Bennett Mechanical Comprehension Practice Test 2025 - Free Practice Questions and Review Guide.

To determine how many inches you must pull the rope down in order to lift the load by 28 inches, you need to understand the mechanical advantage of the system, typically related to pulleys or other lifting mechanisms.

In many lifting systems, particularly those involving pulleys, the distance you pull the rope down is often greater than the distance the load is lifted. This is due to the way mechanical advantage works. The basic principle is that to lift a load a certain distance, you must pull the rope a greater distance depending on the configuration of the pulley system or other mechanics involved.

In this case, if the load is lifted by 28 inches, and the total rope pull required is 56 inches, it follows the rule where the distance you pull (the effort distance) is double the distance the load moves (the load distance). This characteristic often appears in systems designed to increase efficiency, where a longer pull results in more gradual lifting of the load.

Thus, if pulling down 56 inches results in the load being lifted 28 inches, this reflects the necessary relationship between effort and load in this mechanical system. It describes how the effort distance relates directly to the load's displacement, affirming the principle of conservation of energy in mechanical systems.