Heat Engine Carnot Efficiency question

DrDonaldDuck

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

rock.freak667

You need to post your attempt.

How does W and Q relate to the efficiency?

DrDonaldDuck

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.

DrDonaldDuck

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

DrDonaldDuck

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.

rock.freak667

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.