Theory of Machine
Tangential acceleration direction is

Along the angular velocity
Opposite to angular velocity
May be any one of these
Perpendicular to angular velocity

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Theory of Machine
The maximum fluctuation of energy is the

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

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