Question

The rotation of earth about its axis is

• A. periodic but not simple harmonic motion.
• B. non-periodic motion
• C. simple harmonic motion.
• D. periodic motion.

Answer 1

Answer: (A), (D)

periodic motion.

The motion of earth about its own axis is circular and it completes one rotation around its axis in 24 hrs and this revolution happens in regular interval of time. So, it is periodic.
But earth does not move to and fro about a mean position, thus, it does not have SHM.

Final Answer: Option (a), (c)