1) find the acceleration of gravity at an altitude 900km
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Explanation:
ceteration due to gravity at height h,
g
n
=g
0
(1−
R
2h
) h=1km
Acceleration due to gravity at depth d,
d
d
=g
0
(1−
R
d
)
g
h
=g
d
g
0
(1−
R
2h
)=g
0
(1−
R
d
)
→d=2h
=2×1km
d=2km
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