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(b) 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
b
g
##
#
.
ijk
With
x
= 2.0,
z
= –2.0,
F
y
= 4.0 and all other components zero (and SI units understood)
the expression above yields
G
G
G
τ
=× =
+
⋅
rF
80
.
#
.
#
ik
N
m
.
e
j
29. (a) We use
G
A
G
G
=×
mr
v
, where
G
r
is the position vector of the object,
G
v
is its velocity
vector, and
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 Spring '08
 Any
 Physics, Mass

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