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(a) In the above expression, we set (with SI units understood)
x
= 0,
y
= – 4.0,
z
= 3.0,
F
x
= 2.0,
F
y
= 0 and
F
z
= 0. Then we obtain
()
ˆˆ
6.0j 8.0k N m.
rF
τ
=× =
+
⋅
G
GG
This has magnitude
22
(6.0 N m)
(8.0 N m)
10 N m
⋅+
⋅
=
⋅
and is seen to be parallel to
the
yz
plane. Its angle (measured counterclockwise from the +
y
direction) is
tan
.
−
=°
1
86
53
bg
(b) In the above expression, we set
x
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 Spring '08
 Any
 Physics

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