Engineering Mechanics: Statics & Dynamics (14th Edition)

Published by Pearson
ISBN 10: 0133915425
ISBN 13: 978-0-13391-542-6

Chapter 2 - Force Vectors - Section 2.4 - Addition of a System of Coplanar Forces - Problems - Page 43: 53

Answer

$\vec {F_1}=(-15\hat i-15\sqrt 3\hat j)\;kN$ $\vec {F_2}=(-10\hat i+24\hat j)\;kN$

Work Step by Step

Having determined the magnitudes and directions of the components of each force, we can express each force as a Cartesian vector. $\vec{F_1}=(āˆ’30\sin30^\circ\hat iāˆ’30\cos30^\circ\hat j)\;kN$ or, $\vec {F_1}=(-15\hat i-15\sqrt 3\hat j)\;kN$ and $\vec{F_2}=\Big\{-26\Big(\frac{5}{13}\Big)\hat i+26\Big(\frac{12}{13}\Big)\hat j\Big\}\;kN$ or, $\vec {F_2}=(-10\hat i+24\hat j)\;kN$ where $\hat i$ and $\hat j$ are the unit vectors along positive $x$ and $y$ axes respectively.
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