The discussion revolves around a physics problem involving gas behavior in a cylinder, specifically focusing on how to calculate the new pressure after a piston is compressed. The context includes the ideal gas law and considerations of constant variables.
The discussion is active, with participants exploring different methods and questioning assumptions about the problem setup. Some guidance has been offered regarding the use of the ideal gas law and the importance of precision in measurements, but no consensus has been reached on the final answer.
Participants note that the temperature remains constant and express confusion over the precision of pressure measurements, which influences their calculations.
yopy said:I know how to setup the entire problem i just don't know how to calculate the new pressure after the piston is compressed.
LowlyPion said:PV = nRT
n, R, T remain the same. They give you everything else.
RoryP said:maybe p1v1/t1 = p2v2/t2 is more appropriate?
RoryP said:ok fair enough
just out of interest is the answer 234375 Pa?
No.RoryP said:just out of interest is the answer 234375 Pa?
mgb_phys said:No.
The volume goes from 0.750 -> 0.480 m^3, the pressure starts at 1.50 x10^5 Pa
so the final pressure is (0.750/0.480) * 1.50 x10^5 Pa = 2.34 x10^5 pa
You understand why your answer is wrong?
RoryP said:maybe p1v1/t1 = p2v2/t2 is more appropriate?
RoryP said:ahhh yes even more simple! forgot the temperature remained constant!
ok fair enough, would you be as kind enough to tell us the answer as i am revising for my physics A-level at the minute so all questions are useful!