Recent content by blue89

so basicllay when its adiabatic, and this is a close system we have DeltaU=Q-w but Q=0 and we have W in positive becase the pump is working on system. so it is reviersibel?? or ireversible? if its reversible we have pv^r= constant so then how can we find the Tf? if we have Pf but about p...

i was just confused which equation should i use? is V really constant or we have change of volume equal to 0.6?initially tire is in vaccum(Po=o psia).work is done by pump,but how we should apply pressure of pump and its temp. in our equations?

from the notes i know its adiabatic, and when we pumping the air quickly therefore its getting adiabatic and the pressure of system and surrounding are not same so its also ireversible. to find delta U we can use delaU=ncvdelta T but when its asking to find final temperature , it mean...

pump add air into the flat tire in the gas station. The compressed air is at 180 psia and 60F(+460). the tire is initially at vaccum, therefore p0=0 psia. Air is added into the tire until it reaches Pf =32.9 psig which is (23.9+14.7=47.6 psia), then stopped . this process is adiobatic which...