An artificial satellite orbiting around the earth does not fall down because the attraction of the earth
Correct answer: D. provides the necessary acceleration for its motion in a curved path
- A. vanishes at such distances
- B. is balanced by the attraction of the moon
- C. is balanced by the centrifugal force
- D. provides the necessary acceleration for its motion in a curved path
Explanation
An artificial satellite orbiting around the Earth does not fall down because the gravitational force of the Earth provides the necessary centripetal acceleration for the satellite's motion in a curved path. The satellite moves at a constant speed while continuously falling toward the Earth, but its forward motion matches the curvature of the Earth, leading to a stable orbit.
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About Satellite Motion and Orbital Velocity
Satellite motion uses gravitational force as the centripetal force required for circular orbit, giving relationships among orbital radius, period and orbital velocity. Questions cover geostationary conditions and weightlessness, while distinguishing orbital velocity, escape velocity and the satellite's tangential speed.
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