# Homework Help: Carnot Engine Formula?

1. Apr 24, 2006

### brilyn

Is there a formula used to solve engine problems? For example a carnot engine is operated between two heat reservoirs at temperatures of 500K and 300K. If the engine receives 200 cal from the reservoir at 500K in each cycle. How many calories does it reject to the reservior at 300K?
This seems like it should be very easy but it's something we never went over in class. I know is receives more from the hot than it rejects so would I set up a proportional equation and take 200/500 then multiply by 300? this gives me 120cal... Let me know if i'm on the right track or if there is a formula to use Thanx

2. Apr 24, 2006

### MrJunkpile

I'm not sure if this will help but the thermal efficiency of a Carnot engine is $$1- T_c/T_h$$

Last edited: Apr 24, 2006
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