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Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621

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Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621
Textbook Problem

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified line. Sketch the region, the solid, and a typical disk or washer.

y = x 3 ,   y = x ,   x 0 ; about the x-axis

To determine

To find:

The volume of the solid obtained by rotating the region bounded by the given curves about the x axis and sketch the region, the solid, and a typical disk or washer.

Explanation

1) Concept:

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

A=π outer radius2 -π inner radius2

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

V= abA(x)dx

2) Given:

y=x3, y=x ,  x0; about the x- axis

3) Calculation:

The region is bounded by y=x3, y=x,  x0 and rotated about the x- axis is shown below.

Here, the region is rotated about x– axis, so the cross-section is perpendicular to x-axis.

A cross section of the solid is thewasher with outer radius x and inner radius x3.

So, its cross sectional area becomes

Ax=πouter radius2-πinner radius2 =πx2-πx32

=π(x2-x6)

Here, the region of integration is bounded by y=x3, y=x,  x0.

At the point of intersection of both curves

x3=x 

x3-x=0

 xx2-1=0

x=0, x=1  since x0

Therefore, the solid lies between  x=0 and x= 1

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