单词	compound pendulum
释义	compound pendulum A pendulum consisting of a rigid body that is free to swing about a horizontal axis. Suppose that the centre of mass of the rigid body is a distance d from the axis, m is the mass of the body, and I is the moment of inertia of the body about the axis. The equation of motion can be shown to give θ. As with the simple pendulum, this gives approximate simple harmonic motion for small oscillations.
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