The formula to calculate the Pulley Efficiency (Epull) is:
\[ \text{Epull} = \left( \frac{\text{WL}}{\text{AF}} \right) \times 100 \]
Where:
Let's say the weight lifted (WL) is 500 N and the force applied (AF) is 600 N. Using the formula:
\[ \text{Epull} = \left( \frac{500}{600} \right) \times 100 \approx 83.33 \, \% \]
So, the pulley efficiency (Epull) is approximately 83.33%.