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

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

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Theory of Machine
Open pairs are those which have

Elements of pairs not held together mechanically
Point or line contact between the two elements when in motion
Two elements that permit relative motion
Surface contact between the two elements when in motion

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