Answer
a
Work Step by Step
The $R$ factor is directly related to the thickness of the insulation. Since the thickness doubled, we can conclude that the $R$ factor must double as well. Thus, $\fbox{a}$ is the correct answer.
Essential University Physics: Volume 1 (3rd Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0321993721
ISBN 13:
978-0-32199-372-4
Chapter 16 - Exercises and Problems - Page 302: 85
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