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In the diagram below, A,B,C,D are four pendulums suspended from the same elastic string PQ. The length of A and C are equal to each other while the lenght of pendulum B is smaller than that of D. Pendulum A is set in to a mode of vibrations.(i) Name the type of vibrations taking place in pendulums B and D?(ii) what is the state of pendulum C?(iii) State the reason for the type of vibrations in pendulums B and C. |
Answer» (i) Forced vibration (ii) Pendulum C is in a state of resonance with Pendulum A. Also they are in the same phase. (iii) This is because the time period of pendulum B is different from that of C (since length of the pendulums B and C are different ). |
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