Theory of Machine
A Hartnell governor is a

Spring loaded governor
Pendulum type governor
Dead weight governor
Inertia governor

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

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