By using a pulley system, a farmer makes it easier to lift bales of hay by reducing the force needed. The energy she uses to complete the task is 10,000 joules, and the work done on the bales of hay is 8,000 joules. What was her efficiency in this task? (1 point)

Question

Responses

2,000 joules
2,000 joules
125%
125%
80%
80%
18,000 joules

Answer 1

The efficiency of the task can be calculated by dividing the work output by the energy input and multiplying by 100 to get a percentage.

Efficiency = (Work output / Energy input) x 100

Efficiency = (8,000 / 10,000) x 100
Efficiency = 0.8 x 100
Efficiency = 80%

Therefore, the farmer's efficiency in this task was 80%.

Correct Answer: 80%