Strength of Materials
The center of gravity of a triangle lies at the point of

Concurrence of the medians
Intersection of its altitudes
Intersection of diagonals
Intersection of bisector of angles

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Strength of Materials
The weight of a body is due to

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

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Strength of Materials
Coefficient of friction is the

ratio of limiting friction and normal reaction
angle between normal reaction and the resultant of normal reaction and the limiting friction
the friction force acting when the body is in motion
the friction force acting when the body is just about to move

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