Question

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

Answer 1

Are you there?

Answer 2

yes

Answer 3

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

Answer 4

that will give you the work done...

Answer 5

seem reasonable?

Answer 6

delta U = Q-W

Answer 7

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

Answer 8

you know the conversions?

Answer 9

hello?

Answer 10

alright, i understood now. thanks a lot!

Answer 11

sure!

Answer 12

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

Answer 13

heh