As shown, three forces, F 1, F 2, and F 3, act at the same point on an object. (Figure 2) The point of application is the origin of a Cartesian coordinate system. F 1, which has a magnitude of F 1 = 16.5 kN, is in the y?z plane and is described by an angle ? 1 = 29.0 degrees. F 2is in the x ?z plane and is described by integer lengths of a similar right triangle; its magnitude is F 2 = 25.0 kN. If the sum of the forces is equal to zero, what is the magnitude of F 3?

F3 Z 13. 12 F B F