Essential University Physics: Volume 1 (3rd Edition)

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

Chapter 15 - For Thought and Discussion: 11

Answer

Please see the work below.

Work Step by Step

We know that as the helium balloon rises, the density of atmospheric air decreases and at a certain point it becomes equal to the density of the balloon when the balloon stops to rise. But a cork has a density less than that of water and as it rises, the density of water remains the same.
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