Calculus 2 : Integrals

Study concepts, example questions & explanations for Calculus 2

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Example Questions

Example Question #131 : Integral Applications

What is the average value of the function  on the interval ?

Possible Answers:

Correct answer:

Explanation:

The average value of the function  on the interval  is equal to 

Substitute . Then , and ; the bounds of integration become 2 and 6, and the above expression becomes

Example Question #311 : Integrals

What is the average value of the function  on the interval  ?

Possible Answers:

Correct answer:

Explanation:

The average value of the function  on the interval  is equal to 

 

For now, we look at the indefinite integral  . The integral can be changed by setting  and . Then 

 , or 

and 

so 

which is the antiderivative.

Now, we can find the definite integral, and, subsequently, the average value:

Example Question #313 : Integrals

Approximate the length of the curve of  on the interval . Use Simpson's Parabolic Rule with  to make your estimate to the nearest thousandth.

Possible Answers:

Correct answer:

Explanation:

The length of the curve of  on the interval  can be determined by evaluating the integral

.

, so

, and the integral to be approximated is

, or simplified,

.

 

We divide the interval   into four subintervals of width  each, so 

.

By Simpson's rule, we can estimate the integral by evaluating

where .

We evaluate  at these points, then substitute:

The approximation is therefore

Example Question #132 : Integral Applications

Approximate the length of the curve of  on the interval . Use Simpson's Parabolic Rule with  to make your estimate to the nearest thousandth.

Possible Answers:

Correct answer:

Explanation:

The length of the curve of  on the interval  can be determined by evaluating the integral

.

, so

, and the integral to be approximated is

We divide the interval   into four subintervals of width  each, so 

.

By Simpson's rule, we can estimate the integral by evaluating

where 

We evaluate  at these points, then substitute:

The approximation is therefore

Example Question #138 : Integral Applications

What is the average value of the function  on the interval  ?

Possible Answers:

Correct answer:

Explanation:

The average value of the function  on the interval  is equal to

, or

.

To evaluate this integral, we note that  has negative value on  and positive value on , so on  can be defined as 

or 

Therefore, the average value of  is equal to

Example Question #312 : Integrals

What is the average value of the function  on the interval  ?

Possible Answers:

Correct answer:

Explanation:

The average value of the function  on the interval  is 

.

We can integrate the indefinite integral 

 

as follows:

Set .

Then  

 or 

and 

.

Therefore, 

Therefore, the average value is:

Example Question #313 : Integrals

What is the average value of the function  on the interval  ?

Possible Answers:

Correct answer:

Explanation:

The average value of the function  on the interval  is equal to 

.

Substitute . Subsequently,  and . The bounds of integration become  and , so the integral can be rewritten as

.

Example Question #1 : Average Values And Lengths Of Functions

What is the arc length if  from ?

Possible Answers:

Correct answer:

Explanation:

Write the formula for arc length.

Calculate the derivatives.

Substitute the derivatives and the bounds into the integral.

Example Question #1 : Average Values And Lengths Of Functions

What is the average value of the function

  

from  to

Possible Answers:

Correct answer:

Explanation:

The average value of a function p(t) from t=a to t=b is found with the integral

In this case, we must compute the value of the integral

.

A substitution makes this integral clearer. Let . Then . We should also rewrite the limits of integration in terms of u. When t = 0, u=1, and when t = 2, u = 5. Making these substitutions results in the integral

Evaluating this integral using the fact that

 yields

Example Question #1 : Average Values And Lengths Of Functions

What is the average value of the function  over the interval ?

Possible Answers:

Correct answer:

Explanation:

In general, the average value of a function  over the interval  is 

 

This means that the average value of  over  is 

.

Since the antiderivative of  is , the integral evaluates to 

.

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