Conceptual Physics (12th Edition)

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

Chapter 24 - Think and Explain: 42

Answer

Try testing the door with a magnet.

Work Step by Step

Aluminum is not magnetic, so if it sticks, s/he is mistaken. However, if it doesn’t stick, that doesn't prove that the door is made of aluminum, because there are many nonmagnetic materials.
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