Theory of Machine
The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is

h/(kG² + h²)
(kG² + h²)/h²
(kG² + h²)/h
h²/(kG² + h²)

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

The algebraic sum of the secondary forces must be equal to zero
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
Both (A) and (B)
None of these

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