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)
| (a) | periodic motion. |
| (b) | simple harmonic motion. |
| (c) | periodic but not simple harmonic motion. |
| (d) | non-periodic motion. |
| 1. | (a) and (c) only |
| 2. | (a), (b) and (c) only |
| 3. | (b) and (d) only |
| 4. | (d) only |