A. 100N
B. 90N
C. 80N
D. 120N
Correct Answer:
Option A – 100N
What effort will a machine of efficiency 90% apply to a load of 180N if its efforts arm is twice as long as its load arm?
![A load of mass 120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms‾²]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A load of mass 120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms‾²]")
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