What is the general guideline for the relationship between weight and arm in determining moment?

The relationship between weight and arm in determining moment is expressed by the formula that defines moment as the product of weight and arm. In aviation, the term "moment" refers to the rotational effect produced by a weight acting at a specified distance from a reference point (usually the aircraft's center of gravity). This is mathematically expressed as:

Moment = Weight × Arm

In this context, "weight" represents the force due to gravity acting on an object, while "arm" refers to the horizontal distance from the center of gravity or reference point to where the weight is applied. This formula is essential for aircraft weight and balance calculations because it helps determine the overall stability and performance of the aircraft during flight.

By understanding this relationship, pilots can make informed decisions regarding load distribution and ensure that the aircraft remains within safe operating limits. This makes option C the correct choice as it accurately reflects the fundamental principle behind calculating moments in aviation.