18.
REASONING
The magnitude of the gravitational force that each part exerts on
the other is given by Newton’s law of gravitation as
2
12
/
FG
m
mr
=
.
To use this
expression, we need the masses
m
1
and
m
2
of the parts, whereas the problem statement
gives the weights
W
1
and
W
2
.
However, the weight is related to the mass by
W
=
mg
, so
that for each part we know that
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This note was uploaded on 01/29/2010 for the course CALC 01:640:135 taught by Professor Soffer during the Spring '08 term at Rutgers.
 Spring '08
 SOFFER

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