- #1
Sirsh
- 267
- 10
I keep getting this question wrong, and I am struggling to understand why this is.
F = p*A
Ap = π*r2
Denoting patm as atmospheric force, and p0 as pressure inside the cylinder.
Firstly, a force balance on the system. Force UP = Force DOWN.
p0*Ap = m*g + patm*Ap
patm = 101.4 kPa , and at 104.4°C p0 is equal to a pressure between 110 kPa (at 102.3°C) and 120 kPa (at 104.8°C).
By interpolation p0 is equal to 118.4 kPa.
Rearranging the force balance, m = ((p0-patm)*Ap)/g = ((118.4-101.4)*(π*(0.042)2)/9.81 = 0.00960 kg.
This seems like a VERY unrealistic situation considering this very small mass is creating 17 kN/m2 of force..
Any help would be appreciated.
Homework Statement
Homework Equations
F = p*A
Ap = π*r2
The Attempt at a Solution
Denoting patm as atmospheric force, and p0 as pressure inside the cylinder.
Firstly, a force balance on the system. Force UP = Force DOWN.
p0*Ap = m*g + patm*Ap
patm = 101.4 kPa , and at 104.4°C p0 is equal to a pressure between 110 kPa (at 102.3°C) and 120 kPa (at 104.8°C).
By interpolation p0 is equal to 118.4 kPa.
Rearranging the force balance, m = ((p0-patm)*Ap)/g = ((118.4-101.4)*(π*(0.042)2)/9.81 = 0.00960 kg.
This seems like a VERY unrealistic situation considering this very small mass is creating 17 kN/m2 of force..
Any help would be appreciated.