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Problem
Problem
If the vectors
P
=
a
i
^
+
a
j
^
+
3
k
^
\mathbf{P} = a\hat{i} + a\hat{j} + 3\hat{k}
P
=
a
i
^
+
a
j
^
+
3
k
^
and
Q
=
a
i
^
−
2
j
^
−
k
^
\mathbf{Q} = a\hat{i} - 2\hat{j} - \hat{k}
Q
=
a
i
^
−
2
j
^
−
k
^
are perpendicular to each other, then the positive value of
a
a
a
is a. zero b. 1 c. 2 d. 3
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