Test Index

JAMB Physics 2018 Paper

Question : 41

Total: 87

Solution:

Concept:

Efficiency compares mechanical advantage to velocity ratio, so mechanical advantage equals velocity ratio times efficiency.

Explanation:

The system has

3

fixed pulleys and

2

movable pulleys.

Total number of pulleys

= 3 + 2 = 5

For this pulley system, velocity ratio

= 5

Efficiency is

72\% = 0.72

Mechanical advantage

= \text{Velocity ratio} \times \text{Efficiency}

MA = 5 \times 0.72 = 3.6

Answer:

3.6

Correct option: D

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