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

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

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Strength of Materials
Limiting force of friction is the

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

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