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21. If we write
G
rx yz
=
###
i + j+ k, then (using Eq. 330) we find
G
G
r
F
×
is equal to
yF
zF
zF
xF
xF
yF
zy
xz
y x
−−−
di
b
g
##
#
i+
j+
k.
With (using SI units)
x
= 0,
y
= – 4.0,
z
= 5.0,
F
x
= 0,
F
y
= –2.0 and
F
z
= 3.0 (these latter
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 Spring '08
 Any
 Physics, Force

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