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

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

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Engineering Mechanics
The moment of a force

All of these
Is the turning effect produced by a force, on the body, on which it acts
Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force
Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken

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