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20. If we write
G
rxyz
=++
###
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
bg
##
#
.
ijk
(a) In the above expression, we set (with SI units understood)
x
= –2.0,
y
= 0,
z
= 4.0,
F
x
= 6.0,
F
y
= 0 and
F
z
= 0. Then we obtain
ˆ
(24N m)j.
rF
τ
=× =
⋅
G
GG
(b) The values are just as in part (a) with the exception that now
F
x
= –6.0. We find
ˆ
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 Spring '08
 Any
 Physics

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