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77. We note that
r
A
(the distance from the origin to sphere
A
, which is the same as the
separation between
A
and
B
) is 0.5,
r
C
= 0.8, and
r
D
= 0.4 (with SI units understood). The
force
k
F
G
that the
k
th
sphere exerts on
m
B
has magnitude
2
/
kB k
Gm m
r
and is directed from
the origin towards
m
k
so that it is conveniently written as
()
23
ˆˆ
ˆ
ˆ
=i
+
j
=
i
+
j
.
kB
k
k
kk
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Force

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