Heat Engine Carnot Efficiency question

  • #1

Homework Statement


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?


Homework Equations


(change in)U=Q-W
W=(change in)E
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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You need to post your attempt.

How does W and Q relate to the efficiency?
 
  • #3
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.
 
  • #4
Still stumped and don't know how to attack problem!
 
  • #5
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.
 
Last edited:
  • #6
rock.freak667
Homework Helper
6,230
31
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.
 

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