Multivariable Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 0-53849-787-4
ISBN 13: 978-0-53849-787-9

Chapter 12 - Vectors and the Geometry of Space - 12.2 Exercises - Page 823: 30

Answer

Horizontal Component: $F_x \approx 39.4$ N Vertical Component: $F_y \approx 30.8$ N

Work Step by Step

We can visualize the force as a vector $\textbf{F}$ drawn from the origin in the first quadrant, with the x-axis coinciding with the horizontal level path. We can then see $\textbf{F}$ as the hypotenuse of a right triangle with $\theta = 38^{\circ}$ adjacent to a horizontal leg $F_x$ along the x-axis (which is the x-component) and opposite a vertical leg $F_y$ parallel to the y-axis (which is the y-component). Since $|\textbf{F}| = 50$ N is the magnitude of $\textbf{F}$ and thus the length of the hypotenuse, we can use trigonometry to find the components: $F_x = |\textbf{F}| \cos \theta = 50$ N $\cos 38^{\circ} \approx 39.4$ N $F_y = |\textbf{F}| \sin \theta = 50$ N $\sin 38^{\circ} \approx 30.8$ N
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