Ok, I'm pretty sure now that
Q = V (p1 - p2)
and I agree with
U2 - U1 = cv T (m2 - m1) = ...which gives... = - (p1 - p2)(cv V)/R.
Folloving the same approach, I have calculated the work
----
dw = p dv multiplying with mass m
dW = m p dv = m p d( (RT)/p) = ( (pV)/(RT) )...
Thanks guys. I'm puting this on paper so I can check solutions. I have managed to do something on my own and I have found similar example in one book (this one is with p=const). I will check everything than post back.
See ya!
Homework Statement
Tank contain an ideal gas. Known is type of gas, temperature of gas T, volume of tank V=const, pressure of gas in tank p1, and the temperature of surrounding air T (same as temperature of gas in the tank). That is state 1.
Tank has small valve that was not closed...