Physics Help Forum closed system. help !

 Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

 Jan 16th 2018, 09:04 AM #1 Junior Member   Join Date: Jan 2018 Location: shropshire Posts: 1 closed system. help ! I'm very new here, please forgive me for bringing what i hope is a begginers question to an advanced thermo forum, but i've asked in several other places and not found a sensible answer In a given closed system ( ie heat and work can cross the system boundary, mass cannot ) a process occurs such that delta U=0 (no change in internal energy) delta H=0 (no change in enthalpy) delta W=0 (no work crosses the system boundary ) Q is positive (heat enters the system ) Is this possible ? i believe it is not, but if i am wrong, what sort of process might it be
 Jan 16th 2018, 11:54 AM #2 Forum Admin     Join Date: Apr 2008 Location: On the dance floor, baby! Posts: 2,858 Moved to Thermodynamics and Fluid Mechanics forum. -Dan __________________ Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup. See the forum rules here.
 Sep 17th 2018, 06:31 PM #3 Member     Join Date: Sep 2014 Location: Brasília, DF - Brazil Posts: 32 You can work in this problem using the entropy definition. The second law requires that entropy production be positive or zero. By contrast, the change in entropy of the system may be positive, negative, or zero.

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