Final answer:
The resultant couple moment when two forces of 3 and -70 are applied is 0.
Step-by-step explanation:
To determine the resultant couple moment, we need to calculate the moments of the individual forces and then add them together. The formula for the moment of a force about a point is M = r x F, where r is the position vector from the point to the line of action of the force, and F is the force vector.
In this case, we have two forces: 3 and -70. Assuming the point of calculation is at the origin (0, 0), the positions of the forces are 3 at (0, 0) and -70 at (-70, 0). The moments of these forces are 0 and 0, respectively. Therefore, the resultant couple moment is 0.