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Calculus 1 : How to find rate of change

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Example Questions

Example Question #681 : 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 66?

Possible Answers:

792

396

176

704

Correct answer:

792

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:

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

$\phi=12s$

$\phi =12(66)=792$

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Example Question #771 : 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 sides when its sides have length 102?

Possible Answers:

2448

1224

204

612

1632

Correct answer:

1224

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:

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

$\phi=12s$

$\phi =12(102)=1224$

Report an Error

Example Question #681 : 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 111?

Possible Answers:

444

666

888

1332

2664

Correct answer:

1332

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:

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

$\phi=12s$

$\phi =12(111)=1332$

Report an Error

Example Question #773 : 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 sides when its sides have length 205?

Possible Answers:

270

2460

810

1080

Correct answer:

2460

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:

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

$\phi=12s$

$\phi =12(205)=2460$

Report an Error

Example Question #682 : 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 sides when its sides have length $\frac{7}{48}$ ?

Possible Answers:

$\frac{7}{192}$

$\frac{7}{8}$

$\frac{7}{96}$

$\frac{7}{2}$

$\frac{7}{4}$

Correct answer:

$\frac{7}{4}$

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:

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

$\phi=12s$

$\phi =12(\frac{7}{48})=\frac{7}{4}$

Report an Error

Example Question #681 : 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 sides when its sides have length $\frac{11}{26}$ ?

Possible Answers:

$\frac{22}{13}$

$\frac{66}{13}$

$\frac{132}{13}$

$\frac{11}{13}$

$\frac{33}{13}$

Correct answer:

$\frac{66}{13}$

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:

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

$\phi=12s$

$\phi =12(\frac{11}{26})=\frac{66}{13}$

Report an Error

Example Question #683 : 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 sides when its sides have length $\frac{5}{33}$ ?

Possible Answers:

$\frac{40}{11}$

$\frac{20}{11}$

$\frac{10}{11}$

$\frac{20}{99}$

$\frac{20}{33}$

Correct answer:

$\frac{20}{11}$

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:

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

$\phi=12s$

$\phi =12(\frac{5}{33})=\frac{20}{11}$

Report an Error

Example Question #3601 : Calculus

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 sides when its sides have length $\frac{31}{21}$ ?

Possible Answers:

$\frac{124}{21}$

$\frac{124}{7}$

$\frac{248}{21}$

$\frac{31}{7}$

$\frac{93}{7}$

Correct answer:

$\frac{124}{7}$

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:

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

$\phi=12s$

$\phi =12(\frac{31}{21})=\frac{124}{7}$

Report an Error

Example Question #3602 : Calculus

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 sides when its sides have length $\frac{5}{39}$ ?

Possible Answers:

$\frac{10}{39}$

$\frac{10}{13}$

$\frac{20}{13}$

$\frac{20}{39}$

$\frac{40}{39}$

Correct answer:

$\frac{20}{13}$

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:

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

$\phi=12s$

$\phi =12(\frac{5}{39})=\frac{20}{13}$

Report an Error

Example Question #3603 : Calculus

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 sides when its sides have length $\frac{2}{87}$ ?

Possible Answers:

$\frac{2}{29}$

$\frac{16}{29}$

$\frac{8}{29}$

$\frac{1}{29}$

$\frac{4}{29}$

Correct answer:

$\frac{8}{29}$

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:

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

$\phi=12s$

$\phi =12(\frac{2}{87})=\frac{8}{29}$

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 #681 : How To Find Rate Of Change

Example Question #771 : Rate

Example Question #681 : How To Find Rate Of Change

Example Question #773 : Rate

Example Question #682 : How To Find Rate Of Change

Example Question #681 : How To Find Rate Of Change

Example Question #683 : How To Find Rate Of Change

Example Question #3601 : Calculus

Example Question #3602 : Calculus

Example Question #3603 : Calculus

All Calculus 1 Resources

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