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Calculus 3 : Cross Product

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Example Questions

Example Question #81 : Cross Product

Find the cross product between the vectors $\left \langle 9,1,8\right \rangle$ and $\left \langle -1,0,5\right \rangle$

Possible Answers:

$\left \langle 7,-51,1\right \rangle$

$\left \langle 5,-50,1\right \rangle$

$\left \langle 5,53,1\right \rangle$

$\left \langle 5,-53,1\right \rangle$

Correct answer:

$\left \langle 5,-53,1\right \rangle$

Explanation:

To find the cross product between two vectors $a=\left \langle a_1,a_2,a_3\right \rangle$ and $b=\left \langle b_1,b_2,b_3\right \rangle$ , we take the determinant of the 3x3 matrix

$\begin{bmatrix} \hat{i}&\hat{j} &\hat{k} \\ a_1&a_2 &a_3 \\ b_1& b_2&b_3 \end{bmatrix}$ . $determinant=\hat{i}(a_2b_3-b_2a_3)-\hat{j}(a_1b_3-b_1a_3)+\hat{k}(a_1b_2-b_1a_2)$

Using the vectors from the problem statement, we get

$determinant=\hat{i}(5-0)-\hat{j}(45+8)+\hat{k}(0+1)=\left \langle 5,-53,1\right \rangle$

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Example Question #81 : Cross Product

Determine the dot product between the two vectors:

$\left \langle x, xy, z\right \rangle, \left \langle 3y, 3z, 5x\right \rangle$

Possible Answers:

6xy+5xz

$\left \langle 3xy, 3xyz, 5xz\right \rangle$

45x^3y^2z^2

3xy+3xyz+5xz

Correct answer:

3xy+3xyz+5xz

Explanation:

The dot product is given by the sum of the products of the corresponding components of each vector (for example, $\left \langle a,b\right \rangle\cdot \left \langle x,y\right \rangle= ax+by$ )

Our final answer is

3xy+3xyz+5xz

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Example Question #435 : Calculus 3

Find the cross product of the two vectors, written in standard form:

$4\hat{i}+7\hat{j}, \hat{i}+8\hat{j}+11\hat{k}$

Possible Answers:

$77\hat{i}+44\hat{j}+25\hat{k}$

$77\hat{i}-44\hat{j}+25\hat{k}$

$77\hat{i}+44\hat{j}+39\hat{k}$

$44\hat{i}-77\hat{j}+25\hat{k}$

Correct answer:

$77\hat{i}-44\hat{j}+25\hat{k}$

Explanation:

First, we must write the determinant in order to take the cross product of the two vectors:

$\begin{vmatrix} \hat{i}& \hat{j}&\hat{k} \\ 4&7 &0 \\ 1&8&11 \end{vmatrix}$

where i, j, and k are the unit vectors corresponding to the x, y, and z direction respectively.

Next, we take the cross product. One can do this by multiplying across from the top left to the lower right, and continuing downward, and then subtracting the terms multiplied from top right to the bottom left:

$77\hat{i}+32\hat{k}+0\hat{j}-(7\hat{k}+0\hat{i}+44\hat{j})=77\hat{i}-44\hat{j}+25\hat{k}$

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Example Question #433 : Calculus 3

Find the cross product of the following two vectors:

$\left \langle x,y,z\right \rangle, \left \langle 2, 0, 4\right \rangle$

Possible Answers:

$\left \langle 4y+4x, 2z, 2y\right \rangle$

$\left \langle 4y-4x, 2z, -2y\right \rangle$

$\left \langle -4y+4x, -2z, 2y\right \rangle$

$\left \langle 2y-2x, z, -y\right \rangle$

Correct answer:

$\left \langle 4y-4x, 2z, -2y\right \rangle$

Explanation:

To start, we write the determinant in order to take the cross product of the two vectors:

$\begin{vmatrix} \hat{i}& \hat{j}&\hat{k} \\ x&y &z \\ 2&0 &4 \end{vmatrix}$

where i, j, and k are the unit vectors corresponding to the x, y, and z direction respectively.

$4y\hat{i}+2z\hat{j}-(2y\hat{k}+4x\hat{i})=(4y-4x)\hat{i}+2z\hat{j}-2y\hat{k}=\left \langle 4y-4x, 2z, -2y\right \rangle$

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Example Question #191 : Vectors And Vector Operations

Find the cross product of the two vectors:

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

Possible Answers:

$\left \langle 16, 10, 14\right \rangle$

$\left \langle -14, 10, 14\right \rangle$

$\left \langle 16, -14, -6\right \rangle$

$\left \langle -16, 10, 14\right \rangle$

Correct answer:

$\left \langle -16, 10, 14\right \rangle$

Explanation:

To start, we write the determinant in order to take the cross product of the two vectors:

$\begin{vmatrix} \hat{i}& \hat{j}&\hat{k} \\ 4&5 &1 \\-2&1 &-3 \end{vmatrix}$

where i, j, and k are the unit vectors corresponding to the x, y, and z direction respectively.

$-15\hat{i}+4\hat{k}+-2\hat{j}-(-10\hat{k}+\hat{i}-12\hat{j})= -16\hat{i}+10\hat{j}+14\hat{k}=\left \langle -16, 10, 14\right \rangle$

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Example Question #82 : Cross Product

Find the cross product between the vectors $\left \langle 3,7,1\right \rangle$ and $\left \langle 0,4,5\right \rangle$

Possible Answers:

$\left \langle 31,-14,12\right \rangle$

$\left \langle 31,15,12\right \rangle$

$\left \langle 31,-15,12\right \rangle$

$\left \langle 25,-15,10\right \rangle$

Correct answer:

$\left \langle 31,-15,12\right \rangle$

Explanation:

To find the cross product between two vectors $a=\left \langle a_1,a_2,a_3\right \rangle$ and $b=\left \langle b_1,b_2,b_3\right \rangle$ , you take the determinant of the 3x3 matrix

$\begin{bmatrix} \hat{i}&\hat{j} &\hat{k} \\ a_1& a_2&a_3 \\ b_1&b_2 &b_3 \end{bmatrix}$ . $determinant=\hat{i}(a_2b_3-b_2a_3)-\hat{j}(a_1b_3-b_1a_3)+\hat{k}(a_1b_2-b_1a_2)$

Using the vectors from the problem statement, we get

$determinant=\hat{i}(35-4)-\hat{j}(15-0)+\hat{k}(12-0)=\left \langle 31,-15,12\right \rangle$

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Example Question #193 : Vectors And Vector Operations

Find the cross product between the vectors $\left \langle 0,1,-7\right \rangle$ and $\left \langle -9,3,0\right \rangle$

Possible Answers:

$\left \langle -21,63,9\right \rangle$

$\left \langle -21,-63,9\right \rangle$

$\left \langle -21,-63,10\right \rangle$

$\left \langle -19,-63,9\right \rangle$

Correct answer:

$\left \langle -21,-63,9\right \rangle$

Explanation:

To find the cross product between two vectors $a=\left \langle a_1,a_2,a_3\right \rangle$ and $b=\left \langle b_1,b_2,b_3\right \rangle$ , you take the determinant of the 3x3 matrix

$\begin{bmatrix} \hat{i}&\hat{j} &\hat{k} \\ a_1& a_2&a_3 \\ b_1&b_2 &b_3 \end{bmatrix}$ . $determinant=\hat{i}(a_2b_3-b_2a_3)-\hat{j}(a_1b_3-b_1a_3)+\hat{k}(a_1b_2-b_1a_2)$

Using the vectors from the problem statement, we get

$determinant=\hat{i}(0-21)-\hat{j}(0+63)+\hat{k}(0+9)=\left \langle -21,63,9\right \rangle$

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Example Question #192 : Vectors And Vector Operations

Find the cross product between the vectors $\left \langle 2,7,3\right \rangle$ and $\left \langle 0,5,3\right \rangle$

Possible Answers:

$\left \langle 6,6,10\right \rangle$

$\left \langle 9-6,11\right \rangle$

$\left \langle 3,-6,10\right \rangle$

$\left \langle 6,-6,10\right \rangle$

Correct answer:

$\left \langle 6,-6,10\right \rangle$

Explanation:

To find the cross product between two vectors $a=\left \langle a_1,a_2,a_3\right \rangle$ and $b=\left \langle b_1,b_2,b_3\right \rangle$ , you take the determinant of the 3x3 matrix

$\begin{bmatrix} \hat{i}&\hat{j} &\hat{k} \\ a_1& a_2&a_3 \\ b_1&b_2 &b_3 \end{bmatrix}$ . $determinant=\hat{i}(a_2b_3-b_2a_3)-\hat{j}(a_1b_3-b_1a_3)+\hat{k}(a_1b_2-b_1a_2)$

Using the vectors from the problem statement, we get

$determinant=\hat{i}(21-15)-\hat{j}(6-0)+\hat{k}(10-0)=\left \langle 6,-6,10\right \rangle$

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Example Question #193 : Vectors And Vector Operations

Find the cross product of the two vectors.

u=<2,6,7>

v=<-2,10,5>

Possible Answers:

<-40,-24,32>

<-2,6,5>

<8,12,16>

<2,10,7>

Correct answer:

<-40,-24,32>

Explanation:

To find the cross product we solve for the determinant of the matrix

$\begin{vmatrix} i &j &k \\ 2&6 &7 \\ -2& 10& 5\end{vmatrix}$

$=det(\begin{vmatrix} 6&7 \\ 10& 5\end{vmatrix})i-det(\begin{vmatrix} 2&7 \\ -2& 5\end{vmatrix})j+det(\begin{vmatrix} 2&6 \\ -2& 10\end{vmatrix})k$

=[6(5)-7(10)]i-[2(5)-7(-2)]j+[2(10)-6(-2)]k

=[30-70]i-[10+14]j+[20+12]k

=-40i-24j+32k

As such, the cross product is

<-40,-24,32>

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Example Question #194 : Vectors And Vector Operations

Find the cross product of the two vectors.

u=<6,-3,-1>

v=<4,1,-1>

Possible Answers:

<6,1,-1>

<0,5,3>

<2,10,18>

<4,-3,-1>

Correct answer:

<2,10,18>

Explanation:

To find the cross product we solve for the determinant of the matrix

$\begin{vmatrix} i &j &k \\ 6&-3 &\-1 \\ 4& 1& -1\end{vmatrix}$

$=det(\begin{vmatrix} -3&1 \\ 1& -1\end{vmatrix})i-det(\begin{vmatrix} 6&1 \\ 4& -1\end{vmatrix})j+det(\begin{vmatrix} 6&-3 \\ 4& 1\end{vmatrix})k$

=[-3(-1)-1(1)]i-[6(-1)-4(1)]j+[6(1)-4(-3)]k

=[3-1]i-[-6-4]j+[6+12]k

=2i+10j+18k

As such, the cross product is

<2,10,18>

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Calculus 3 : Cross Product

Study concepts, example questions & explanations for Calculus 3

All Calculus 3 Resources

Example Questions

Example Question #81 : Cross Product

Example Question #81 : Cross Product

Example Question #435 : Calculus 3

Example Question #433 : Calculus 3

Example Question #191 : Vectors And Vector Operations

Example Question #82 : Cross Product

Example Question #193 : Vectors And Vector Operations

Example Question #192 : Vectors And Vector Operations

Example Question #193 : Vectors And Vector Operations

Example Question #194 : Vectors And Vector Operations

All Calculus 3 Resources

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