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. 40%
b. 100%
c. 83%
d. 120%
The efficiency of a machine is given by the equation:
efficiency = (output work / input work) * 100%
In this case, the output work is 5000 J and the input work is 6000 J. Plugging these values into the equation, we get:
efficiency = (5000 J / 6000 J) * 100%
= 0.8333 * 100%
= 83.33%
Therefore, the machine's efficiency is approximately 83%, which corresponds to option c.