Conceptual Physics (12th Edition)

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

Chapter 9 - Think and Discuss: 106

Answer

Decrease. Increase.

Work Step by Step

If you tunnel into a uniform-density star, your weight decreases. The gravitational attraction of the mass above you partly cancels the attraction of the mass below you. This is discussed on page 171 and shown in Figure 9.23. If you stand on the surface of a shrinking star, the mass beneath your feet stays the same, and you get closer to the CM. The force increases.
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