Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 7 - Applications of Trigonometry and Vectors - Section 7.5 Applications of Vectors - 7.5 Exercises - Page 342: 15

Answer

$v\approx\left\langle 38.751,27.982 \right\rangle$.

Work Step by Step

The horizontal component of a vector $v=\left\langle a,b \right\rangle$ having magnitude $|v|$ and direction angle $\theta$ is given by $a=|v|\cos\theta$. Similarly, the vertical component is given by $b=|v|\sin\theta$. Now we have $|v|=47.8$ and $\theta=35^{\circ}50'=35^{\circ}+\left(\frac{50}{60}\right)^{\circ}=35^{\circ}+0.833^{\circ}=35.833^{\circ}$ since $1'=\left(\frac{1}{60}\right)^{\circ}$ therefore $\theta=35.833^{\circ}$. Hence, the horizontal component is \begin{align*} a=&|v|\cos\theta\\ a=&47.8\cos35.833^{\circ}~~~ \text{use} ~~\theta=35.833^{\circ} ,|v|=47.8\\ a=&47.8\times 0.8107\\ a=&38.751 ~~~(\text{approximated to three decimal places}), \end{align*} and the vertical component is \begin{align*} b=&|v|\sin\theta\\ b=&47.8\sin35.833^{\circ}~~~ \text{use} ~~\theta=35.833^{\circ} ,|v|=47.8\\ b=&47.8\times 0.5854\\ b =&27.982~~~~~~ (\text{approximated to three decimal places}). \end{align*} Hence, the vector $v=\left\langle a,b \right\rangle\approx\left\langle 38.751,27.982 \right\rangle$ .
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