Welcome to PHY 121 Blog Help. Here's how it works. For each homework question and lab report we will make a post, this will probably contain a few tips on what the problems are about and how to solve them. If you are stuck on something then instead of emailing us directly you should post a comment in reply to the relevant post. We will try to guide you through tough points and help you understand the problems and the concepts behind them.
Sunday, November 14, 2010
Ch 12_2 #4
This is a constant temperature process for an ideal gas.
Pay attention to what the question asks. Its asking You what the Ratio is for total pressure. But total pressure is not provided in each case - instead you are given GAUGE pressure.
If you do the algebra, the equation turns out to be Vnew/ Vold = Pold/Pnew.
In my problem The change occured from 1.1 atm to 0 Atm. Since this is gauge pressure, we know that we need to add 1 atm to both numbers (since that is not included in the total pressure).... So the answer would be (1.1+1) / (0+1) = 2.1
7 comments:
im not sure what to do here
This is really confusing. Can someone please post something helpful?
this question makes no sense if the pressure is reduced to 0 atm, then the entire thing would be 0...and so would the ratio?
Pay attention to what the question asks. Its asking You what the Ratio is for total pressure. But total pressure is not provided in each case - instead you are given GAUGE pressure.
If you do the algebra, the equation turns out to be Vnew/ Vold = Pold/Pnew.
In my problem The change occured from 1.1 atm to 0 Atm. Since this is gauge pressure, we know that we need to add 1 atm to both numbers (since that is not included in the total pressure).... So the answer would be (1.1+1) / (0+1) = 2.1
Good luck.
ty
thanks soo much
Excellent explanation
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