Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 6 - Trigonometric Functions - Chapter Review - Review Exercises - Page 435: 52



Work Step by Step

We know that the ships can see a blinking light every $5$ seconds. There are $2$ lights, hence a complete rotation takes $10$ seconds. Hence the rotation speed: $\frac{1\text{rev}}{10\text{sec}}=0.1\frac{\text{rev}}{\text{sec}}=0.1\frac{2\pi\text{rad}}{\text{sec}}=0.2\pi\frac{\text{rad}}{\text{sec}}$.
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