## Heat Engine Carnot Efficiency question

1. The problem statement, all variables and given/known data
A heat engine has a carnot efficiency of 0.11. How much internal energy does this engine use in order to do 5.1 x 10^4 joules of work? How much heat does this engine give off/exhaust?

2. Relevant equations
(change in)U=Q-W
W=(change in)E

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 Recognitions: Homework Help You need to post your attempt. How does W and Q relate to the efficiency?

 Quote by rock.freak667 You need to post your attempt. How does W and Q relate to the efficiency?
W is the work done and Q is the heat generated. U is the total internal energy. No idea how to do this, hence my non-existent attempt.

## Heat Engine Carnot Efficiency question

Still stumped and don't know how to attack problem!

 Someone PLEASE help?!!?!?!?!? Growing very desperate here. EDIT: I think I got it. Internal energy=412636J, exhaust heat is the same. So sleepy, please confirm.
 Recognitions: Homework Help Look up 'thermal efficiency', that will tell you how Q and W are related to the efficiency n. When you know that you can get the value of Q and subsquently U.