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Calculus 2 : Parametric, Polar, and Vector

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9 Diagnostic Tests 308 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #1074 : Calculus Ii

What is the cross product of $a=\left \langle 9,8,7\right \rangle$ and $b=\left \langle 0,1,2\right \rangle$ ?

Possible Answers:

$\left \langle -9, 18, 9 \right \rangle$

$\left \langle -9, -18, -9 \right \rangle$

$\left \langle -9, -18, 9 \right \rangle$

$\left \langle -9, 18, -9 \right \rangle$

$\left \langle 9, 18, 9 \right \rangle$

Correct answer:

$\left \langle 9, 18, 9 \right \rangle$

Explanation:

In order to find the cross product of two three-dimensional vectors, we must find the determinant of a matrix comprised of the vectors' elements. That is, if $a=\left \langle a_{1},a_{2},a_{3}\right \rangle$ and $b=\left \langle b_{1},b_{2},b_{3}\right \rangle$ , then

$a\times b=\begin{Bmatrix} i&j &k \\ a_{1}&a_{2} &a_{3} \\ b_{1}&b_{2} &b_{3} \end{Bmatrix}=\left \langle a_{2}b_{3}-a_{3}b_{2}, a_{1}b_{3}-a_{3}b_{1},a_{1}b_{2}-a_{2}b_{1} \right \rangle$ .

Given $a=\left \langle 9,8,7\right \rangle$ and $b=\left \langle 0,1,2\right \rangle$ , the cross product $a \times b$ is:

$\begin{Bmatrix} i&j &k \\ 9&8 &7 \\ 0&1 &2 \end{Bmatrix}$

$=\left \langle (8)(2)-(7)(1), (9)(2)-(7)(0), (9)(1)-(8)(0) \right \rangle$

$=\left \langle 16-7, 18-0, 9-0 \right \rangle$

$=\left \langle 9, 18, 9 \right \rangle$

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Example Question #1075 : Calculus Ii

What is the cross product of $a=\left \langle 7,-4,3\right \rangle$ and $b=\left \langle 5,-5,5\right \rangle$ ?

Possible Answers:

$\left \langle 5, 20, -15 \right \rangle$

$\left \langle -5,-20, -15 \right \rangle$

$\left \langle -5, 20, 15 \right \rangle$

$\left \langle -5, 20, -15 \right \rangle$

$\left \langle 5, 20, 15 \right \rangle$

Correct answer:

$\left \langle -5, 20, -15 \right \rangle$

Explanation:

$a\times b=\begin{Bmatrix} i&j &k \\ a_{1}&a_{2} &a_{3} \\ b_{1}&b_{2} &b_{3} \end{Bmatrix}=\left \langle a_{2}b_{3}-a_{3}b_{2}, a_{1}b_{3}-a_{3}b_{1},a_{1}b_{2}-a_{2}b_{1} \right \rangle$ .

Given $a=\left \langle 7,-4,3\right \rangle$ and $b=\left \langle 5,-5,5\right \rangle$ , the cross product $a \times b$ is:

$\begin{Bmatrix} i&j &k \\ 7&-4 &3 \\ 5&-5 &5 \end{Bmatrix}$

$=\left \langle (-4)(5)-(3)(-5), (7)(5)-(3)(5), (7)(-5)-(-4)(5) \right \rangle$

$=\left \langle -20+15, 35-15, -35+20 \right \rangle$

$=\left \langle -5, 20, -15 \right \rangle$

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Example Question #1076 : Calculus Ii

What is the cross product of $a=\left \langle 0,-3,3\right \rangle$ and $b=\left \langle -3,0,3\right \rangle$ ?

Possible Answers:

$\left \langle -9, 9,-9 \right \rangle$

$\left \langle 9, -9,-9 \right \rangle$

$\left \langle -9, -9,-9 \right \rangle$

$\left \langle 9, 9,-9 \right \rangle$

$\left \langle 9, 9,9 \right \rangle$

Correct answer:

$\left \langle -9, 9,-9 \right \rangle$

Explanation:

$a\times b=\begin{Bmatrix} i&j &k \\ a_{1}&a_{2} &a_{3} \\ b_{1}&b_{2} &b_{3} \end{Bmatrix}=\left \langle a_{2}b_{3}-a_{3}b_{2}, a_{1}b_{3}-a_{3}b_{1},a_{1}b_{2}-a_{2}b_{1} \right \rangle$ .

Given $a=\left \langle 0,-3,3\right \rangle$ and $b=\left \langle -3,0,3\right \rangle$ , the cross product $a \times b$ is:

$\begin{Bmatrix} i&j &k \\ 0&-3 &3 \\ -3&0 &3 \end{Bmatrix}$

$=\left \langle (-3)(3)-(3)(0), (0)(3)-(3)(-3), (0)(0)-(-3)(-3) \right \rangle$

$=\left \langle -9-0, 0+9, 0-9 \right \rangle$

$=\left \langle -9, 9,-9 \right \rangle$

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Example Question #214 : Vector

What is the dot product of $a=\left \langle 3,5,7\right \rangle$ and $b=\left \langle -4,-1,2\right \rangle$ ?

Possible Answers:

Correct answer:

Explanation:

The dot product of two vectors is the sum of the products of the vectors' corresponding elements. Given $a=\left \langle 3,5,7\right \rangle$ and $b=\left \langle -4,-1,2\right \rangle$ , then:

$\left \langle 3,5,7\right \rangle\times \left \langle -4,-1,2\right \rangle$

$=(3\times -4)+(5\times -1)+(7\times 2)$

=(-12)+(-5)+(14)

=-17+14

=-3

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Example Question #215 : Vector

What is the dot product of $a=\left \langle 2,0,-2\right \rangle$ and $b=\left \langle 6,1,7\right \rangle$ ?

Possible Answers:

Correct answer:

Explanation:

The dot product of two vectors is the sum of the products of the vectors' corresponding elements. Given $a=\left \langle 2,0,-2\right \rangle$ and $b=\left \langle 6,1,7\right \rangle$ then:

$\left \langle 2,0,-2\right \rangle\times \left \langle 6,1,7\right \rangle$

$=(2\times 6)+(0\times 1)+(-2\times7)$

=12+0-14

=-2

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Example Question #216 : Vector

What is the dot product of $a=\left \langle 0,5,1\right \rangle$ and $b=\left \langle 5,1,0\right \rangle$ ?

Possible Answers:

Correct answer:

Explanation:

The dot product of two vectors is the sum of the products of the vectors' corresponding elements. Given $a=\left \langle 0,5,1\right \rangle$ and $b=\left \langle 5,1,0\right \rangle$ , then:

$\left \langle 0,5,1\right \rangle\times\left \langle 5,1,0\right \rangle$

$=(0\times5)+(5\times1)+(1\times0)$

=0+5+0

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Example Question #561 : Parametric, Polar, And Vector

What is the norm of $a=\left \langle 7,2,1\right \rangle$ ?

Possible Answers:

$3\sqrt{10}$

$3\sqrt{6}$

$3\sqrt{7}$

$3\sqrt{3}$

$3\sqrt{5}$

Correct answer:

$3\sqrt{6}$

Explanation:

In order to find the norm of a vector, we must first find the sum of the squares of the vector's elements and take the square root of that sum. Given $a=\left \langle 7,2,1\right \rangle$ , then:

$\left \| a\right \|=\sqrt{(7)^{2}+(2)^{2}+(1)^{2}}$

$\left \| a\right \|=\sqrt{49+4+1}$

$\left \| a\right \|=\sqrt{49+5}$

$\left \| a\right \|=\sqrt{54}$

$\left \| a\right \|=\sqrt{9\times6}$

$\left \| a\right \|=3\sqrt{6}$

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Example Question #562 : Parametric, Polar, And Vector

What is the norm of $a=\left \langle -3,-4,7\right \rangle$ ?

Possible Answers:

$-5\sqrt{3}$

$5\sqrt{3}$

$6\sqrt{2}$

$\sqrt{74}$

$\sqrt{73}$

Correct answer:

$\sqrt{74}$

Explanation:

In order to find the norm of a vector, we must first find the sum of the squares of the vector's elements and take the square root of that sum. Given $a=\left \langle -3,-4,7\right \rangle$ , then:

$\left \| a\right \|=\sqrt{(-3)^{2}+(-4)^{2}+(7)^{2}}$

$\left \| a\right \|=\sqrt{9+16+49}$

$\left \| a\right \|=\sqrt{25+49}$

$\left \| a\right \|=\sqrt{74}$

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Example Question #563 : Parametric, Polar, And Vector

What is the norm of $a=\left \langle 0,1,-1\right \rangle$ ?

Possible Answers:

$3\sqrt{2}$

None of the above

$2\sqrt{2}$

$\sqrt{2}$

$5\sqrt{2}$

Correct answer:

$\sqrt{2}$

Explanation:

In order to find the norm of a vector, we must first find the sum of the squares of the vector's elements and take the square root of that sum. Given $a=\left \langle 0,1,-1\right \rangle$ , then:

$\left \| a\right \|=\sqrt{(0)^{2}+(1)^{2}+(-1)^{2}}$

$\left \| a\right \|=\sqrt{0+1+1}$

$\left \| a\right \|=\sqrt{2}$

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Example Question #564 : Parametric, Polar, And Vector

What is the cross product of $a=\left \langle 5,2,9\right \rangle$ and $b=\left \langle -1,2,4\right \rangle$ ?

Possible Answers:

$\left \langle -10,-29,-12 \right \rangle$

$\left \langle 10,-29,12 \right \rangle$

$\left \langle 10,29,12 \right \rangle$

$\left \langle -10,29,12 \right \rangle$

$\left \langle -10,-29,12 \right \rangle$

Correct answer:

$\left \langle -10,29,12 \right \rangle$

Explanation:

$a\times b=\begin{Bmatrix} i&j &k \\ a_{1}&a_{2} &a_{3} \\ b_{1}&b_{2} &b_{3} \end{Bmatrix}=\left \langle a_{2}b_{3}-a_{3}b_{2}, a_{1}b_{3}-a_{3}b_{1},a_{1}b_{2}-a_{2}b_{1} \right \rangle$ .

Given $a=\left \langle 5,2,9\right \rangle$ and $b=\left \langle -1,2,4\right \rangle$ , the cross product $a \times b$ is:

$\begin{Bmatrix} i& j&k \\ 5&2 &9 \\ -1&2 &4 \end{Bmatrix}$

$=\left \langle (2)(4)-(9)(2),(5)(4)-(9)(-1),(5)(2)-(2)(-1) \right \rangle$

$=\left \langle 8-18,20+9,10+2 \right \rangle$

$=\left \langle -10,29,12 \right \rangle$

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Calculus 2 : Parametric, Polar, and Vector

Study concepts, example questions & explanations for Calculus 2

All Calculus 2 Resources

Example Questions

Example Question #1074 : Calculus Ii

Example Question #1075 : Calculus Ii

Example Question #1076 : Calculus Ii

Example Question #214 : Vector

Example Question #215 : Vector

Example Question #216 : Vector

Example Question #561 : Parametric, Polar, And Vector

Example Question #562 : Parametric, Polar, And Vector

Example Question #563 : Parametric, Polar, And Vector

Example Question #564 : Parametric, Polar, And Vector

All Calculus 2 Resources

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