   Chapter 5.2, Problem 36E

Chapter
Section
Textbook Problem

# Use a graph to find approximate x-coordinates of the points of intersection of the given curves. Then use your calculator to find (approximately) the volume of the solid obtained by rotating about the x-axis the region bounded by these curves. y = 2 x − x 2 3 ,   y = x 2 / ( x 2 + 1 )

To determine

To find:

Approximate x coordinate of the points of intersection of the given curves  by using the graph, and then use the calculator to find (approximately) the volume of the solid obtained by rotating the bounded region about x axis.

Explanation

1) Concept:

i. If the cross section is a washer with inner radius rin and outer radius rout, then area of the washer is obtained by subtracting the area of the inner disk from the area of the outer disk,

ii. The volume of the solid of revolution about the x-axis is

V= abA(x)dx

2) Given:

y=2x-x23, y=x2x2+1; about the x axis

3) Calculation:

Region bounded by given curves is shown below:

From the above graph,

x coordinate of the points of intersection: x=0 and  x  1.755

The cross section is perpendicular to the x-axis, and it is a washer

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