BuyFindarrow_forward

Single Variable Calculus: Early Tr...

8th Edition
James Stewart
ISBN: 9781305270336

Solutions

Chapter
Section
BuyFindarrow_forward

Single Variable Calculus: Early Tr...

8th Edition
James Stewart
ISBN: 9781305270336
Textbook Problem

Find the area of the surface obtained by rotating the circle x2 + y2 = r2 about the line y = r.

To determine

To find: The area of the surface obtained by rotating the circle about the line y=r.

Explanation

Given information:

The equation of the circle is x2+y2=r2 about the line y=r.

Therefore, the circle is bounded between y=r and y=r.

Calculation:

Show the equations of the circle and line.

x2+y2=r2 (1)

y=r (2)

Rewrite the Equation (1) as follows

x2+y2=r2y2=r2x2y=r2x2 (3)

Show the Equation of curve for upper semicircle which is in positive x-axis:

y=r2x2 (4)

Substitute r2x2 for y in Equation (2)

y=rr2x2=rrr2x2=0 (5)

Rewrite the Equation (5) as follows:

For the circle, y=r when x=0, therefore

x=rr2x2 (6)

Show the Equation of curve for lower semicircle which is in negative x-axis:

y=r2x2 (7)

Substitute r2x2 for y in Equation (2):

y=rr2x2=rr+r2x2=0 (8)

Rewrite the Equation (8) as follows:

For the circle, y=r when x=0, therefore

x=r+r2x2 (9)

Calculate the area of the surface obtained by rotating the upper semi circle about the line y=r. using the relation:

S1=ab2πx1+(dydx)2dx (10)

Here, S1 is the area of the surface obtained by rotating the upper semicircle about the line y=r.

Differentiate both sides of Equation (4) with respect to x.

dydx=ddx(r2x2)=ddx[(r2x2)12]=12(r2x2)121(2x)=xr2x2

Substitute xr2x2 for dydx,rr2x2 for x, 0 for a, and 1 for b in Equation (10).

S1=rr2π(rr2x2)1+(xr2x2)2dx=20r2π(rr2x2)1+(x2r2x2)dx=4π0r(rr2x2)(r2x2+x2r2x2)dx=4π0r(rr2x2)r2r2x2dx

S1=4π0r(rr2x2)rr2x2dx=4π0r(r2r2x2r)dx (11)

Calculate the area of the surface obtained by rotating the lower semicircle about the line y=r using the relation:

S2=ab2πx1+(dydx)2dx (12)

Here, S2 is the area of the surface obtained by rotating the lower semicircle about the line y=r

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started
Sect-8.1 P-11ESect-8.1 P-12ESect-8.1 P-13ESect-8.1 P-14ESect-8.1 P-15ESect-8.1 P-16ESect-8.1 P-17ESect-8.1 P-18ESect-8.1 P-19ESect-8.1 P-20ESect-8.1 P-21ESect-8.1 P-22ESect-8.1 P-23ESect-8.1 P-24ESect-8.1 P-25ESect-8.1 P-26ESect-8.1 P-27ESect-8.1 P-28ESect-8.1 P-29ESect-8.1 P-30ESect-8.1 P-33ESect-8.1 P-34ESect-8.1 P-35ESect-8.1 P-36ESect-8.1 P-37ESect-8.1 P-38ESect-8.1 P-39ESect-8.1 P-40ESect-8.1 P-41ESect-8.1 P-42ESect-8.1 P-43ESect-8.1 P-44ESect-8.1 P-45ESect-8.1 P-46ESect-8.2 P-1ESect-8.2 P-2ESect-8.2 P-3ESect-8.2 P-4ESect-8.2 P-5ESect-8.2 P-6ESect-8.2 P-7ESect-8.2 P-8ESect-8.2 P-9ESect-8.2 P-10ESect-8.2 P-11ESect-8.2 P-12ESect-8.2 P-13ESect-8.2 P-14ESect-8.2 P-15ESect-8.2 P-16ESect-8.2 P-17ESect-8.2 P-18ESect-8.2 P-19ESect-8.2 P-20ESect-8.2 P-21ESect-8.2 P-22ESect-8.2 P-23ESect-8.2 P-24ESect-8.2 P-27ESect-8.2 P-28ESect-8.2 P-29ESect-8.2 P-30ESect-8.2 P-31ESect-8.2 P-32ESect-8.2 P-33ESect-8.2 P-35ESect-8.2 P-36ESect-8.2 P-37ESect-8.2 P-38ESect-8.2 P-39ESect-8.3 P-1ESect-8.3 P-2ESect-8.3 P-3ESect-8.3 P-4ESect-8.3 P-5ESect-8.3 P-6ESect-8.3 P-7ESect-8.3 P-8ESect-8.3 P-9ESect-8.3 P-10ESect-8.3 P-11ESect-8.3 P-12ESect-8.3 P-13ESect-8.3 P-14ESect-8.3 P-15ESect-8.3 P-16ESect-8.3 P-17ESect-8.3 P-18ESect-8.3 P-19ESect-8.3 P-20ESect-8.3 P-21ESect-8.3 P-22ESect-8.3 P-23ESect-8.3 P-24ESect-8.3 P-25ESect-8.3 P-26ESect-8.3 P-27ESect-8.3 P-28ESect-8.3 P-29ESect-8.3 P-30ESect-8.3 P-31ESect-8.3 P-32ESect-8.3 P-33ESect-8.3 P-34ESect-8.3 P-35ESect-8.3 P-36ESect-8.3 P-37ESect-8.3 P-38ESect-8.3 P-39ESect-8.3 P-40ESect-8.3 P-41ESect-8.3 P-42ESect-8.3 P-43ESect-8.3 P-44ESect-8.3 P-45ESect-8.3 P-46ESect-8.3 P-47ESect-8.3 P-48ESect-8.3 P-49ESect-8.3 P-50ESect-8.3 P-51ESect-8.4 P-1ESect-8.4 P-2ESect-8.4 P-3ESect-8.4 P-4ESect-8.4 P-5ESect-8.4 P-6ESect-8.4 P-7ESect-8.4 P-8ESect-8.4 P-9ESect-8.4 P-10ESect-8.4 P-11ESect-8.4 P-12ESect-8.4 P-13ESect-8.4 P-14ESect-8.4 P-15ESect-8.4 P-16ESect-8.4 P-17ESect-8.4 P-18ESect-8.4 P-19ESect-8.4 P-20ESect-8.4 P-21ESect-8.4 P-22ESect-8.4 P-23ESect-8.5 P-1ESect-8.5 P-2ESect-8.5 P-3ESect-8.5 P-4ESect-8.5 P-5ESect-8.5 P-6ESect-8.5 P-7ESect-8.5 P-8ESect-8.5 P-9ESect-8.5 P-10ESect-8.5 P-11ESect-8.5 P-12ESect-8.5 P-13ESect-8.5 P-14ESect-8.5 P-15ESect-8.5 P-16ESect-8.5 P-17ESect-8.5 P-18ESect-8.5 P-19ESect-8.5 P-20ESect-8.5 P-21ECh-8 P-1RCCCh-8 P-2RCCCh-8 P-3RCCCh-8 P-4RCCCh-8 P-5RCCCh-8 P-6RCCCh-8 P-7RCCCh-8 P-8RCCCh-8 P-9RCCCh-8 P-10RCCCh-8 P-1RECh-8 P-2RECh-8 P-3RECh-8 P-4RECh-8 P-5RECh-8 P-6RECh-8 P-7RECh-8 P-8RECh-8 P-9RECh-8 P-10RECh-8 P-11RECh-8 P-12RECh-8 P-13RECh-8 P-14RECh-8 P-15RECh-8 P-16RECh-8 P-17RECh-8 P-18RECh-8 P-19RECh-8 P-20RECh-8 P-21RECh-8 P-22RECh-8 P-23RECh-8 P-1PCh-8 P-2PCh-8 P-3PCh-8 P-4PCh-8 P-5PCh-8 P-6PCh-8 P-7PCh-8 P-8PCh-8 P-9PCh-8 P-10PCh-8 P-11PCh-8 P-12PCh-8 P-13P

Additional Math Solutions

Find more solutions based on key concepts

Show solutions add

In Exercises 5762, sketch the straight line defined by the given linear equation by finding the x- and y-interc...

Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach

In Exercises 1316, find the distance between the given pairs of points. (1,1)and(2,2)

Finite Mathematics and Applied Calculus (MindTap Course List)

Factor each expression completely: 2x2+11x+14

Elementary Technical Mathematics

In the graph at the right, limx1f(x)=. a) 2 b) 1 c) 3 d) does not exist

Study Guide for Stewart's Single Variable Calculus: Early Transcendentals, 8th

Solve each equation or inequality. |2x1|=|2x+1|

College Algebra (MindTap Course List)

Explain the difference between passive and active deception.

Research Methods for the Behavioral Sciences (MindTap Course List)