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
83%
c
120%
d
40%
The efficiency of a machine is given by the equation efficiency = useful output energy / input energy.
In this case, the useful output energy is 5000 J and the input energy is 6000 J.
Calculating the efficiency:
efficiency = (5000 J / 6000 J) * 100%
= 0.833 * 100%
= 83%
Therefore, the machine's efficiency is 83%.
The correct answer is (b) 83%.