Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson
ISBN 10: 0321993721
ISBN 13: 978-0-32199-372-4

Chapter 9 - For Thought and Discussion - Page 163: 5

Answer

Please see the work below.

Work Step by Step

We know that in all the three cases, the mass of the hourglass remains the same; only the center of mass changes. When the sand moves from top to bottom, the center of mass of the glass moves from top to bottom keeping the mass of the hourglass constant.
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