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Physics
Physics
Problem
A research balloon rises to an altitude of
160
km
160\,\text{km}
160
km
above the Earth’s surface. Taking Earth’s radius
R
=
6400
km
R = 6400\,\text{km}
R
=
6400
km
, the percentage decrease in the value of
g
g
g
at that altitude is closest to a)
2.5
%
2.5\%
2.5%
b)
7
%
7\%
7%
c)
3
%
3\%
3%
d)
5
%
5\%
5%
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