## anonymous 4 years ago help please! i don't know how to use the pressure volume relation in this problem. A fluid system undergoes a nonflow frictionless process following the pressure volume relation as P = (5/V) + 1.5 where P is in bar and V is in m3. During the process the volume changes from 0.15 m3 to 0.05 m3 and the system rejects 45 kJ of heat. Determine: A] change in internal energy B] change in enthalpy

1. anonymous

Are you there?

2. anonymous

yes

3. anonymous

first find:$\int\limits_{.15}^{.05} (\frac{ 5 }{ V } +1.5)dV$

4. anonymous

that will give you the work done...

5. anonymous

seem reasonable?

6. anonymous

delta U = Q-W

7. anonymous

they give you Q so if you have W you know change in internal energy

8. anonymous

you know the conversions?

9. anonymous

hello?

10. anonymous

alright, i understood now. thanks a lot!

11. anonymous

sure!

12. anonymous

oooooh. really really really thank you. i thought i'm just going to substitue the v's. lol

13. anonymous

heh