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    Pendulum wave - Wikipedia

    A pendulum wave is an elementary physics demonstration and kinetic art comprising a number of uncoupled simple pendulums with monotonically increasing lengths. As the pendulums oscillate, they appear to produce travelling and standing waves, beating, and random motion. 展开

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    Ernst Mach designed and constructed the first pendulum wave demonstration around 1867 at Charles-Ferdinand University in Prague. In the Czech Republic, the demonstration is called 展开

    Newton's cradle – a set of pendulums constrained to swing along the axis of the apparatus and collide with one another 展开

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