Conceptual Physics (12th Edition)

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

Chapter 2 - Think and Explain: 55

Answer

The tension will be greater if the line sags only a little.

Work Step by Step

The diagonal of a parallelogram represents the resultant, or sum, of the two vectors that are used to construct the parallelogram. This is discussed on page 29. Draw a parallelogram representing the 2 rope forces, where the upward resultant force is equal and opposite to the bird’s weight. Long vectors (i.e., large forces) for the parallelogram are needed when the clothesline sags only a little and the ropes are nearly horizontal.
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