Thermodynamics B/C

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Riptide
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Re: Thermodynamics B/C

Post by Riptide »

TheChiScientist wrote:At what temperature are Celsius and Fahrenheit the same?
-40
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Re: Thermodynamics B/C

Post by TheChiScientist »

Riptide wrote:
TheChiScientist wrote:At what temperature are Celsius and Fahrenheit the same?
-40
Correct! 
If you don't know that of the top of your head I would recommend you do that.
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Re: Thermodynamics B/C

Post by TheChiScientist »

Aw great. Somebody get the defibrillator! Don't die on me Thermo!! :cry: Clear! :| Yay Thermo lives! :) Anyways onto the next question...

Write out Newton's law of cooling and label each variable.
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Re: Thermodynamics B/C

Post by UTF-8 U+6211 U+662F »

TheChiScientist wrote:Aw great. Somebody get the defibrillator! Don't die on me Thermo!! :cry: Clear! :| Yay Thermo lives! :) Anyways onto the next question...

Write out Newton's law of cooling and label each variable.
, where  is the rate of heat transfer,  is a constant,  is the area, and  is the difference in temperature at time
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Re: Thermodynamics B/C

Post by TheChiScientist »

That is correct! Your turn. :P
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Re: Thermodynamics B/C

Post by UTF-8 U+6211 U+662F »

Nice history question from my states test last year:

Describe three different scientists' formulations of the Second Law.
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Re: Thermodynamics B/C

Post by Jacobi »

UTF-8 U+6211 U+662F wrote:Nice history question from my states test last year:

Describe three different scientists' formulations of the Second Law.
Carnot: A Carnot heat engine is most efficient.  
Kelvin: Heat cannot be converted to work at 100% efficiency.
Clausius: Heat doesn't go from cold to hot spontaneously.
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Re: Thermodynamics B/C

Post by UTF-8 U+6211 U+662F »

Jacobi wrote:
UTF-8 U+6211 U+662F wrote:Nice history question from my states test last year:

Describe three different scientists' formulations of the Second Law.
Carnot: A Carnot heat engine is most efficient.  
Kelvin: Heat cannot be converted to work at 100% efficiency.
Clausius: Heat doesn't go from cold to hot spontaneously.
Yep! 
Carnot's theorem is that no heat engine is more efficient than the Carnot heat engine [i]between the same reservoirs[/i] (a bit of a nitpick).
Kelvin's is usually called the Kelvin-Planck statement.
Your turn!
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Re: Thermodynamics B/C

Post by Jacobi »

What is the equation for the efficiency of a Carnot heat engine?
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Re: Thermodynamics B/C

Post by UTF-8 U+6211 U+662F »

Jacobi wrote:What is the equation for the efficiency of a Carnot heat engine?
?
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