Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 7 - Applications of Trigonometry and Vectors - Section 7.4 Vectors, Operations, and the Dot Product - 7.4 Exercises - Page 329: 39

Answer

$38.8,28.0$

Work Step by Step

First converting the angle to decimal degrees: $35^{\circ}50'=35\frac{50}{60}=35.83^{\circ}$ The formulas for horizontal component $x$ and vertical component $y$ of a vector $\textbf{v}$ having magnitude $|\textbf{v}|$ and direction angle $\theta$ are: $x=|\textbf{v}|\cos\theta$ and $y=|\textbf{v}|\sin\theta$ Substituting the values of $|\textbf{v}|=47.8$ and $\theta=35.83^{\circ}$ in the formulas above, $x=47.8\cos35.83^{\circ}\approx38.8$ $y=47.8\sin35.83^{\circ}\approx28.0$ Therefore, $|\textbf{v}|=\langle 38.8,28.0 \rangle$
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