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00
2
ii
GmM
KU KU
K
r
+=
+
¡
+= −
which yields
K
= 2
GmM/r
= 5.3
×
10
−
8
J.
(b) Since the
y
component of each force will cancel, the net force points in the –
x
direction, with a magnitude 2
F
x
= 2 (
GmM/r
2
) cos
θ
, where
= tan
−
1
(4/3) = 53
°
. Thus,
the result is
8
net
ˆ
( 6.4 10 N)i.
F
−
=− ×
G
96. The initial distance from each fixed sphere to the ball is
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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, Energy, Potential Energy

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