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Q: Calculate the work done by the force of gravity when a satellite moves in the orbit of radius 40,000 km around the earth is-
  • A. 0 J
  • B. 4000 J
  • C. 8000 J
  • D. 400000 J
Correct Answer: Option A - When a satellite moves around the earth, then the direction of the force of gravity on the satellite is perpendicular to its displacement. Hence, the work done on the satellite by the force of gravity is zero.
A. When a satellite moves around the earth, then the direction of the force of gravity on the satellite is perpendicular to its displacement. Hence, the work done on the satellite by the force of gravity is zero.

Explanations:

When a satellite moves around the earth, then the direction of the force of gravity on the satellite is perpendicular to its displacement. Hence, the work done on the satellite by the force of gravity is zero.