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Example Questions
Example Question #301 : Integrals
Evaluate the following trigonometric integral:
To solve this, first factor out one cosine and write the rest in terms of sine:
From here, we can do a substitution where u=sin(x) and du=cos(x)dx:
Finally, re-substitute sin(x) for u:
Example Question #1 : Volume Of Cross Sections And Area Of Region
Using the method of cylindrical disks, find the volume of the region revolved around the x-axis of the graph of
on the interval
units cubed
units cubed
units cubed
units cubed
units cubed
The formula for volume of the region revolved around the x-axis is given as
where
As such
When taking the integral, we use the inverse power rule which states
Applying this rule term by term we get
And by the corollary of the Fundamental Theorem of Calculus
As such the volume is
units cubed
Example Question #1 : Volume Of Cross Sections And Area Of Region
Find the volume of the solid generated by rotating about the y-axis the region under the curve , from
to
.
None of the other answers
Since we are revolving a function of around the y-axis, we will use the method of cylindrical shells to find the volume.
Using the formula for cylindrical shells, we have
.
Example Question #2051 : Calculus Ii
Find the volume of the solid region swept out by the area bounded by the the functions and
about the
-axis.
Find the volume of the solid region swept out by the area bounded by the the functions and
about the
-axis.
The cross sectional area of the solid can be written as a function of by first finding the cross-sectional areas swept out by each of the individual functions as they rotate about the x-axis, and then subtracting the inner area.
Visualize a line drawn perpendicularly to the x-axis at some point meeting the function . As we rotate about the x-axis, we sweep out a circular cross-sectional area with a radius equal to the function value
at the corresponding value of
. The area of this disk is therefore:
Similarly for the function , the cross-sectional area is:
The plot of the two functions helps visualize the geometry. The parabola is clearly the "inner" radius, and therefore we must subtract the areas from
to find the cross-sectional area of the solid:
Now we must find the limits of integration by finding the intersection points.
Solve for
The other solution is . Now simply integrate the cross sectional area
over the interval
to find the volume of the solid,
To simplify further, write the terms with a common denominator and factor.
Example Question #11 : Volume Of A Solid
Find the volume of solid of revolution for the given function:
.
The volume of a solid of revolution for a given function is found using the disk method. Answer is obtained upon evaluating the following integral:
Example Question #131 : 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.
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 #2053 : Calculus Ii
Give the arclength of the graph of the function on the interval
.
The length of the curve of on the interval
can be determined by evaluating the integral
.
so
.
The above integral becomes
Substitute . Then
,
, and the integral becomes
Example Question #1 : Length Of Curve, Distance Traveled, Accumulated Change, Motion Of Curve
Give the arclength of the graph of the function on the interval
.
The length of the curve of on the interval
can be determined by evaluating the integral
.
, so
The integral becomes
Use substitution - set . Then
, and
. The bounds of integration become
and
, and the integral becomes
Example Question #302 : Integrals
Give the arclength of the graph of the function on the interval
.
The length of the curve of on the interval
can be determined by evaluating the integral
.
, so
and the integral becomes
Use substitution - set . Then
, and
. The bounds of integration become 0 and 6; the integral becomes
Example Question #131 : Integral Applications
What is the average value of the function on the interval
?
The average value of the function on the interval
is equal to
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