Need help ly

1. Mar 22, 2008

junec21

Question ...

1) 0.25 kg of combustion gas in a diesel engine cylinder is at temperature of 727°C. The gas expands at constant pressure until its volume is 1.8 times its original value. For the combustion gas, R = 0.302 kJ/kgK and Cp = 1.09 kJ/kgK. Find the following:
a) temperature of the gas after expansion
b) heat transferred
c) work transferred

2) A quantity of gas has an initial pressure and volume of 0.1 MN/m2 and 0.1 m3, respectively. It is compressed to a final pressure of 1.4 MN/m2 according to the law pV1'26 = constant. Determine the final volume of the gas.

Last edited: Mar 22, 2008
2. Mar 22, 2008

Hootenanny

Staff Emeritus
Hi Junec & welcome to PF,

What have you attempted thus far?

3. Mar 22, 2008

rock.freak667

a)If you know it expands at constant pressure....What does that mean for Volume and Temperature? (Check what Charles's law says about it)
b)What is the definition of $C_p$?
c) Do you know a formula for finding the Work done by a gas when it expands its volume at a constant pressure?