What does it mean to be financially responsible? It's a complex question with a complex answer, but at its core is a simple truth: To be financially responsible, you need to live within your means. And to live within your means, you must spend less than you make.
longitudinal axis. A straight line running fore and aft through the center of gravity. It is horizontal when the airplane is in the rigging position. The aircraft rolls about this axis. See axes.
Longitudinal wave-A longitudinal wave is a wave in which the motion of the medium is parallel to the motion of the wave. For example, with a longitudinal wave: Sound waves are longitudinal. The air vibrates back and forth along the same line that the wave is traveling down.