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Question 1214
Vectors I: Basics, Dot and Cross Products
2014 Paper 1 Question 3 Variant
Question
Generate new
(i)
Find a unit vector
n
{\mathbf{n}}
n
such that
n
×
(
8
i
+
4
j
+
k
)
=
0.
\mathbf{n} \times (8 \mathbf{i} + 4 \mathbf{j} + \mathbf{k}) = \mathbf{0}.
n
×
(
8
i
+
4
j
+
k
)
=
0
.
[2]
(ii)
Find the cosine of the acute angle between
8
i
+
4
j
+
k
{8 \mathbf{i} + 4 \mathbf{j} + \mathbf{k}}
8
i
+
4
j
+
k
and the
z
-
{z\textrm{-}}
z
-
axis.
[1]
Answer
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