Strength of Materials
Center of percussion is

point of suspension
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
the point of C.G.
the point of metacentre

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Strength of Materials
Limiting force of friction is the

Ratio of limiting friction and normal reaction
Tangent of angle between normal reaction and the resultant of normal reaction and 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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Strength of Materials
Which one of the following statements is not correct

the tangent of the angle of friction is equal to coefficient of friction
the sine of the angle of repose is equal to coefficient to friction
the angle of repose is equal to angle of friction
the tangent of the angle of repose is equal to coefficient of friction

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