Theory of Machine
The maximum fluctuation of speed is the

Difference of the maximum and minimum speeds
Difference of minimum fluctuation of speed and the mean speed
Variations of speed above and below the mean resisting torque line
Sum of maximum and minimum speeds

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

The friction force is independent of me area of contact.
The friction force is directly proportional to the normal force.
All of these
The friction force is dependent on the materials of the contact surfaces.

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