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home / study / science / physics / questions and answers / an inventor claims to have developed a device with ... Your question has been answered Let us know if you got a helpful answer. Rate this answer Question: An inventor claims to have developed a device with... Bookmark an inventor claims to have developed a device with the following: net work output per cycle = 30,000 J heat output per cycle = 50,000 J high temperatures = 350 C lo temperature = 100 C a. calculate hte heat input per cycle b. is this a heat engine or a heat pump provide evidence for your assertion c. calculate the efficiency or coefficient of performance of the device d. deos this device obey the 2nd law of thermodynamics? prove your assertion with a calculation

Explanation / Answer

a)

heat input = heat output + work done

heat input = 50,000 + 30,000

heat input = 80,000 J

b)

this is a heat engine , since the temperature of sink where heat is rejected is lower as compared to temperature of the source.

c)

efficiency is given as

eff = 1 - To/Ti = 1- (100/350) = 0.714

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