Question

Ethan is using a machine to mix cement. The work input is 10 and the work output is 8. What is the efficiency of the
machine?

Answer 1

Efficiency or $\eta$ is calculated by formula: $\eta=\frac{W_{output}}{W_{input}}$ where $\eta\leq1$ also efficiency has no unit.

Now put in the data and calculate the efficiency.

$\eta=\frac{8}{10}=\boxed{0.8}$

The efficiency of the machine is 0.8

If you want to get percentage just multiply by 100 and you get 80%

Hope this helps.

r3t40