What three planes or directions are used to locate the center of gravity (CG) of a solid object?

The center of gravity (CG) of a solid object is determined by considering its mass distribution in three-dimensional space. The correct answer identifies the three planes or directions essential for this calculation: the X axis, Y axis, and Z axis.

The X axis typically represents width, the Y axis represents depth, and the Z axis represents height. By analyzing the mass distribution along these three axes, one can accurately pinpoint the CG, which is crucial for assessing stability, balance, and weight distribution in various engineering and rescue applications.

In this context, the other options do not correctly encompass the standard Cartesian coordinate system used in physics and engineering. For instance, the W axis is not a recognized standard for this purpose, and the Height axis does not provide enough differentiation since it essentially refers to the Z axis but lacks the specificity needed. Similarly, referring to the Horizontal and Vertical axes introduces ambiguity, as these terms are often used in two-dimensional contexts rather than the three-dimensional space required for determining CG. Therefore, the X, Y, and Z axes are the correct and universally accepted directions for locating the center of gravity of a solid object.