Calculate Suction Pressure from Walls & Cups

[bchohertz]

Hi, I had a question regarding pressure and suction.

Say you have 2 walls with a suction cup that is attached to each.
Initial volume of the cup is 1m^3, area attached is 1m^2
Initial pressure is 1 atm
Both walls have a hole of different sizes with a pipe leading out to atmosphere.
1 pipe is .25m area wide, other is .50m area wide.
How do I calculate how much suction pressure is being applied to each of these pipes?
assume the suction cups can infinantly exand out (think of an infinantly long piston), constant force of 1N pulling them out. Assume no friction, etc.

Thank you!

l
l
l------l
hole -----> l_____ ---> 1N
l l
l------l
l
l



l
l
l------l
HOLE -----> l_____ ---> 1N
-----> l
l------l
l
l

 

[chrisbaird]

Pressure is force per unit area. First calculate the cross-sectional area of the pipes.