Conceptual Physics (12th Edition)

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

Chapter 10 - Reading Check Questions (Comprehension): 10

Answer

The speed v and the curvature are closely related. After an elapsed time t, it will have moved a horizontal distance vt and fallen a vertical distance $\frac{1}{2}gt^{2}$ below the horizontal. If the Earth's surface curves downward by exactly that distance, the projectile will be at the same height above the surface.

Work Step by Step

This is discussed on page 190.
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