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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a
3484 km
b
4267 km
c
6824 km
d
1442 km
answer is B.
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Detailed Solution
GMR+h2=36100.GMR2⇒1R+h=6101R⇒h=2R3∴ h=2×64003km=4267 km
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?