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Calculus 2 : Vector

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

Example Questions

Example Question #91 : Vector Form

What is the vector form of -6i+j+k ?

Possible Answers:

$\left \langle -6,1,1\right \rangle$

$\left \langle -6,1,-1\right \rangle$

$\left \langle 6,1,-1\right \rangle$

$\left \langle 6,-1,1\right \rangle$

$\left \langle 6,1,1\right \rangle$

Correct answer:

$\left \langle -6,1,1\right \rangle$

Explanation:

In order to derive the vector form, we must map the , , -coordinates to their corresponding , , and coefficients.

That is, given $a_{1}i+a_{2}j+a_{3}k$ , the vector form is $a=\left \langle a_{1},a_{2},a_{3}\right \rangle$ .

So for -6i+j+k , we can derive the vector form $\left \langle -6,1,1\right \rangle$ .

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Example Question #91 : Vector Form

What is the vector form of 3i-k ?

Possible Answers:

$\left \langle 3,0,-1\right \rangle$

$\left \langle 3,-1,0\right \rangle$

$\left \langle -3,0,-1\right \rangle$

$\left \langle 3,0,1\right \rangle$

$\left \langle -3,0,1\right \rangle$

Correct answer:

$\left \langle 3,0,-1\right \rangle$

Explanation:

In order to derive the vector form, we must map the , , -coordinates to their corresponding , , and coefficients.

That is, given $a_{1}i+a_{2}j+a_{3}k$ , the vector form is $a=\left \langle a_{1},a_{2},a_{3}\right \rangle$ .

So for 3i-k , we can derive the vector form $\left \langle 3,0,-1\right \rangle$ .

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Example Question #113 : Linear Algebra

Given points (4,2,-2) and (7,1,0) , what is the vector form of the distance between the points?

Possible Answers:

$\left \langle 3,1,2\right \rangle$

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

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

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

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

Correct answer:

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

Explanation:

In order to derive the vector form of the distance between two points, we must find the difference between the , , and elements of the points.

That is, for any point $a=\left \langle a_{1},a_{2},a_{3}\right \rangle$ and $b=\left \langle b_1,b_2,b_3\right \rangle$ , the distance is the vector $v=\left \langle b_1-a_1,b_2-a_2,b_3-a_3\right \rangle$ .

Subbing in our original points (4,2,-2) and (7,1,0) , we get:

$v=\left \langle 7-4,1-2,0-(-2)\right \rangle$

$v=\left \langle 3,-1,2\right \rangle$

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Example Question #91 : Vector Form

Given points (2,7,-6) and (1,2,3) , what is the vector form of the distance between the points?

Possible Answers:

$\left \langle 1,-5,-9\right \rangle$

$\left \langle -1,5,-9\right \rangle$

$\left \langle -1,-5,-9\right \rangle$

$\left \langle -1,-5,9\right \rangle$

$\left \langle 1,5,9\right \rangle$

Correct answer:

$\left \langle -1,-5,9\right \rangle$

Explanation:

In order to derive the vector form of the distance between two points, we must find the difference between the , , and elements of the points.

Subbing in our original points (2,7,-6) and (1,2,3) , we get:

$v=\left \langle 1-2,2-7,3-(-6)\right \rangle$

$v=\left \langle -1,-5,9\right \rangle$

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Example Question #91 : Vectors

What is the vector form of -i+2j+10k ?

Possible Answers:

$\left \langle 1,2,-10\right \rangle$

$\left \langle 1,-2,10\right \rangle$

$\left \langle 1,2,10\right \rangle$

$\left \langle -1,2,10\right \rangle$

$\left \langle 1,-2,-10\right \rangle$

Correct answer:

$\left \langle -1,2,10\right \rangle$

Explanation:

In order to derive the vector form, we must map the , , -coordinates to their corresponding , , and coefficients.

That is, given $a_{1}i+a_{2}j+a_{3}k$ , the vector form is $a=\left \langle a_{1},a_{2},a_{3}\right \rangle$ .

So for -i+2j+10k , we can derive the vector form $\left \langle -1,2,10\right \rangle$ .

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Example Question #92 : Vector Form

What is the vector form of i+k ?

Possible Answers:

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

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

$\left \langle -1,0,1\right \rangle$

$\left \langle 1,0,-1\right \rangle$

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

Correct answer:

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

Explanation:

In order to derive the vector form, we must map the , , -coordinates to their corresponding , , and coefficients.

That is, given $a_{1}i+a_{2}j+a_{3}k$ , the vector form is $a=\left \langle a_{1},a_{2},a_{3}\right \rangle$ .

So for i+k , we can derive the vector form $\left \langle 1,0,1\right \rangle$ .

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Example Question #11 : Vectors & Spaces

What is the vector form of j+8k ?

Possible Answers:

$\left \langle 1,0,8\right \rangle$

None of the above

$\left \langle 1,8,0\right \rangle$

$\left \langle 0,8,1\right \rangle$

$\left \langle 0,1,8\right \rangle$

Correct answer:

$\left \langle 0,1,8\right \rangle$

Explanation:

Given j+8k , we need to map the , , and coefficients back to their corresponding , , and -coordinates.

Thus the vector form of j+8k is $\left \langle 0,1,8\right \rangle$ .

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Example Question #11 : Vectors

Express 4i-9j in vector form.

Possible Answers:

$\left \langle 4,-9,0\right \rangle$

$\left \langle 4,0,-9\right \rangle$

$\left \langle 0,4,-9\right \rangle$

$\left \langle 4,9,0\right \rangle$

$\left \langle 4,-9\right \rangle$

Correct answer:

$\left \langle 4,-9,0\right \rangle$

Explanation:

In order to express 4i-9j in vector form, we must use the coefficients of i, j, and to represent the -, -, and -coordinates of the vector.

Therefore, its vector form is

$\left \langle 4,-9,0\right \rangle$ .

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Example Question #951 : Calculus Ii

What is the arclength, from x = 0 to $x=\frac{\pi}{3}$ , of the curve:

$y = ln \left | cos x\right |$

Hint:

$\int (sec (x)) dx= ln \left | sec (x) +tan(x)\right | + C$

Possible Answers:

$\sqrt{2} + 1$

$ln (\sqrt{3} + {2})$

$ln \left(\sqrt{2} + \frac{1}{2}\right)$

$ln (\sqrt{2} + \sqrt3)$

$\sqrt{3} - \sqrt2$

Correct answer:

$ln (\sqrt{3} + {2})$

Explanation:

Arclength is given by the formula:

$Arclength = \int_{a}^{b} \sqrt{1 + \left(\frac{dy}{dx}}\right)^2 dx$

We should find dy/dx first, which we find to be:

$\frac{\mathrm{d} }{\mathrm{d} x}(ln(cos(x)) = \frac{1}{cos(x)}\cdot (-sin(x)) = -tan(x)$

Now let's proceed with the integral:

$\int_{0}^{\frac{\pi}{3}} \sqrt{1 + (-tan x)^2}dx = \int_{0}^{\frac{\pi}{3}} \sqrt{(sec^2x)}dx = \int_{0}^{\frac{\pi}{3}} sec(x)dx$

(here we apply the integration described in the hint)

$= \left[ln \left | tan(x) + sec(x)\right |\bigg]_{0}^{\frac{\pi}{3}} = ln (\sqrt{3} + {2})$

which is obtained by evaluating at both boundaries.

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Example Question #2 : Graphing Vectors

Find the area of the polar equation:

$r = \sqrt{cos(\theta )}$

Possible Answers:

$\frac{1}{2}$

$\pi$

Correct answer:

Explanation:

When you plot the graph of $r = \sqrt{cos(\theta )}$ , the bounds are between $\theta = -\frac{\pi }{2}$ and $\theta = \frac{\pi }{2}$ .

Use the area formula for polar equations:

$Area = \int_{\theta_{1} }^{\theta_{2}} \frac{1}{2}r^2 d\theta$

And so we find the area to be:

$\frac{1}{2}\int_{-\frac{\pi }{2}}^{\frac{\pi }{2}} (\sqrt{cos( \theta)})^2d\theta = \frac{1}{2}\int_{-\frac{\pi }{2}}^{\frac{\pi }{2}} cos (\theta)d\theta = \frac{1}{2}[sin \theta ]_{-\frac{\pi }{2}}^{\frac{\pi }{2}}$

$= \frac{1}{2}(1+1) = 1$

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Calculus 2 : Vector

Study concepts, example questions & explanations for Calculus 2

All Calculus 2 Resources

Example Questions

Example Question #91 : Vector Form

Example Question #91 : Vector Form

Example Question #113 : Linear Algebra

Example Question #91 : Vector Form

Example Question #91 : Vectors

Example Question #92 : Vector Form

Example Question #11 : Vectors & Spaces

Example Question #11 : Vectors

Example Question #951 : Calculus Ii

Example Question #2 : Graphing Vectors

All Calculus 2 Resources

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