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Chapter 5: Problem 4

Use the method of cylindrical shells to find the volume of the solid generated by revolving the region about the indicated axis or line.

Short Answer

Expert verified
To find the volume of the solid generated by revolving the region around the indicated axis or line using the method of cylindrical shells, follow these general steps: 1. Identify the region and axis of rotation. 2. Determine the method for integration (with respect to x or y). 3. Set up the formula for cylindrical shells: \( V = 2\pi \int_a^b r(y)h(y)dy \) (with respect to y) or \( V = 2\pi \int_a^b r(x)h(x)dx \) (with respect to x), where r is the distance from the axis of rotation and h is the height of the shell. 4. Find the expressions for r and h in terms of x or y. 5. Set up the integral by substituting the expressions for r and h and identifying the limits of integration a and b. 6. Evaluate the integral to find the volume of the solid generated by the region when revolved around the axis or line.

Step by step solution

01

Identify the region and axis of rotation

Find the equation of the region to be revolved and the axis or line around which it will be rotated.
02

Determine the method for integration

Decide whether you will integrate with respect to x or y, based on the axis of rotation and the shape of the region. If the axis of rotation is vertical, it is usually best to integrate with respect to y, and if the axis of rotation is horizontal, it is usually best to integrate with respect to x.
03

Set up the formula for cylindrical shells

The formula for the volume of a solid generated using the method of cylindrical shells is \[ V = 2\pi \int_a^b r(y)h(y)dy \] for integration with respect to y, and \[ V = 2\pi \int_a^b r(x)h(x)dx \] for integration with respect to x. For both formulas, r is the distance from the axis of rotation to the outer edge of the cylindrical shell, and h is the height of the shell.
04

Find the expressions for r and h

Express r and h in terms of x or y (depending on which variable you are integrating with respect to) based on the equation of the region and the axis of rotation.
05

Set up the integral

Substitute the expressions for r and h from Step 4 into the formula from Step 3 and set up the integral. Identify the limits of integration a and b, which should be the points where the region begins and ends along the axis of rotation.
06

Evaluate the integral

Evaluate the integral to find the volume of the solid generated by the region when it is revolved around the given axis or line. This may require using integration techniques such as substitution or integration by parts. The general steps listed above can be applied to any specific problem involving finding the volume of a solid generated by revolving a region around an axis or line using the method of cylindrical shells.

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