Mathematics (AS & A Level) · May / June 2021 · Paper 43 · Question 3

40 N 30 N 20 N F N 60Å 1Å "Å !Å Four coplanar forces act at a point. The magnitudes of the forces are 20 N, 30 N, 40 N and F N. The directions of the forces are as shown in the diagram, where sin !Å = 0.28 and sin "Å = 0.6. Given that the forces are in equilibrium, find F and 1. [6]

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