Strength of Materials
The center of gravity of a uniform lamina lies at

the mid point of its axis
the center of heavy portion
All of these
the bottom surface

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Strength of Materials
Kinetic friction is the

Ratio of limiting friction and normal reaction
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

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