Oh, come on, vectors aren't all that bad. Are they?
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Question 1
Line $l_1$ has the equation $\mathbf{r}= \begin{pmatrix}1\\2\\2 \end{pmatrix} + \lambda \begin{pmatrix}4\\-3\\3\end{pmatrix}$.
Line $l_2$ has the equation $\mathbf{r}= \begin{pmatrix}5\\3\\1 \end{pmatrix} + \mu \begin{pmatrix}-12\\5\\-5\end{pmatrix}$.
Where do lines $l_1$ and $l_2$ intersect?
A
You can't fool me, they don't!
B
$\begin{pmatrix}1\\2\\2\end{pmatrix}$
C
$\begin{pmatrix}17\\-2\\8\end{pmatrix}$
D
$\begin{pmatrix}-7\\8\\-4\end{pmatrix}$
E
$\begin{pmatrix}5\\-1\\5\end{pmatrix}$
Question 2
Point $A$ is at $\begin{pmatrix} 9\\ 0 \\ 3 \\ \end{pmatrix}$ and point $B$ is at $\begin{pmatrix} -3\\ 8 \\ -3 \\ \end{pmatrix}$. Which of the following is an equation of the line through $A$ and $B$?
Point $A$ is at $\begin{pmatrix} 9\\ 0 \\ 3 \\ \end{pmatrix}$ and point $B$ is at $\begin{pmatrix} -3\\ 8 \\ -3 \\ \end{pmatrix}$. What is the distance $AB$?
A
$\sqrt{244}$
B
$109$
C
$26$
D
$244$
E
$71$
Question 4
Line $l_1$ has the equation $\mathbf{r}= \begin{pmatrix}1\\2\\2 \end{pmatrix} + \lambda \begin{pmatrix}4\\-3\\3\end{pmatrix}$.
Point $C$ has co-ordinates $(-1,3,0)$
Point $P$ lies on $l_1$ such that the vector $CP$ is perpendicular to $l_1$. What are the co-ordinates of $P$?
A
$(3, 0.5, 3.5)$
B
There is no such point.
C
$(-1, 3.5, 0.5)$
D
$(2,3,0)$
E
$(5,-1,5)$
Question 5
Line $l_1$ has the equation $\mathbf{r}= \begin{pmatrix}1\\2\\2 \end{pmatrix} + \lambda \begin{pmatrix}4\\-3\\3\end{pmatrix}$.
Line $l_2$ has the equation $\mathbf{r}= \begin{pmatrix}5\\3\\3 \end{pmatrix} + \mu \begin{pmatrix}-12\\5\\-7\end{pmatrix}$.
What is the acute angle between $l_1$ and $l_2$?
A
None of these
B
43º
C
13º
D
137º
E
167º
Question 6
Point $A$ is at $\begin{pmatrix} 9\\ 0 \\ 3 \\ \end{pmatrix}$ and point $B$ is at $\begin{pmatrix} -3\\ 8 \\ -3 \\ \end{pmatrix}$. What is the vector $AB$?
A
$\begin{pmatrix}
-12 \\ 8 \\ -6 \\
\end{pmatrix}$
B
109º
C
$\sqrt{244}$
D
$\begin{pmatrix}
12\\ -8 \\ 6 \\
\end{pmatrix}$
E
71º
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Colin
Colin is a Weymouth maths tutor, author of several Maths For Dummies books and A-level maths guides. He started Flying Colours Maths in 2008.
He lives with an espresso pot and nothing to prove.
In the question about the equation for the line through A and B, your TeX isn’t rendering properly.
The question about the acute angle between l1 and l2, I think the answer should be none of these since the lines don’t intersect. Then the next question asks about their intersection point and I still think they don’t intersect! Maybe I’m making a huge mistake here. I get $\lambda = -2$ and $\mu = 1$ to make the $x$ and $y$ coordinates match, but then I get $-4$ and $-6$ for the $z$ coordinate.
Also you shouldn’t say “the equation”, you should say “an equation”.
MathbloggingAll
C4 Vectors quiz http://t.co/9bpTtnvZWr
Joshua Zucker
In the question about the equation for the line through A and B, your TeX isn’t rendering properly.
The question about the acute angle between l1 and l2, I think the answer should be none of these since the lines don’t intersect. Then the next question asks about their intersection point and I still think they don’t intersect! Maybe I’m making a huge mistake here. I get $\lambda = -2$ and $\mu = 1$ to make the $x$ and $y$ coordinates match, but then I get $-4$ and $-6$ for the $z$ coordinate.
Also you shouldn’t say “the equation”, you should say “an equation”.