The radius of earth is:
Correct answer: B. 6400 km
- A. 6400 m
- B. 6400 km
- C. 6400 cm
- D. 6400 dm
Explanation
B is correct. It is a fact that the radius of the Earth is 6400 km.
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About Gravitation
Newton’s law of universal gravitation relates the force between masses to their masses and separation, while gravitational field strength explains weight and orbital motion. The topic covers satellite velocity and period, escape ideas, weightlessness in free fall, and artificial gravity, which differs from ordinary gravitational attraction.
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