If a satellite moves above Earth's atmosphere in a circular orbit with constant speed, then:
Correct answer: B. its acceleration is toward the Earth
- A. its acceleration and velocity are always in the same direction
- B. its acceleration is toward the Earth
- C. its velocity is constant
- D. it will fall back to Earth when its fuel is used up
Explanation
Artificial satellites are put into their orbits by rockets and are held in orbits by the gravitational pull of the Earth. The rocket will have an acceleration of 9.8 ms-2 towards the centre of Earth.
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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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