Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

Vary with the configuration of the mechanism
Moves as the mechanism moves, but joints are of permanent nature
Remain in the same place for all configurations of the mechanism
None of the listed here

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

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