Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 20 - Think and Explain: 79

Answer

The singer breaks the glass by using resonance.

Work Step by Step

If the singer's voice matches the glass's natural frequency of vibration, the glass will vibrate with greater and greater amplitude until the flexing exceeds the mechanical limits of the glass, and it shatters. If you perform an internet search for "shatter glass resonance singer", you will no doubt find some enlightening videos.
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