A locomotive steam engine opperating with a total train mass of 99.9x10^6 kg climbs a hill of height 1000m in 10 minutes. If the steam engine produces steam at a temperature of 390k and exhausts steam at 300k, and if the engine were at the theoretically best efficiency possible, what would be the rate, in mass per unit time, at which the same is exhausted be?(adsbygoogle = window.adsbygoogle || []).push({});

I figured out the efficiency, and the work done by the try... I get the heat in, then use that to get the heat exhausted (I get 4.22x10^11 J for reference).. but then i'm stuck. It's more not really understanding the question than a physics then.. I just don't really know what to do with this, almost like I can't figure out how I should manipulate the units :yuck:

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# Homework Help: Problem on the second law of thermodynamics

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