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March 30, 2015

March 30, 2015

Posted by **Dan** on Monday, December 6, 2010 at 5:47pm.

- physics -
**Lalala**, Thursday, February 10, 2011 at 6:34pmEquations you will need:

Q = mc deltaT

e = 1 - (Qc/Qh)

The first thing you need to realize is that when you're calculating Q it's Qc, because that is the heat going into the water and therefore out of the power station. So then you can plug that into e = 1- (Qc/Qh) and solve for Qh.

That isn't the answer yet, though, because it isn't asking how much heat the engine uses (input heat is Qh). It's asking how much total energy it can produce.

And now it's very simple because you know Qh, the total heat it uses, and you know the efficiency, the amount of that heat that can be used to do work. So you multiply Qh by the efficiency and THAT's the answer.

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