Theory of Machine
Sense of tangential acceleration of a link

Is same as that of velocity
Could be either same or opposite to velocity
Is opposite to that of velocity
Is perpendicular to that of velocity

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Theory of Machine
A governor is said to be stable, if the

Radius of rotation of balls decreases as the equilibrium speed increases
Radius of rotation of balls decreases as the equilibrium speed decreases
Radius of rotation of balls increases as the equilibrium speed decreases
Radius of rotation of balls increases as the equilibrium speed increases

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