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31.
REASONING
The gravitational force that the sun exerts on a person standing on
the earth is given by Equation 4.3 as
2
sun
sun
sunearth
/
FG
M
m
r
=
, where
M
sun
is the mass of
the sun,
m
is the mass of the person, and
r
sunearth
is the distance from the sun to the earth.
Likewise, the gravitational force that the moon exerts on a person standing on the earth is
given by
2
moon
moon
moonearth
/
M
m
r
=
, where
M
moon
is the mass of the moon and
r
moon
earth
is the distance from the moon to the earth. These relations will allow us to determine
whether the sun or the moon exerts the greater gravitational force on the person.
SOLUTION
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 Spring '08
 SOFFER

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