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Calculus 3 : Cylindrical Coordinates

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Example Questions

Example Question #211 : Cylindrical Coordinates

$\begin{align*}&\text{A point in space is located, in Cartesian coordinates, at } (-73,103,-74).\\&\text{What is the position of this point in cylindrical coordinates?}\end{align*}$

Possible Answers:

$(126.25,-54.67^{\circ},-74)$

$(30,-54.67^{\circ},-74)$

$(126.25,125.33^{\circ},-74)$

$(30,125.33^{\circ},-74)$

Correct answer:

$(126.25,125.33^{\circ},-74)$

Explanation:

$\begin{align*}&\text{When converting Cartesian coordinates of the form} (x,y,z)\\&\text{to cylindrical coordinates of the form }(r,\theta,z)\text{, the first and third terms}\\& \text{are the most straightforward: }\\& r=\sqrt{x^2+y^2}\\&z=z\\&\text{However, it is prudent to be carful when calculating }\theta.\\&\text{The formula for it is as follows:}\\& \theta=arctan(\frac{y}{x})\\&\text{Remember, it is important to be mindful of the signs of }x\text{ and }y\text{, bearing in mind}\\& \text{which quadrant the point lies in; this determines the value of }\theta.\\& \text{Negative }y\text{ values lead to a negative }\theta\text{; negative }x\\&\text{values lead to }|\theta|>90^{\circ}\\&\\&\text{For our coordinates: }(-73,103,-74)\\&r=\sqrt{(-73)^2+(103)^2}=126.25\\&\theta=arctan(\frac{103}{-73})=125.33^{\circ}\\&z=-74\end{align*}$

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Example Question #212 : Cylindrical Coordinates

$\begin{align*}&\text{A point in space is located, in Cartesian coordinates, at } (95,-77,129).\\&\text{What is the position of this point in cylindrical coordinates?}\end{align*}$

Possible Answers:

$(18,140.97^{\circ},129)$

$(122.29,140.97^{\circ},129)$

$(18,-39.03^{\circ},129)$

$(122.29,-39.03^{\circ},129)$

Correct answer:

$(122.29,-39.03^{\circ},129)$

Explanation:

$\begin{align*}&\text{When converting Cartesian coordinates of the form} (x,y,z)\\&\text{to cylindrical coordinates of the form }(r,\theta,z)\text{, the first and third terms}\\& \text{are the most straightforward: }\\& r=\sqrt{x^2+y^2}\\&z=z\\&\text{However, it is prudent to be carful when calculating }\theta.\\&\text{The formula for it is as follows:}\\& \theta=arctan(\frac{y}{x})\\&\text{Remember, it is important to be mindful of the signs of }x\text{ and }y\text{, bearing in mind}\\& \text{which quadrant the point lies in; this determines the value of }\theta.\\& \text{Negative }y\text{ values lead to a negative }\theta\text{; negative }x\\&\text{values lead to }|\theta|>90^{\circ}\\&\\&\text{For our coordinates: }(95,-77,129)\\&r=\sqrt{(95)^2+(-77)^2}=122.29\\&\theta=arctan(\frac{-77}{95})=-39.03^{\circ}\\&z=129\end{align*}$

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Example Question #213 : Cylindrical Coordinates

$\begin{align*}&\text{A point in space is located, in cylindrical coordinates, at } (53,-90^{\circ},-91).\\&\text{What is the position of this point in Cartesian coordinates?}\end{align*}$

Possible Answers:

(0,-53,-91)

(-53,0,-91)

(-23.75,-47.38,-91)

(-47.38,-23.75,-91)

Correct answer:

(0,-53,-91)

Explanation:

$\begin{align*}&\text{If asked to convert cylindrical coordinates of the form} (r,\theta,z)\\&\text{to Cartesian coordinates of the form }(x,y,z)\text{, it is necessary to relate } x\text{ and }y\\& \text{to the radius, }r\text{, and the angle, }\theta.\text{ The relationships are as follows:}\\&x=rcos(\theta)\\&y=rsin(\theta)\\&\text{Finding }z\text{ is much simpler; it does not change between}\\& \text{Cartesian and cylindrical coordinates:}\\&z=z\\&\text{However, care should be taken when finding }x\text{ and }y\text{; if using a calculator, it is}\\& \text{imperative that the correct units (degrees or radians) are specified}\\& \text{for the input!}\\&\text{For our coordinates}\\&x=53cos(-90^{\circ})=0\\&y=53sin(-90^{\circ})=-53\\&z=-91\end{align*}$

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Example Question #214 : Cylindrical Coordinates

$\begin{align*}&\text{A point in space is located, in cylindrical coordinates, at } (93,-54^{\circ},-8).\\&\text{What is the position of this point in Cartesian coordinates?}\end{align*}$

Possible Answers:

(54.66,-75.24,-8)

(51.97,-77.13,-8)

(-77.13,51.97,-8)

(-75.24,54.66,-8)

Correct answer:

(54.66,-75.24,-8)

Explanation:

$\begin{align*}&\text{If asked to convert cylindrical coordinates of the form} (r,\theta,z)\\&\text{to Cartesian coordinates of the form }(x,y,z)\text{, it is necessary to relate } x\text{ and }y\\& \text{to the radius, }r\text{, and the angle, }\theta.\text{ The relationships are as follows:}\\&x=rcos(\theta)\\&y=rsin(\theta)\\&\text{Finding }z\text{ is much simpler; it does not change between}\\& \text{Cartesian and cylindrical coordinates:}\\&z=z\\&\text{However, care should be taken when finding }x\text{ and }y\text{; if using a calculator, it is}\\& \text{imperative that the correct units (degrees or radians) are specified}\\& \text{for the input!}\\&\text{For our coordinates}\\&x=93cos(-54^{\circ})=54.66\\&y=93sin(-54^{\circ})=-75.24\\&z=-8\end{align*}$

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Example Question #215 : Cylindrical Coordinates

$\begin{align*}&\text{A point in space is located, in cylindrical coordinates, at } (125,18^{\circ},26).\\&\text{What is the position of this point in Cartesian coordinates?}\end{align*}$

Possible Answers:

(82.54,-93.87,26)

(118.88,38.63,26)

(38.63,118.88,26)

(-93.87,82.54,26)

Correct answer:

(118.88,38.63,26)

Explanation:

$\begin{align*}&\text{If asked to convert cylindrical coordinates of the form} (r,\theta,z)\\&\text{to Cartesian coordinates of the form }(x,y,z)\text{, it is necessary to relate } x\text{ and }y\\& \text{to the radius, }r\text{, and the angle, }\theta.\text{ The relationships are as follows:}\\&x=rcos(\theta)\\&y=rsin(\theta)\\&\text{Finding }z\text{ is much simpler; it does not change between}\\& \text{Cartesian and cylindrical coordinates:}\\&z=z\\&\text{However, care should be taken when finding }x\text{ and }y\text{; if using a calculator, it is}\\& \text{imperative that the correct units (degrees or radians) are specified}\\& \text{for the input!}\\&\text{For our coordinates}\\&x=125cos(18^{\circ})=118.88\\&y=125sin(18^{\circ})=38.63\\&z=26\end{align*}$

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Example Question #216 : Cylindrical Coordinates

$\begin{align*}&\text{A point in space is located, in cylindrical coordinates, at } (138,93^{\circ},-64).\\&\text{What is the position of this point in Cartesian coordinates?}\end{align*}$

Possible Answers:

(43.81,-130.86,-64)

(-7.22,137.81,-64)

(137.81,-7.22,-64)

(-130.86,43.81,-64)

Correct answer:

(-7.22,137.81,-64)

Explanation:

$\begin{align*}&\text{If asked to convert cylindrical coordinates of the form} (r,\theta,z)\\&\text{to Cartesian coordinates of the form }(x,y,z)\text{, it is necessary to relate } x\text{ and }y\\& \text{to the radius, }r\text{, and the angle, }\theta.\text{ The relationships are as follows:}\\&x=rcos(\theta)\\&y=rsin(\theta)\\&\text{Finding }z\text{ is much simpler; it does not change between}\\& \text{Cartesian and cylindrical coordinates:}\\&z=z\\&\text{However, care should be taken when finding }x\text{ and }y\text{; if using a calculator, it is}\\& \text{imperative that the correct units (degrees or radians) are specified}\\& \text{for the input!}\\&\text{For our coordinates}\\&x=138cos(93^{\circ})=-7.22\\&y=138sin(93^{\circ})=137.81\\&z=-64\end{align*}$

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Example Question #217 : Cylindrical Coordinates

$\begin{align*}&\text{A point in space is located, in cylindrical coordinates, at } (114,24^{\circ},-36).\\&\text{What is the position of this point in Cartesian coordinates?}\end{align*}$

Possible Answers:

(46.37,104.14,-36)

(48.36,-103.24,-36)

(104.14,46.37,-36)

(-103.24,48.36,-36)

Correct answer:

(104.14,46.37,-36)

Explanation:

$\begin{align*}&\text{If asked to convert cylindrical coordinates of the form} (r,\theta,z)\\&\text{to Cartesian coordinates of the form }(x,y,z)\text{, it is necessary to relate } x\text{ and }y\\& \text{to the radius, }r\text{, and the angle, }\theta.\text{ The relationships are as follows:}\\&x=rcos(\theta)\\&y=rsin(\theta)\\&\text{Finding }z\text{ is much simpler; it does not change between}\\& \text{Cartesian and cylindrical coordinates:}\\&z=z\\&\text{However, care should be taken when finding }x\text{ and }y\text{; if using a calculator, it is}\\& \text{imperative that the correct units (degrees or radians) are specified}\\& \text{for the input!}\\&\text{For our coordinates}\\&x=114cos(24^{\circ})=104.14\\&y=114sin(24^{\circ})=46.37\\&z=-36\end{align*}$

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Example Question #218 : Cylindrical Coordinates

$\begin{align*}&\text{A point in space is located, in cylindrical coordinates, at } (12,11^{\circ},-134).\\&\text{What is the position of this point in Cartesian coordinates?}\end{align*}$

Possible Answers:

(11.78,2.29,-134)

(0.05,-12,-134)

(-12,0.05,-134)

(2.29,11.78,-134)

Correct answer:

(11.78,2.29,-134)

Explanation:

$\begin{align*}&\text{If asked to convert cylindrical coordinates of the form} (r,\theta,z)\\&\text{to Cartesian coordinates of the form }(x,y,z)\text{, it is necessary to relate } x\text{ and }y\\& \text{to the radius, }r\text{, and the angle, }\theta.\text{ The relationships are as follows:}\\&x=rcos(\theta)\\&y=rsin(\theta)\\&\text{Finding }z\text{ is much simpler; it does not change between}\\& \text{Cartesian and cylindrical coordinates:}\\&z=z\\&\text{However, care should be taken when finding }x\text{ and }y\text{; if using a calculator, it is}\\& \text{imperative that the correct units (degrees or radians) are specified}\\& \text{for the input!}\\&\text{For our coordinates}\\&x=12cos(11^{\circ})=11.78\\&y=12sin(11^{\circ})=2.29\\&z=-134\end{align*}$

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Example Question #219 : Cylindrical Coordinates

$\begin{align*}&\text{A point in space is located, in cylindrical coordinates, at } (117,-134^{\circ},131).\\&\text{What is the position of this point in Cartesian coordinates?}\end{align*}$

Possible Answers:

(-54.27,-103.65,131)

(-84.16,-81.28,131)

(-103.65,-54.27,131)

(-81.28,-84.16,131)

Correct answer:

(-81.28,-84.16,131)

Explanation:

$\begin{align*}&\text{If asked to convert cylindrical coordinates of the form} (r,\theta,z)\\&\text{to Cartesian coordinates of the form }(x,y,z)\text{, it is necessary to relate } x\text{ and }y\\& \text{to the radius, }r\text{, and the angle, }\theta.\text{ The relationships are as follows:}\\&x=rcos(\theta)\\&y=rsin(\theta)\\&\text{Finding }z\text{ is much simpler; it does not change between}\\& \text{Cartesian and cylindrical coordinates:}\\&z=z\\&\text{However, care should be taken when finding }x\text{ and }y\text{; if using a calculator, it is}\\& \text{imperative that the correct units (degrees or radians) are specified}\\& \text{for the input!}\\&\text{For our coordinates}\\&x=117cos(-134^{\circ})=-81.28\\&y=117sin(-134^{\circ})=-84.16\\&z=131\end{align*}$

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Example Question #220 : Cylindrical Coordinates

$\begin{align*}&\text{A point in space is located, in cylindrical coordinates, at } (86,-176^{\circ},-9).\\&\text{What is the position of this point in Cartesian coordinates?}\end{align*}$

Possible Answers:

(-85.79,-6,-9)

(-6.08,85.78,-9)

(85.78,-6.08,-9)

(-6,-85.79,-9)

Correct answer:

(-85.79,-6,-9)

Explanation:

$\begin{align*}&\text{If asked to convert cylindrical coordinates of the form} (r,\theta,z)\\&\text{to Cartesian coordinates of the form }(x,y,z)\text{, it is necessary to relate } x\text{ and }y\\& \text{to the radius, }r\text{, and the angle, }\theta.\text{ The relationships are as follows:}\\&x=rcos(\theta)\\&y=rsin(\theta)\\&\text{Finding }z\text{ is much simpler; it does not change between}\\& \text{Cartesian and cylindrical coordinates:}\\&z=z\\&\text{However, care should be taken when finding }x\text{ and }y\text{; if using a calculator, it is}\\& \text{imperative that the correct units (degrees or radians) are specified}\\& \text{for the input!}\\&\text{For our coordinates}\\&x=86cos(-176^{\circ})=-85.79\\&y=86sin(-176^{\circ})=-6\\&z=-9\end{align*}$

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Calculus 3 : Cylindrical Coordinates

Study concepts, example questions & explanations for Calculus 3

All Calculus 3 Resources

Example Questions

Example Question #211 : Cylindrical Coordinates

Example Question #212 : Cylindrical Coordinates

Example Question #213 : Cylindrical Coordinates

Example Question #214 : Cylindrical Coordinates

Example Question #215 : Cylindrical Coordinates

Example Question #216 : Cylindrical Coordinates

Example Question #217 : Cylindrical Coordinates

Example Question #218 : Cylindrical Coordinates

Example Question #219 : Cylindrical Coordinates

Example Question #220 : Cylindrical Coordinates

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