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
Correct options are A) and C) (a) (c) : The motion of earth about its own axis is circular and complete its one complete revolution in regular interval of time. So it periodic. But motion is not about a fixed point from which we can measure it's displacement or about which it moves both side so it is not simple harmonic motion. So verifies the option (a) and (c).
