|Mar23-11, 09:52 PM||#1|
Hi, I have a couple of questions for my general knowledge because I have a test coming up and I'm confused on some stuff
1) For an isothermal process is the [tex]\Delta[/tex]S=0 because [tex]\Delta[/tex]T=0?
since it equals zero does that mean that the process is irreversible?
2)What makes a process reversible? is that when the [tex]\Delta[/tex]S>0?
3)In an adiabatic process, pV[tex]\gamma[/tex]=const. means that it equals a constant value not it is constant because if the temperature changes then the pressure and volume or one of them has to change right? But I dont understand how that is constant when Q=0, but then when [tex]\Delta[/tex]T=0, just PV is constant, wouldn't what I had earlier be constant at [tex]\Delta[/tex]T=0 too?
4) In an adiabatic process when I use piVi[tex]\gamma[/tex]=pfVf[tex]\gamma[/tex], means that I can just find the final pressure or the volume after the process occurs?
5)Similarly what does this mean? THVi[tex]\gamma[/tex]-1=TLVf[tex]\gamma[/tex]-1
and if I was only given the heat transfer QH and QL could I substitute that in for TH and TL?
6)In an Isochoric process, the volume is constant, so to find Q or [tex]\Delta[/tex]U, I can use either =nCv[tex]\Delta[/tex]T or =3/2nR[tex]\Delta[/tex]T?
7)In an Isobaric process, constant pressure, does [tex]\Delta[/tex]U=Q? Is this correct Q=mc[tex]\Delta[/tex]T or [tex]\Delta[/tex]U=nCv[tex]\Delta[/tex]T? or do I use something with Cp like [tex]\Delta[/tex]U=nCp[tex]\Delta[/tex]T?
|Mar23-11, 11:49 PM||#2|
|Mar24-11, 09:23 AM||#3|
thanks that cleared up a lot!
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