Multiple choice

An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth.

  1. does not exist at such distance.

  2. is neutralized by the attraction of the moon.

  3. provides the necessary speed for its steady motion.

  4. provides the necessary acceleration for its motion.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An artificial satellite moving round the Earth in a circular orbit possesses an acceleration, which is constant in magnitude but changing in direction,. The artificial satellite revolves round the Earth under centripetal acceleration. The launched satellite should have the speed enough so that gravity doesn't bring the satellite back to the Earth, but no so great that it escapes in the space. It means the speed provided by the rocket is the source of centrifugal force, and the Earth's attraction holds it from  moving away from this centrifugal force.

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