Theory of Machine
When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be

ω² r {n/(n + 1)}
ω² r {(n + 1)/n}
ω² r {(n - 1)/n}
ω² r {n/(n - 1)}

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Theory of Machine
The maximum fluctuation of energy is the

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

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