- #1
danielbaker453
- 26
- 2
Homework Statement
A cylinder containing an ideal gas is in vertical position and has a piston of mass ##M## that is able to move up or down without friction (Fig. 13.2). If the temperature is increases,
(a) both ##p## and ##V## of the gas will change.
(b) only ##p## will increase according to Charles' Law.
(c) ##V## will change but not ##p##.
(d) ##p## will change but not ##V##.
Homework Equations
##pV=nRT##
##ΔU=q+w##[/B]
The Attempt at a Solution
The answer that is given is (c) and the reasoning is that the pressure (=Mg/A) is constant. But I don't get it. I think that the pressure of the gas will increase because as the temperature increases, the molecules will start hitting the walls of the container with greater speed causing an increase in pressure. Also as the temperature increases, the internal energy will increase and work will be done by the system on the piston thus lifting it up. This will cause an increase in volume. So, as the pressure and the volume are changing the correct answer would be (a).
Could someone please explain to me why I'm wrong?