If a machine requires an input of 6000 J of work to put out 5000 J of work, what is the machine's efficiency?
efficiency= output work/ input work x 100%
A.100%
B.83%
C.120%
D.40%
The machine's efficiency can be calculated using the formula:
efficiency = (output work / input work) x 100%
Given:
Input work = 6000 J
Output work = 5000 J
Substituting the values into the formula:
efficiency = (5000 J / 6000 J) x 100%
Calculating the division:
efficiency = 0.8333333333333333 x 100%
Converting the decimal to a percentage:
efficiency = 83.33%
Therefore, the machine's efficiency is approximately 83%. The correct answer is B.83%.