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Physics
Physics
Problem
At an altitude
h
h
h
above Earth’s surface, a spacecraft of mass
m
m
m
is attracted by Earth with force
F
1
F_1
F
1
. When it rises to altitude
3
h
3h
3
h
, the force drops to
F
1
4
\dfrac{F_1}{4}
4
F
1
. Taking Earth’s radius as
R
E
R_E
R
E
, the altitude
h
h
h
is a)
0.5
R
E
0.5\,R_E
0.5
R
E
b)
1
3
R
E
\dfrac{1}{3}\,R_E
3
1
R
E
c)
R
E
R_E
R
E
d)
0.2
R
E
0.2\,R_E
0.2
R
E
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