Find the volume of the solid obtained by rotating the region bounded by the curve y = sin (7x) and the r-axis, 0 < x < about the y-axis. V 7 V =

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter9: Surfaces And Solids
Section9.CR: Review Exercises
Problem 22CR
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Question
Find the volume of the solid obtained by rotating the region bounded by the curve y
sin(72?)
and the x-axis, 0 < x <
V7
about the y-axis.
V =
||
Transcribed Image Text:Find the volume of the solid obtained by rotating the region bounded by the curve y sin(72?) and the x-axis, 0 < x < V7 about the y-axis. V = ||
Note: In the text, all questions use 62.5 pounds/ft as the force per volume density of water.
In metric, we would need Newtons/meter. The mass density per volume of water is 1000 kg/m³.
To convert this into a force density per volume, we multiply by gravity, approximately 9.8 m/s?. The
resulting quantity is the force density per volume in metric: 9800 N/m³.
Transcribed Image Text:Note: In the text, all questions use 62.5 pounds/ft as the force per volume density of water. In metric, we would need Newtons/meter. The mass density per volume of water is 1000 kg/m³. To convert this into a force density per volume, we multiply by gravity, approximately 9.8 m/s?. The resulting quantity is the force density per volume in metric: 9800 N/m³.
Expert Solution
Step 1

The volume of the solid obtained by rotating can be found by using the cylindrical shells method. In this method, we integrate the circumference by multiplying with the height with a very small thickness of the cylinder shells.

V=ab2πxf(x)dx, here 2πx is the circumference of the cylinder with radius x and height f(x) and thickness dx.

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