Theory of Machine
For dynamic balancing of a shaft

None of these
Both (A) and (B)
The net dynamic force acting on the shaft is equal to zero
The net couple due to the dynamic forces acting on the shaft is equal to zero

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

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