Question

Observe the diagram which shows four pendulum suspended from a flexible string tied between fixed support. With respect to the diagram answer the questions that follow:-


i) Name the pendulum with maximum frequency and the pendulum with minimum frequency
ii) Which pendulum /s will start vibrating if pendulum A is disturbed once and name the vibrations of pendulum A
iii) When pendulum D is disturbed once all the remaining pendulums start vibrating. Name the vibration in each of these pendulums.​

Answer 1

(i) B and D would be in the state of force vibration.

(ii) Since the length of pendulum C is same as that of A therefore it is in the state of resonance.

(iii) The pendulum C has its length same as that of A therefore its natural time period is also same that of A and both remain in same phase; so resonance takes place. But B's length is lesser than the length of A hence B would vibrate with smaller amplitude.