A solid is obtained by revolving the shaded region about the specified line. (a) Sketch the solid and a typical disk or washer. (b) Set up an integral for the volume of the solid. (c) Evaluate the integral to find the volume of the solid. About the x-axis
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Textbook Solutions for Calculus: Early Transcendentals
Question
A dilation of the plane with scaling factor c is a transformation that maps the point (x, y) to the point (cx, cy). Applying a dilation to a region in the plane produces a geometrically similar shape. A manufacturer wants to produce a 5-liter (5000 cm3) terra-cotta pot whose shape is geometrically similar to the solid obtained by rotating the region ℛ1 shown in the figure about the y-axis.
(a) Find the volume V1 of the pot obtained by rotating the region ℛ1.
(b) Show that applying a dilation with scaling factor c transforms the region ℛ1 into the region ℛ2.
(c) Show that the volume V2 of the pot obtained by rotating the region ℛ2 is c3V1.
(d) Find the scaling factor c that produces a 5-liter pot.
Solution
The first step in solving 6.2 problem number trying to solve the problem we have to refer to the textbook question: A dilation of the plane with scaling factor c is a transformation that maps the point (x, y) to the point (cx, cy). Applying a dilation to a region in the plane produces a geometrically similar shape. A manufacturer wants to produce a 5-liter (5000 cm3) terra-cotta pot whose shape is geometrically similar to the solid obtained by rotating the region ℛ1 shown in the figure about the y-axis.(a) Find the volume V1 of the pot obtained by rotating the region ℛ1.(b) Show that applying a dilation with scaling factor c transforms the region ℛ1 into the region ℛ2.(c) Show that the volume V2 of the pot obtained by rotating the region ℛ2 is c3V1.(d) Find the scaling factor c that produces a 5-liter pot.
From the textbook chapter Volumes you will find a few key concepts needed to solve this.
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