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Which of the following examples represen...

Which of the following examples represent periodic motion?
(a) A swimmer completing one (return) trip from one bank of a river to the other and back.
(b) A freely suspended bar magnet 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 motion of a swimmer 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 it go, it oscillates about this position. Hence it is simple harmonic motion also. (c) It is also a periodic motion , (d) It is not a periodic motion.
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