1. The problem statement, all variables and given/known data What should be the tension in the wire used in teeth braces be, given that the net force exerted on the tooth has to be 0.7806 N? The angle between the two forces is 156.5°. 2. Relevant equations I think we may have to find the centre of mass 3. The attempt at a solution I really am clueless as to how to approach this.