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Linear Algebra : Operations and Properties

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Example Questions

Example Question #11 : Norms

$\bold{v} = \left ( \frac{1}{2},\frac{ \sqrt{2}}{2}, -\frac{1}{2} \right )$

True or false: $\textbf{v}$ is an example of a unit vector.

Possible Answers:

True

False

Correct answer:

True

Explanation:

$\textbf{v}$ is a unit vector if and only if its norm, or length, $\left \| \textbf{v} \right \|$ - the square root of the sum of the squares of its elements - is equal to 1. Find the length using this definition:

$\left \| \textbf{v} \right \| = \sqrt{\left ( \frac{1}{2} \right )^{2}+ \left ( \frac{\sqrt{2}}{2} \right ) ^{2}+ \left ( -\frac{1}{2} \right ) ^{2}}$

$=\sqrt{ \frac{1}{4} + \frac{2}{4} + \frac{1}{4} }$

$=\sqrt{1}$

$\textbf{v}$ is a unit vector.

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Example Question #13 : Norms

Which of these functions could be that of a Euclidean norm operator? You may assume each function is onto.

Possible Answers:

$h: \mathbb{N}^3 \rightarrow \mathbb{Q}$

$g: \mathbb{Q}^2 \rightarrow \mathbb{N}$

All of the other answers are norm operators

$f:\mathbb{R}^7 \rightarrow \mathbb{R}$

Correct answer:

$f:\mathbb{R}^7 \rightarrow \mathbb{R}$

Explanation:

This function's range is $\mathbb{R}$ , the set of all real numbers. In short, this is set of all possible "distances between two given numbers" in elementary linear algebra. would not be a norm. For example, $h(1,1,1) = \sqrt{1+1+1} =\sqrt{3}$ , which is not a rational number (part of $\mathbb{Q}$ ). Similarly, is also not a norm. We have $g(1,1) = \sqrt{1+1} = \sqrt{2}$ , which is not a natural number.

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Example Question #14 : Norms

The taxicab norm on $\mathbb{R}^n$ for a vector (x_1,...,x_n)^T is defined as

||x||_1=|x_1|+...+|x_n|

Given v=(1,2,-3)^T , find ||v||_1 .

Possible Answers:

$||v||_1=\sqrt{6}$

||v||_1=1

||v||_1=0

||v||_1=6

Correct answer:

||v||_1=6

Explanation:

To find ||v||_1 given v=(1,2,-3)^T , we simply do what the taxicab norm formula tells us:

||v||_1=|1|+|2|+|-3|=1+2+3=6

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Example Question #151 : Operations And Properties

Find the euclidean norm of the vector $(\pi,e)$

Possible Answers:

$\pi^2+e^2$

$\sqrt{\pi+e}$

$\sqrt{\pi^2+e^2}$

$\pi+e$

Correct answer:

$\sqrt{\pi^2+e^2}$

Explanation:

To find the euclidean norm of $(\pi,e)$ , we take the sum of the entries squared and take the square root:

$\sqrt{\pi^2+e^2}$

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Example Question #152 : Operations And Properties

Find the euclidean norm of (10,2,5) .

Possible Answers:

$\sqrt{17}$

8.5

$\sqrt{129}$

Correct answer:

$\sqrt{129}$

Explanation:

To find the euclidean norm of (10,2,5) , we take the sum of the entries squared and take the square root:

$\sqrt{10^2+2^2+5^2}=\sqrt{100+4+25}=\sqrt{129}$

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Example Question #153 : Operations And Properties

Find the euclidean norm of (1,1,1,1) .

Possible Answers:

$\sqrt{2}$

1.5

Correct answer:

Explanation:

To find the euclidean norm of (1,1,1,1) , we take the sum of the entries squared and take the square root:

$\sqrt{1^2+1^2+1^2+1^2}=\sqrt{1+1+1=1}=\sqrt{4}=2$

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Example Question #23 : Norms

$\textbf{u} = \left ( \frac{1}{4}, \frac{1}{3} , \ln a \right )$ .

Evaluate to make $\textbf{u}$ a unit vector.

Possible Answers:

0.8188 or 1.2214

0.6592 or 1.5169

$\textbf{u}$ cannot be a unit vector regardless of the value of .

0.8406 or 1.1896

0.4029 or 2.4818

Correct answer:

0.4029 or 2.4818

Explanation:

$\textbf{u}$ is a unit vector if and only if $\left \| \textbf{u} \right \| = 1$

$\left \| \textbf{u} \right \|$ , the norm, or length, of $\textbf{u}$ can be found by adding the squares of the entries and taking the square root of the sum:

$\left \| \textbf{u} \right \| =\sqrt{\left ( \frac{1}{4} \right ) ^{2} +\left ( \frac{1}{3} \right ) ^{2} +( \ln a) ^{2}}$

$\left \| \textbf{u} \right \| =\sqrt{ \frac{1}{16} + \frac{1}{9} +( \ln a) ^{2}}$

$\left \| \textbf{u} \right \| =\sqrt{ \frac{25}{144} +( \ln a) ^{2}}$

Set this expression equal to 1:

$\sqrt{ \frac{25}{144} +( \ln a) ^{2}} = 1$

$\frac{25}{144} +( \ln a) ^{2} = 1$

$( \ln a) ^{2} = \frac{119}{144}$

$\ln a = \pm \frac{\sqrt{119 }}{12 } \approx \pm 0.9091$

$a \approx e^{-0.9091} \approx 0.4029$

$a \approx e^{ 0.9091} \approx 2.4818$

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Example Question #234 : Linear Algebra

$\textbf{u} = \left (\cos \theta , \frac{1}{2} , \frac{2}{3} \right )$

Evaluate $\theta \in [0, 2 \pi]$ (nearest hundredth of a radian) to make $\textbf{u}$ a unit vector.

Possible Answers:

0.59

0.17

1.40

0.99

$\textbf{u}$ cannot be a unit vector regardless of the value of $\theta$ .

Correct answer:

0.99

Explanation:

$\textbf{u}$ is a unit vector if and only if $\left \| \textbf{u} \right \| = 1$

$\left \| \textbf{u} \right \|$ , the norm, or length, of $\textbf{u}$ can be found by adding the squares of the entries and taking the square root of the sum:

$\left \| \textbf{u} \right \| = \sqrt{ \cos^{2} \theta+ \left ( \frac{1}{2} \right ) ^{2}+ \left ( \frac{2}{3} \right ) ^{2}}$

$\left \| \textbf{u} \right \| = \sqrt{ \cos^{2} \theta+ \frac{1}{4} + \frac{4}{9} }$

$\left \| \textbf{u} \right \| = \sqrt{ \cos^{2} \theta+ \frac{25}{36} }$

Set this value equal to 1:

$\sqrt{ \cos^{2} \theta+ \frac{25}{36} } = 1$

$\cos^{2} \theta+ \frac{25}{36} = 1$

$\cos^{2} \theta= \frac{11}{36}$

$\cos \theta=\sqrt{ \frac{11}{36}} \approx 0.5528$

We are looking for a value in radians $\theta \in [0, 2 \pi]$ , so

$\theta \approx \cos^{-1} 0.5528 \approx 0.99$ .

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Example Question #23 : Norms

$\textbf{u} = \left ( \cos \theta , \frac{1}{6}, \sin \theta \right )$ .

To the nearest hundredth (radian), which of the following values of $\theta$ would make $\textbf{u}$ a unit vector?

Possible Answers:

0.59

2.56

2.91

$\textbf{u}$ cannot be a unit vector regardless of the value of $\theta$ .

0.99

Correct answer:

$\textbf{u}$ cannot be a unit vector regardless of the value of $\theta$ .

Explanation:

$\textbf{u}$ is a unit vector if and only if $\left \| \textbf{u} \right \| = 1$

$\left \| \textbf{u} \right \|$ , the norm, or length, of $\textbf{u}$ can be found by adding the squares of the entries and taking the square root of the sum:

$\left \| \textbf{u} \right \| =\sqrt{ \cos ^{2}\theta +\left ( \frac{1}{6} \right ) ^{2} + \sin ^{2}\theta}$

$\left \| \textbf{u} \right \| =\sqrt{ \sin ^{2}\theta+\cos ^{2}\theta + \frac{1}{36} }$

Since by a trigonometric identity,

$\sin ^{2}\theta+\cos ^{2}\theta =1$ for all $\theta$ ,

$\left \| \textbf{u} \right \| =\sqrt{ 1+ \frac{1}{36} }$

$\left \| \textbf{u} \right \| =\sqrt{ \frac{37}{36} } = \frac{\sqrt{ 37 } } {6}$ .

Therefore, for any value of $\theta$ , $\left \| \textbf{u} \right \| \ne 1$ . $\textbf{u}$ cannot be a unit vector.

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Example Question #23 : Norms

$\textbf{u} = \left (\frac{3}{5} \cos \theta ,\frac{4}{5} \sin \theta , -\frac{3}{5} \sin \theta, -\frac{4}{5} \cos \theta \right )$

True or false: $\textbf{u}$ is a unit vector regardless of the value of $\theta$ .

Possible Answers:

True

False

Correct answer:

True

Explanation:

$\textbf{u}$ is a unit vector if and only if $\left \| \textbf{u} \right \| = 1$

$\left \| \textbf{u} \right \|$ , the norm, or length, of $\textbf{u}$ can be found by adding the squares of the entries and taking the square root of the sum:

$\left \| \textbf{u} \right \| =\sqrt{ \left (\frac{3}{5} \cos \theta \right ) ^{2}+ \left (\frac{4}{5} \sin \theta\right )^{2} + \left ( -\frac{3}{5} \sin \theta\right )^{2}+ \left ( -\frac{4}{5} \cos \theta \right )^{2}}$

$\left \| \textbf{u} \right \| =\sqrt{ \frac{9}{25} \cos^{2} \theta + \frac{16}{25} \sin^{2} \theta+ \frac{9}{25} \sin^{2} \theta + \frac{16}{25} \cos^{2} \theta}$

$\left \| \textbf{u} \right \| =\sqrt{ \sin^{2} \theta + \cos^{2} \theta}$

Applying a trigonometric identity:

$\left \| \textbf{u} \right \| =\sqrt{1} = 1$ .

Therefore, $\textbf{u}$ is a unit vector regardless of the value of $\theta$ .

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Linear Algebra : Operations and Properties

Study concepts, example questions & explanations for Linear Algebra

All Linear Algebra Resources

Example Questions

Example Question #11 : Norms

Example Question #13 : Norms

Example Question #14 : Norms

Example Question #151 : Operations And Properties

Example Question #152 : Operations And Properties

Example Question #153 : Operations And Properties

Example Question #23 : Norms

Example Question #234 : Linear Algebra

Example Question #23 : Norms

Example Question #23 : Norms

All Linear Algebra Resources

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