1st law of thermodynamics, work/heat

FlipStyle1308

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

2. Relevant equations
adiabatic expansion: q = 0
deltaU = w = Cv (T2-T1)
reversible (ideal gas): P1V1 = P2V2
gamma = Cp/Cv
Cp - Cv = R

3. The attempt at a solution
V1 = nRT/P1
V2 = nRT/P2
Combine into w = -P2 (V2 - V1)

This is where I got stuck.

buffordboy23

Use the ideal gas law equation to find the temperatures first. Did you do this? What are the temperatures at states 1,2, and 3?

Similar Threads for: 1st law of thermodynamics, work/heat
Thread	Forum	Replies
work in mechanics vs. work in thermodynamics	Introductory Physics Homework	3
thermodynamics/heat question	Introductory Physics Homework	6
Thermodynamics--work, heat, & internal energy	Introductory Physics Homework	1
Heat and the First Law of Thermodynamics	Advanced Physics Homework	1

FlipStyle1308	1st law of thermodynamics, work/heat Tweet 1. The problem statement, all variables and given/known data 2. Relevant equations adiabatic expansion: q = 0 deltaU = w = Cv (T2-T1) reversible (ideal gas): P1V1 = P2V2 gamma = Cp/Cv Cp - Cv = R 3. The attempt at a solution V1 = nRT/P1 V2 = nRT/P2 Combine into w = -P2 (V2 - V1) This is where I got stuck.

buffordboy23	Use the ideal gas law equation to find the temperatures first. Did you do this? What are the temperatures at states 1,2, and 3?