Final answer:
A. Hydraulic systems
Apparatuses such as backhoes use hydraulic systems to lift heavy loads, leveraging the principles of hydraulics for easier handling.
Step-by-step explanation:
To make the effort of loading LDH, many apparatuses are equipped with hydraulic systems.
Hydraulic systems are a critical component in heavy machinery like backhoes. These systems utilize incompressible fluid in a U-tube, with a movable piston on each side, allowing a small force applied over a small area to balance a much larger force over a larger area.
This principle is pivotal in lifting heavy loads, such as those lifted by hydraulic jacks used by auto mechanics to raise automobiles. In machinery like backhoes, the hydraulic system facilitates the lifting of significant weights, like a 400-kg load, leveraging the principles of hydraulics to make such tasks more manageable for operators.