Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 8 - Application of Trigonometry - 8.4 Algebraically Defined Vectors and the Dot Product - 8.4 Exercises - Page 790: 24

Answer

$\lt -1.53, -129 \gt $

Work Step by Step

Let $v$ is a vector that has a magnitude $|v|$ and the direction angle of $\theta$. Firstly, we need to convert the given angle to standard position. That is, $ \theta =360^{\circ}- 140^{\circ} = 220^{\circ}$ The magnitude of horizontal component is given by: $v_x=|v| \cos \theta= 2 \cos 220^{\circ}= -1.53$ And The magnitude of vertical component is given by: $v_y=|v| \sin \theta= 2 \sin 220^{\circ}= -1.29$ Thus, $v=\lt -1.53, -129 \gt $
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