The rotation of the earth about its axis is:
| (a) | periodic motion |
| (b) | simple harmonic motion |
| (c) | periodic but not simple harmonic motion |
| (d) | non-periodic motion |
Choose the correct alternatives:
1. (a), (b), (d)
2. (a), (c)
3. (b), (d)
4. (c), (d)
(1, 3) Hint: In SHM, the body does to and fro motion.
The rotation of the earth about its axis is periodic because it repeats after a regular interval of time.
The rotation of the earth is obviously not a to and fro type of motion about a fixed point, hence its motion is not SHM.
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