# Homework Help: Help me plss

1. Oct 1, 2009

### iarheim

Help me plss!!!!

1. The problem statement, all variables and given/known data
A cycle, composed of 3 process, is polytropic compression(n=1.5)from 137 kpa and 38 degree to state 2, constant pressure from state 2 to state 3, and constant volume from state 3 and to state 1. The heat rejected is 1560 kJ/kg, and the substance is air. Determine a.pressures, temperature and specific volumes around the cycles: b. the heat added; c. the heat rejected; d. the work for each process.

2. Relevant equations

3. The attempt at a solution

2. Oct 1, 2009

### Staff: Mentor

Re: Help me plss!!!!

Welcome to the PF. Please fill out the rest of the template with the Relevant Equations and show us your attempt at a solution. We do not do your homework for you here.

3. Oct 3, 2009

### iarheim

Help me plss!!!!

1. The problem statement, all variables and given/known data
A cycle, composed of 3 process, is polytropic compression(n=1.5)from 137 kpa and 38 degree to state 2, constant pressure from state 2 to state 3, and constant volume from state 3 and to state 1. The heat rejected is 1560 kJ/kg, and the substance is air. Determine a.pressures, temperature and specific volumes around the cycles: b. the heat added; c. the heat rejected; d. the work for each process.

2. Relevant equations
for state 1-2
P1V2^n = P1V2^n
for state 2-3
V2/ T2 = V3 / T3
for state 3-1
P3 / T3 = P1 / P1

3. The attempt at a solution

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