain the reason.
Describe an experiment to show that a body immersed in a liquid appears lighter than it really is.
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.
A homogeneous block floats on water (a) partly immersed (b) completely immersed. In each case state the position of centre of buoyancy B with respect to the centre of gravity G of the block.
The point at which the force of buoyancy is supposed to act is known as ______.
Assertion (A): The buoyant force on a submerged rigid object can be considered to be acting at the center of mass of the object.
Reason (R): In rigid body, force distributed uniformly through its volume can be considered to be acting at the centre of mass of the body.
