Physics Help Forum Heat Engines

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Nov 23rd 2010, 05:25 PM   #1
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Heat Engines

Hello guys. This is my first time on physics help forum. I normally live on math help forum but that these kind of questions would be more suited for this forum. Any help would be great, thanks. I am totally lost.
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 Nov 30th 2010, 12:24 PM #2 Senior Member   Join Date: Jul 2009 Location: Kathu Posts: 131 Heat Engines For the first question, since the process is described as adiabatic, you can use the first and last points on the curve and solve for gamma. i.e. PV^(Gamma)=const. Solve for Gamma using points P0,V0 and P0/32,8V0. i.e 32*(1/8)^Gamma=1. (1/8)^Gamma=1/32. 8=2^3, 32 = 2^5 Therefor gamma must equal 5/3 the value of which means it is a monoatomic gas. If it was diatomic, gamma would be about 1.4 (7/5). Heat capacity can be expressed as f +2 / f where f is the amount of degrees of freedom of the gas molecule. Monoatomic gases have three degrees of freedom therefor gamma is 5/3.

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