Theory of Machine
According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on A. A triangle

Two lines
A triangle
A point
A straight line

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Theory of Machine
The maximum fluctuation of energy is the

Difference between the maximum and minimum energies
Ratio of the mean resisting torque to the work-done per cycle
Sum of the maximum and minimum energies
Variations of energy above and below the mean resisting torque line

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