How to solve a related rates problem with an expanding square?

In summary, the problem involves finding the value of the side of an expanding square when its area is increasing three times as fast as its side. Using implicit differentiation, it is determined that the value of s is equal to 3/2.
  • #1
carlodelmundo
133
0

Homework Statement



When the area of an expanding square, in square units, is increasing three times as fast as its side is increasing, in linear units, the side is

a.) 2/3
b.) 3/2
c) 3
d) 2
e) 1

Homework Equations



A = s^2
dA/dt = 3s^2


The Attempt at a Solution



Can anyone give me hints on how to start this problem?
 
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  • #2
Start by differentiating A=s^2 with respect to time correctly. Use implicit differentiation.
 
  • #3
Okay, Dick.

I get dA/dt = 2s dS/Dt. Since it's saying that the area is increasing three times as fast as its side is increasing... 2s must equal to 3. or s = 3/2

is this correct?
 
  • #4
carlodelmundo said:
Okay, Dick.

I get dA/dt = 2s dS/Dt. Since it's saying that the area is increasing three times as fast as its side is increasing... 2s must equal to 3. or s = 3/2

is this correct?

You betcha.
 
  • #5
Thank you, Sir.
 

FAQ: How to solve a related rates problem with an expanding square?

What is "Related Rates" in BC Calculus?

Related Rates is a topic in BC Calculus that deals with finding the rate of change of one variable with respect to another variable. It involves using derivatives to solve problems involving changing quantities.

What are some common examples of related rates problems?

Some common examples of related rates problems include finding the rate at which the sides of a triangle are changing, the rate at which the volume of a sphere is changing, and the rate at which the height of a balloon is changing.

How do you approach solving related rates problems?

To solve related rates problems, you first need to identify the variables involved and the given rate of change. Then, you can use the chain rule and implicit differentiation to find the related rates equation. Finally, you can plug in the given values and solve for the unknown rate of change.

Can you use related rates in real-world applications?

Yes, related rates problems are often used in real-world applications in fields such as physics, engineering, and economics. They can be used to model changing quantities and make predictions about how they will change over time.

What are some common mistakes to avoid when solving related rates problems?

Some common mistakes to avoid when solving related rates problems include not properly identifying the variables, not using the chain rule or implicit differentiation correctly, and not carefully setting up the related rates equation. It is also important to check your units and make sure they are consistent throughout the problem.

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