Answer
The arc is a catenary.
Work Step by Step
The balloons lift straight upward on the arch, acting much like an upward gravitational force. The arc assumes the shape of a hanging chain.
See Figure 12.14, and the discussion 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 14 - Think and Explain - Page 279-281: 77
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