If a machine has an efficiency of 94% and you apply 574J of work, how much work do you get out of the machine

539.56 Joules

Explanation: Efficiency of a machine is the ratio of work output to work input expressed as a percentage. Efficiency = (work output/work input) * 100% Efficiency of a machine is not 100% because so energy is lost due to friction of the moving parts and also as heat.

In this case;

Efficiency = 94%

Work input = 574 Joules

Therefore, Assuming work output is x

94% = (x/574 J) * 100%

0.94 = (x/574 J)

x = 539.56 J

Thus, you get work of 539.56 J from the machine