University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 13 - Gravitation - Problems - Discussion Questions - Page 424: Q13.15

Answer

The Earth moves faster in November than in May.

Work Step by Step

According to Kepler’s second law, the sector velocity is constant. As explained on page 411, and demonstrated in equation 13.15, when the planet is close to the sun and r is small, then the speed v is large. The Earth moves faster in November, when it is closer to the sun, than in May when it is farther away.
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