Four pendulums A, B, C and D are suspended from the same elastic
support PQ as shown in the figure. A and Care of the same length, while
B is shojter than A and D is longer than A. If A is set into vibrations -
i. What type of vibrations take place in pendulums B and D?
ii. Why does pendulum C come in the state of resonance with
pendulum A?
iii. What will you do to increase the frequency of pendulum
A?
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