Engineering Mechanics
The equivalent length of a simple pendulum which gives the same frequency as compound pendulum is

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

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Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Do not meet at one point, but their lines of action lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
Meet at one point and their lines of action also lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane

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