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Calculus 1 : How to find rate of change

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Example Questions

Example Question #751 : Rate

A cube is growing in size. What is the ratio of the rate of growth of the cube's surface area to the rate of growth of its diagonal when its sides have length $4\sqrt{33}$ ?

Possible Answers:

$48\sqrt{11}$

$132\sqrt{3}$

$44\sqrt{3}$

$44\sqrt{11}$

$48\sqrt{3}$

Correct answer:

$48\sqrt{11}$

Explanation:

Begin by writing the equations for a cube's dimensions. Namely its surface area and diagonal in terms of the length of its sides:

A=6s^2

$d=s\sqrt{3}$

The rates of change of these can be found by taking the derivative of each side of the equations with respect to time:

$\frac{dA}{dt}=12s\frac{ds}{dt}$

$\frac{dd}{dt}=\sqrt{3}\frac{ds}{dt}$

Now, knowing the length of the sides, simply divide to find the ratio between the rate of change of the surface area and diagonal:

$12s\frac{ds}{dt}=(\phi)\sqrt{3}\frac{ds}{dt}$

$\phi=4s\sqrt{3}$

$\phi =4(4\sqrt{33})\sqrt{3}=48\sqrt{11}$

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Example Question #761 : Rate

A cube is growing in size. What is the ratio of the rate of growth of the cube's surface area to the rate of growth of its diagonal when its sides have length $11\sqrt{57}$ ?

Possible Answers:

$44\sqrt{19}$

$396\sqrt{57}$

$132\sqrt{19}$

$44\sqrt{57}$

$396\sqrt{19}$

Correct answer:

$132\sqrt{19}$

Explanation:

Begin by writing the equations for a cube's dimensions. Namely its surface area and diagonal in terms of the length of its sides:

A=6s^2

$d=s\sqrt{3}$

The rates of change of these can be found by taking the derivative of each side of the equations with respect to time:

$\frac{dA}{dt}=12s\frac{ds}{dt}$

$\frac{dd}{dt}=\sqrt{3}\frac{ds}{dt}$

Now, knowing the length of the sides, simply divide to find the ratio between the rate of change of the surface area and diagonal:

$12s\frac{ds}{dt}=(\phi)\sqrt{3}\frac{ds}{dt}$

$\phi=4s\sqrt{3}$

$\phi =4(11\sqrt{57})\sqrt{3}=132\sqrt{19}$

Report an Error

Example Question #762 : Rate

A cube is diminishing in size. What is the ratio of the rate of loss of the cube's surface area to the rate of loss of its diagonal when its sides have length $\frac{\sqrt{3}}{54}$ ?

Possible Answers:

$\frac{1}{3}$

$\frac{8}{9}$

$\frac{4}{9}$

$\frac{4}{3}$

$\frac{2}{9}$

Correct answer:

$\frac{2}{9}$

Explanation:

Begin by writing the equations for a cube's dimensions. Namely its surface area and diagonal in terms of the length of its sides:

A=6s^2

$d=s\sqrt{3}$

The rates of change of these can be found by taking the derivative of each side of the equations with respect to time:

$\frac{dA}{dt}=12s\frac{ds}{dt}$

$\frac{dd}{dt}=\sqrt{3}\frac{ds}{dt}$

Now, knowing the length of the sides, simply divide to find the ratio between the rate of change of the surface area and diagonal:

$12s\frac{ds}{dt}=(\phi)\sqrt{3}\frac{ds}{dt}$

$\phi=4s\sqrt{3}$

$\phi =4(\frac{\sqrt{3}}{54})\sqrt{3}=\frac{2}{9}$

Report an Error

Example Question #763 : Rate

A cube is diminishing in size. What is the ratio of the rate of loss of the cube's surface area to the rate of loss of its diagonal when its sides have length $\frac{\sqrt{6}}{16}$ ?

Possible Answers:

$2\sqrt{3}$

$\frac{3\sqrt{3}}{4}$

$\frac{3\sqrt{2}}{2}$

$4\sqrt{3}$

$\frac{3\sqrt{2}}{4}$

Correct answer:

$\frac{3\sqrt{2}}{4}$

Explanation:

Begin by writing the equations for a cube's dimensions. Namely its surface area and diagonal in terms of the length of its sides:

A=6s^2

$d=s\sqrt{3}$

The rates of change of these can be found by taking the derivative of each side of the equations with respect to time:

$\frac{dA}{dt}=12s\frac{ds}{dt}$

$\frac{dd}{dt}=\sqrt{3}\frac{ds}{dt}$

Now, knowing the length of the sides, simply divide to find the ratio between the rate of change of the surface area and diagonal:

$12s\frac{ds}{dt}=(\phi)\sqrt{3}\frac{ds}{dt}$

$\phi=4s\sqrt{3}$

$\phi =4(\frac{\sqrt{6}}{16})\sqrt{3}=\frac{3\sqrt{2}}{4}$

Report an Error

Example Question #671 : Rate Of Change

A cube is diminishing in size. What is the ratio of the rate of loss of the cube's surface area to the rate of loss of its diagonal when its sides have length $\frac{\sqrt{21}}{8}$ ?

Possible Answers:

$\frac{7\sqrt{3}}{8}$

$\frac{7\sqrt{3}}{4}$

$\frac{3\sqrt{7}}{2}$

$\frac{7\sqrt{3}}{2}$

$\frac{3\sqrt{7}}{4}$

Correct answer:

$\frac{3\sqrt{7}}{2}$

Explanation:

Begin by writing the equations for a cube's dimensions. Namely its surface area and diagonal in terms of the length of its sides:

A=6s^2

$d=s\sqrt{3}$

The rates of change of these can be found by taking the derivative of each side of the equations with respect to time:

$\frac{dA}{dt}=12s\frac{ds}{dt}$

$\frac{dd}{dt}=\sqrt{3}\frac{ds}{dt}$

Now, knowing the length of the sides, simply divide to find the ratio between the rate of change of the surface area and diagonal:

$12s\frac{ds}{dt}=(\phi)\sqrt{3}\frac{ds}{dt}$

$\phi=4s\sqrt{3}$

$\phi =4(\frac{\sqrt{21}}{8})\sqrt{3}=\frac{3\sqrt{7}}{2}$

Report an Error

Example Question #765 : Rate

A cube is diminishing in size. What is the ratio of the rate of loss of the cube's surface area to the rate of loss of its diagonal when its sides have length $\frac{\sqrt{6}}{48}$ ?

Possible Answers:

$\frac{\sqrt{2}}{4}$

$\frac{3\sqrt{2}}{8}$

$\frac{\sqrt{2}}{2}$

$\frac{3\sqrt{2}}{4}$

$\frac{\sqrt{2}}{8}$

Correct answer:

$\frac{\sqrt{2}}{4}$

Explanation:

Begin by writing the equations for a cube's dimensions. Namely its surface area and diagonal in terms of the length of its sides:

A=6s^2

$d=s\sqrt{3}$

The rates of change of these can be found by taking the derivative of each side of the equations with respect to time:

$\frac{dA}{dt}=12s\frac{ds}{dt}$

$\frac{dd}{dt}=\sqrt{3}\frac{ds}{dt}$

Now, knowing the length of the sides, simply divide to find the ratio between the rate of change of the surface area and diagonal:

$12s\frac{ds}{dt}=(\phi)\sqrt{3}\frac{ds}{dt}$

$\phi=4s\sqrt{3}$

$\phi =4(\frac{\sqrt{6}}{48})\sqrt{3}=\frac{\sqrt{2}}{4}$

Report an Error

Example Question #671 : How To Find Rate Of Change

A cube is diminishing in size. What is the ratio of the rate of loss of the cube's surface area to the rate of loss of its diagonal when its sides have length $\frac{2}{19}$ ?

Possible Answers:

$\frac{6\sqrt{3}}{19}$

$\frac{16\sqrt{3}}{19}$

$\frac{4\sqrt{3}}{19}$

$\frac{2\sqrt{3}}{19}$

$\frac{8\sqrt{3}}{19}$

Correct answer:

$\frac{8\sqrt{3}}{19}$

Explanation:

Begin by writing the equations for a cube's dimensions. Namely its surface area and diagonal in terms of the length of its sides:

A=6s^2

$d=s\sqrt{3}$

The rates of change of these can be found by taking the derivative of each side of the equations with respect to time:

$\frac{dA}{dt}=12s\frac{ds}{dt}$

$\frac{dd}{dt}=\sqrt{3}\frac{ds}{dt}$

Now, knowing the length of the sides, simply divide to find the ratio between the rate of change of the surface area and diagonal:

$12s\frac{ds}{dt}=(\phi)\sqrt{3}\frac{ds}{dt}$

$\phi=4s\sqrt{3}$

$\phi =4(\frac{2}{19})\sqrt{3}=\frac{8\sqrt{3}}{19}$

Report an Error

Example Question #672 : How To Find Rate Of Change

A cube is diminishing in size. What is the ratio of the rate of loss of the cube's surface area to the rate of loss of its diagonal when its sides have length $\frac{\sqrt{7}}{7}$ ?

Possible Answers:

$\frac{4\sqrt{21}}{7}$

$\frac{2\sqrt{3}}{7}$

$4\sqrt{3}$

$\frac{4\sqrt{3}}{7}$

$2\sqrt{3}$

Correct answer:

$\frac{4\sqrt{21}}{7}$

Explanation:

Begin by writing the equations for a cube's dimensions. Namely its surface area and diagonal in terms of the length of its sides:

A=6s^2

$d=s\sqrt{3}$

The rates of change of these can be found by taking the derivative of each side of the equations with respect to time:

$\frac{dA}{dt}=12s\frac{ds}{dt}$

$\frac{dd}{dt}=\sqrt{3}\frac{ds}{dt}$

Now, knowing the length of the sides, simply divide to find the ratio between the rate of change of the surface area and diagonal:

$12s\frac{ds}{dt}=(\phi)\sqrt{3}\frac{ds}{dt}$

$\phi=4s\sqrt{3}$

$\phi =4(\frac{\sqrt{7}}{7})\sqrt{3}=\frac{4\sqrt{21}}{7}$

Report an Error

Example Question #673 : How To Find Rate Of Change

A cube is growing in size. What is the ratio of the rate of growth of the cube's surface area to the rate of growth of its sides when its sides have length 51?

Possible Answers:

816

612

306

1224

204

Correct answer:

612

Explanation:

Begin by writing the equations for a cube's dimensions. Namely its surface area in terms of the length of its sides:

A=6s^2

The rates of change of the area can be found by taking the derivative of each side of the equation with respect to time:

$\frac{dA}{dt}=12s\frac{ds}{dt}$

Now, knowing the length of the sides, simply divide to find the ratio between the rate of change of the surface area and diagonal:

$12s\frac{ds}{dt}=(\phi)\frac{ds}{dt}$

$\phi=12s$

$\phi =12(51)=612$

Report an Error

Example Question #674 : How To Find Rate Of Change

A cube is growing in size. What is the ratio of the rate of growth of the cube's surface area to the rate of growth of its sides when its sides have length 15?

Possible Answers:

240

180

480

120

360

Correct answer:

180

Explanation:

Begin by writing the equations for a cube's dimensions. Namely its surface area in terms of the length of its sides:

A=6s^2

The rates of change of the area can be found by taking the derivative of each side of the equation with respect to time:

$\frac{dA}{dt}=12s\frac{ds}{dt}$

Now, knowing the length of the sides, simply divide to find the ratio between the rate of change of the surface area and diagonal:

$12s\frac{ds}{dt}=(\phi)\frac{ds}{dt}$

$\phi=12s$

$\phi =12(15)=180$

Report an Error

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Calculus 1 : How to find rate of change

Study concepts, example questions & explanations for Calculus 1

All Calculus 1 Resources

Example Questions

Example Question #751 : Rate

Example Question #761 : Rate

Example Question #762 : Rate

Example Question #763 : Rate

Example Question #671 : Rate Of Change

Example Question #765 : Rate

Example Question #671 : How To Find Rate Of Change

Example Question #672 : How To Find Rate Of Change

Example Question #673 : How To Find Rate Of Change

Example Question #674 : How To Find Rate Of Change

All Calculus 1 Resources

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