A solid of revolution is a solid obtained by rotating a region in the plane about an axis. The sphere and right circular cone are familiar examples of.

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Volumes of Solids of Revolution

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Presentation transcript:

A solid of revolution is a solid obtained by rotating a region in the plane about an axis. The sphere and right circular cone are familiar examples of such solids. Each of these is “swept out” as a plane region revolves around an axis.

Volume of Revolution: Disk Method If f (x) is continuous and f (x) ≥ 0 on [a, b], then the solid obtained by rotating the region under the graph about the x-axis has volume [with R = f (x)]

Calculate the volume V of the solid obtained by rotating the region under y = x 2 about the x-axis for 0 ≤ x ≤ 2.

The region between two concentric circles is called an annulus, or more informally, a washer.

Region Between Two Curves Find the volume V obtained by revolving the region between y = x and y = 2 about the x-axis for 1 ≤ x ≤ 3.

Revolving About a Horizontal Axis Find the volume V of the “wedding band” obtained by rotating the region between the graphs of f (x) = x and g (x) = 4 − x 2 about the horizontal line y = − 3.

Find the volume obtained by rotating the graphs of f (x) = 9 − x 2 and y = 12 for 0 ≤ x ≤ 3 about (a) the line y = 12 (b) the line y = 15.

Find the volume obtained by rotating the graphs of f (x) = 9 − x 2 and y = 12 for 0 ≤ x ≤ 3 about (a) the line y = 12 (b) the line y = 15.

We can use the disk and washer methods for solids of revolution about vertical axes, but it is necessary to describe the graph as a function of y—that is, x = g (y). Revolving About a Vertical Axis Find the volume of the solid obtained by rotating the region under the graph of f (x) = 9 − x 2 for 0 ≤ x ≤ 3 about the vertical axis x = −2.