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Calculate the average value of $ f(x) = x \sec^2 …

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Problem 65 Hard Difficulty

Calculate the volume generated by rotating the region bounded by the curves $ y = \ln x $, $ y = 0 $ and $ x = 2 $ about each axis.
(a) The y-axis
(b) The x-axis

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Chapter 7

Techniques of Integration

Section 1

Integration by Parts

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Video Transcript

The problem is calculated: the volume generated by rotating the region, bounded by the curves y, equal to x y equal to 0 and x, equal to 2 about each axis, is about the y axis is about x axis, so first we can jarrah x and y, and It s there's a graph of the curve y go to x y equals to 0 and x equal to twont, so the region is this part now for a? If we retain this region about y axis, then we can use cylindrical shell method to find the volume is equal to 2 pi, integral from 1 to 2 x times x d x. Then we kind o use method of integration by powers that, u is equal to? U n x and the aprons equal to x, then you prom is equal to 1 over x and the v is equal to 1 half x squared. So this is equal to 2 pi times, u times 3. So this is 1 half x, squared x from 1 to 2 minus the integral from 1 to 2 on your prime times was so. This is 1 half like the x. This is equal to 2 pi times plunging 2 and 1 to this function. This is 2 times in 2, minus 0 and minus 1 fourth x, squared from 1 to 2 point. This is 2 pi times 2 times into minus. This is 3 over 4 foyotthis region about x axis. So we kind of use this kamis is equal to integral from 1 to 2 pi times n x square, then for this integral we can light, can also use integration by parts and that u is equal to x square and is equal to 1. Then your prime is equal to 2 times x, ove x and the prime and is equal to x pot. Now this integral is equal to pi times: u times 3. So this is x, l n x, squared from 1 to 2 minus integral from 1 to 2 priss 2 times x. Now, for this integral we can use integration by pontais equal to u n, x and apron is equal to 1 and prim is equal to 1. Over x and v is equal to x, so this is equal to pi times plug in 2 and 1 to this function. This is 2 into square. Minus 2 times is integration by parts, so this is x and x from 1 to 2 minus integral from 1 to 2. So this is equal to pi 2 times l into square minus 2 times 2 times. N 2 minus this is 1. This is the result.

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Problem

Calculate the average value of $ f(x) = x \sec^2 …

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Calculus: Early Transcendentals

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Watch More Solved Questions in Chapter 7

Video Transcript

James Stewart

Calculus: Early Transcendentals

Anna Marie Vagnozzi

Heather Zimmers

Kristen Karbon

Michael Jacobsen

This textbook answer is only visible when subscribed! Please subscribe to view the answer

Calculus: Early Transcendentals

Anna Marie Vagnozzi

Heather Zimmers

Kristen Karbon

Michael Jacobsen

James StewartCalculus: Early Transcendentals

Anna Marie Vagnozzi

Heather Zimmers

Kristen Karbon

Michael Jacobsen

James Stewart

Calculus: Early Transcendentals