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June 2021 p42 q2
3711
Coplanar forces of magnitudes 34 N, 30 N, and 26 N act at a point in the directions shown in the diagram. Given that \(\sin \alpha = \frac{5}{13}\) and \(\sin \theta = \frac{8}{17}\), find the magnitude and direction of the resultant of the three forces.
Solution
First, resolve the forces horizontally and vertically. Let the horizontal component be \(X\) and the vertical component be \(Y\).