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

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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Strength of Materials
In ideal machines

mechanical advantage is greater than velocity ratio
mechanical advantage is less than velocity ratio
mechanical advantage is unity
mechanical advantage is equal to velocity ratio

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