The value of radius of earth is _:
Correct answer: A. 6.4 x 10^6 m
- A. 6.4 x 10^6 m
- B. 6.4 x 10^3 m
- C. 64.5 x 10^3 m
- D. 64.5 x 10^6 m
Explanation
This is a fact. The radius of the earth is 6400km or 6.4 x 103m . Therefore the correct option is option A.
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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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