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

kG + l₁
(kG² + l₁²)/ l₁
kG² + l₁
(kG + l₁²)/ l₁

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Theory of Machine
Inertia force acts

Along the direction of acceleration force
Perpendicular to the acceleration force
Opposite to the direction of acceleration force
None of the listed here

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