9709 P41 - Jun 2021 - Q6
3712
Three coplanar forces of magnitudes 10 N, 25 N, and 20 N act at a point O in the directions shown in the diagram.
(a) Given that the component of the resultant force in the x-direction is zero, find \(\alpha\), and hence find the magnitude of the resultant force.
(b) Given instead that \(\alpha = 45\), find the magnitude and direction of the resultant of the three forces.
