carlota does 2000 j of work on a machine. the machine does 500 j of work. what is the efficiency of the…
carlota does 2000 j of work on a machine. the machine does 500 j of work. what is the efficiency of the machine?\n4%\n25%\n75%\n400%
Answer
Explanation:
Step1: Recall efficiency formula
Efficiency $\eta=\frac{\text{useful work output}}{\text{total work input}}\times100%$
Step2: Identify values
The useful work output of the machine is $W_{out}=500\ J$ and the total work input is $W_{in} = 2000\ J$.
Step3: Calculate efficiency
$\eta=\frac{500}{2000}\times 100%$ $=\frac{1}{4}\times100% = 25%$
Answer:
B. 25%