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Carnot Heat Engine

  • Thread starter tehjojo
  • Start date
  • #1
2
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Homework Statement



Consider a Carnot engine that operates between a hot reservoir at 63°C and a cold reservoir at -14°C. In running 25 minutes, this engine absorbs 590 J of heat from the hot reservoir.

How much heat does it expel to the cold reservoir?

Homework Equations


[tex]Q_H/Q_C = T_H/T_C[/tex]

The Attempt at a Solution


[tex]T_H = 336k[/tex]
[tex]T_C = 287k[/tex]
[tex]Q_H/Q_C = T_H/T_C \longrightarrow 590/Q_C = 336/287[/tex]
Solving for [tex]Q_C[/tex] I get 504 J, however, this is not the correct answer. What am I missing?
 

Answers and Replies

  • #2
374
1
Are you sure Tc= 287 K? The cold reservoir is at -14 C
 
  • #3
2
0
Wow. It happened that on the site my homework is on, the negative sign and the number were on different lines, so I totally missed it. Thank you very much.
 

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