What is the efficiency of a device that takes 400J of heat and does 120J of work while giving off 280 J of heat

asked Oct 22, 2021 46.4k views

2 votes

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3 votes

Answer:

30%

Step-by-step explanation:

Efficiency = useful work / heat absorbed x 100

= 120/400 x 100

= 0.3 x 100

= 30%

Iiro answered Oct 27, 2021

by Iiro

8.1k points

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