V1=0.001 м3 p1=10^5 Па V2=3*V1 p2=3*p1 i=5 A=? Qн=? η=?
===
A=(p2-p1)*(V2-V1)/2=2*p1*2*V1=4*10^5*0.001=400 Дж
Qн=ΔU+A=(i/2)*v*R*ΔT+A=(i/2)*(p2*V2-p1*V1)+A=(i/2)*8*p1*V1+A=
=(5/2)*8*10*5*0.001+400=2400 Дж
η=A/Qн=400/2400≈0,17 (17%)
==================================