Bennett Mechanical Comprehension Practice Test 2025 – The Complete All-in-One Guide to Exam Success!

In a combination pulley system, the length of rope that is pulled is directly related to the diameter of the pulley, denoted as D, and the number of load-supporting ropes, which affects the mechanical advantage provided by the system. Specifically, as the number of ropes that support the load increases, the effort needed to lift that load decreases, resulting in a shorter distance of rope being pulled compared to the distance the load is raised.

This relationship can be understood through the principles of mechanical advantage, where the effort required is inversely proportional to the number of supporting ropes. Thus, the formula for the length of rope pulled incorporates D, since it relates to the circumference of the pulley, and the number of load-supporting ropes. Understanding this relationship is crucial for solving problems related to pulley systems, as it demonstrates how these variables interact to influence the operation of the system.