(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

) An ideal monatomic gas is expanded from initial volume V1 = 1 L, P1 = 2 atm, and T1

= 300K to a volume V2 = 2 L and P2 = 1 atm. The expansion is performed along along a

straight line in the PV-diagram. It is then re-compressed isothermally to its original values

completing the cycle for a type of heat engine.

(a) Find the function P(V) describing the expansion.

(b) Find the function T (V) during the expansion.

(c) At which volume is the temperature a maximum Tmax and what is the volume Vm at this

maximum temperature, Tmax?

(d) What is the work done, the change in internal energy and the heat taken in during the

temperature increase T to Tmax?

(e) What are these values for the final part of the expansion Vm to V2?

(f) Find the efficiency.

2. Relevant equations

PV=nRT

3. The attempt at a solution

I am currently stuck on a) and b). I am not sure how to write a function for these, and what equation to use. I assume that we use PV=nRT to derive a function but I have no idea what to do. It would be really helpful if you could give me an example of a similar question where you have to derive an equation to get the function

Any help is appreciated.

Thanks!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Thermodynamics/ideal gas question

**Physics Forums | Science Articles, Homework Help, Discussion**