Strength of Materials
If a number of forces act simultaneously on a particle, it is possible

To replace them by a single force
To replace them by a single force through C.G.
To replace them by a couple
Not a replace them by a single force

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Strength of Materials
The weight of a body is due to

gravitational pull exerted by the earth
force of attraction experienced by par-ticles
gravitational force of attraction towards the centre of the earth.
centripetal force of earth

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