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18 Dec 2019

An engine removes 350 J from a reservoir at 370 K and exhausts 300 J to a reservoir at 200 K.

(a) What is its efficiency?
%

(b) How much more work could be done if the engine were reversible?
J

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Jean Keeling
Jean KeelingLv2
31 Dec 2019

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Related questions

<p>You are a space explorer of an advanced (therefore alien) civilization. You travel through space with a novel propulsion system based on a perfect (reversible) heat engine. Your ship possesses an infinite heat sink (low temp reservoir) at a temperature of 6.6894 K. You propel your ship by capturing hot asteroids, sucking heat out of them, converting this heat to propulsion work, and expelling the asteriod. How much work (in J) can you obtain from the capture of an asteroid with a temperature of 87.950 K and a heat capacity of 74.259 J/K? <br />(Hint: As the asteroid cools, the efficiency of the engine decreases.) <br />Give your answer to at least four significant figures and do not use scientific notation<br />Answer: <br />Try to relate the differential work to the change in temperature of the asterioid and integrate over the temperature limits<br /><br />I know the correct answer is -4754.59 J, I just have no idea how that answer came about.</p>

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