Strength of Materials
Which of the following is the example of lever of first order?

Arm of man
Pair of scissors
All of the listed here
Pair of clinical tongs

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Strength of Materials
Limiting force of friction is the

the friction force acting when the body is in motion
Ratio of limiting friction and normal reaction
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 limiting friction

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Strength of Materials
Coefficient of friction is the

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

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