# Truck cylinder, ideal gas law problem

1. Feb 24, 2009

### Flip18064

1. The problem statement, all variables and given/known data

One cylinder in the diesel engine of a truck has an initial volume of 500 cm^3. Air is admitted to the cylinder at 30 C and a pressure of 1.0 atm. The piston rod then does 450 J of work to rapidly compress the air. What is its final temperature? What is its final volume?

2. Relevant equations

PV = nRT
$$\Delta$$ Eth = (5/2)nR$$\Delta$$T

3. The attempt at a solution

I found the temperature using the second equation to be 1100 C which is right. However i cannot find the final volume for the life of me. I tried P$$\gamma - 1$$T-$$\gamma$$ and use the final pressure to find the volume but that didn't seem to work. Is there another way to go about this?

2. Feb 24, 2009

### Flip18064

finally figured it out using the formula:

W = PV$$\gamma$$(Vf1-$$\gamma$$ - Vi1-$$\gamma$$)/(1 - $$\gamma$$)