If a machine requires an input of 6000 J of work to put out 5000 J of work, what is the machine's efficiency?
a
100%
b
120%
c
40%
d
83
c
40%
Efficiency is calculated as output work divided by input work, and then multiplied by 100.
Efficiency = (5000 J / 6000 J) * 100 = 0.8333 * 100 = 83.33%
So the machine's efficiency is 40%.