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Which of the following examples represen...

Which of the following examples represent periodic motion?
(a) A swimmer completing one (return0trip from one bank of a river to other bank. (b) A freely suspended bar megnet displaced from its `N-S` direction and released. (c) A hydrogen molecule rotating about its centre of mass. (d) An arrow released from a bow.

Text Solution

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(a) It is not a periodic motion. Though the motino of a sqimmer is to and fro but will not have a definite period. (b) It is a periodic motion because a freely suspended magnet if once displaced from `N=S` direction and let go, it oscillates about this position. Hence it is simple harmoic motion also.
(c) It is also a periodic motion. (c) It is not a periodic motion.
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Knowledge Check

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