a force of 200N is inclined at an angle 120° to another force P. The angle between the 200N force and the resultant force is 50°. Find the magnitude of (a) force P (b) resultant of the two forces

Answer 1

sketch this on a force vector triangle. Be certain to do the 200N and P head to tail, and recompute the angle between (it is not 200) the head and tail of the other. Now use the law of sines.