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In the diagram below, A, B, C, D are fou...

In the diagram below, A, B, C, D are four pendulums suspended from the same elastic string PQ. The length of A and Care equal to each other while the length of pendulum B is smaller than that of D. Pendulum A is set into a mode of vibrations.

Name the type of vibrations taking place in pendulums B and D?

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Forced vibration
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