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

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

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Strength of Materials
Coefficient of friction is the

angle between normal reaction and the resultant of normal reaction and the 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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