Question

If a machine requires an output of 5,000 joules of work to put out 4,000joules of work, what is the machines efficieny? (Hint: the formula for efficiency is below):
Efficiency= Output work/
/Input work X 100%

Answers:
100%
40%
80%
60%

Answer 1

Answer:

The  machines efficiency is 80% .

Step-by-step explanation:

Formula

$Efficiency = \frac{W_{out}\times 100}{W_{in}}$

Where $W_{out}$ represented the output work .

$W_{in}$ represented the input work .

As given

If a machine input of 5,000 joules of work to put out 4,000 joules of work .

Input work = 5000 joules

Output work = 4000 joules

Putting the values in the formula

$Efficiency = \frac{4000\times 100}{5000}$

$Efficiency = \frac{400000}{5000}$

Efficiency = 80%

Therefore the  machines efficiency is 80% .