Question

A pulley system is used to lift a crate weighing 150 newtons straight up. If the force applied is 87 newtons and the ideal mechanical advantage of the pulley system is 2, what is the percentage efficiency of the pulley system?

Answer 1

150-87
63
63/2
31.5 is the answer.

Answer 2

86%

Step-by-step explanation:

Efficiency is the ratio of mechanical advantage to ideal mechanical advantage. Multiplying the ratio by 100 gives the percentage efficiency. So the answer is 86 percent.