The Walker family is building a cabin for vacationing. Mr. Walker and his son Terrell have erected a scaffold to stand on while they build the walls of the cabin. As they stand on the scaffold Terrell pulls on a rope attached to a support beam with a force of 400 newtons (N) at an angle of 65 with the horizontal. Mr. Walker pulls with a force of 600 newtons at an angle of 110 with the horizontal. What is the magnitude of the combined force they exert on the log?