Questions

At what height above the surface of earth does the acceleration due to gravity become 36% of its value on the surface of earth if radius of earth is 6400 km?

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3484 km

4267 km

6824 km

1442 km

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detailed solution

Correct option is B

GMR+h2=36100.GMR2⇒1R+h=6101R⇒h=2R3∴ h=2×64003km=4267 km

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