If a hole is bored through the center of the earth and a pebble is dropped in it, then it will:
Correct answer: C. Execute SHM
- A. Stop at the center of the earth
- B. Drop to the other side
- C. Execute SHM
- D. None of the above.
Explanation
The pebble would fall down to the other side and in a ideal situation would oscillate between the two ends in simple harmonic motion. Therefore the answer would be C.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
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About Simple Harmonic Motion
Simple harmonic motion is oscillation in which acceleration is directly proportional to displacement and directed toward the equilibrium position. Work includes displacement, velocity, acceleration, phase, period, frequency, amplitude and energy, with applications to springs and simple pendulums. The restoring force and the conditions for SHM distinguish it from general periodic motion.
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