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Two pendulum of length 1.21m and 1m start vibrating. At some instant the two are in the mean position in same phase. After how many vibrations of the longer pendulum will they be in the same phase again?
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Time period of pendulum is proportional to square root of length. In arbitrary units of time the time period of first pendulum is 12 and second is 10. They will sync up and swing together after 60 time units which is after 5 oscillations of first pendulum and 6 oscillations of second pendulum.
mimansha2712:
The answer given is 10.
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