Answer
In a properly constructed arch that is shaped like an inverted catenary, compressive forces push the stones in the arch together, and cement is not needed.
Work Step by Step
This is discussed on page 234.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 12 - Reading Check Questions (Comprehension) - Page 240: 17
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