Final answer:
To determine the magnitude of the moment produced by a force about the point A, calculate the torque using the formula t = rF sin θ.
Step-by-step explanation:
To determine the magnitude of the moment produced by a force about the point A, we need to calculate the torque.
Torque is given by the formula t = rF sin θ, where r is the perpendicular distance between the force and the point of rotation, F is the magnitude of the force, and θ is the angle between the force and the lever arm.
In this case, the torque is found to be 375 N·m.