Final answer:
The lines outside of the aircraft in the hover mode on the MFD represent airspeed in knots. The motion of the velocity bars on the MFD is limited to a specific number of knots.
Step-by-step explanation:
The MFD (Multi-Function Display) in an aircraft has lines outside of the aircraft in the hover mode that represent the airspeed of the aircraft. Each line represents a certain number of knots, which is a unit of speed used in aviation. The exact number of knots represented by each line will depend on the specific aircraft and its settings.
The motion of the velocity bars, represented by magenta crosshairs, in the MFD is limited to a certain number of knots. This limit is determined by the aircraft's specifications and capabilities. It is important to refer to the aircraft's documentation or consult with the aircraft manufacturer for the specific limit.