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

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

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Strength of Materials
Kinetic friction is the

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

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