(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A cylinder/piston arrangement contains water at 105 C, 85% quality with a volume of 1L.

The system is heated, causing the piston to rise and encounter a linear spring. At this

point, the volume is 1.5 L, piston diameter is 150 mm, and spring constant is 100 N/mm.

The heating continues, so the piston compresses the spring. What is the cylinder

temperature when the pressure reaches 200 kPa.

2. Relevant equations

F/A=pressure

F=K*d

3. The attempt at a solution

From what I stated with. I solved for the Force on the spring.

F/(pi/4)(.150^2)mm=200,000 Pa

F=3534.29N

Then I found out the displacement of the spring.

3534.39=100*d

d=35.3439mm

That is where I am stuck at. What I tough might work is to find the volume after the spring is compressed. That is just over 1.5L and comparing that to the saturation tables it is above the saturated vapor. So it would be a gas. But I don't think that is correct. If anyone can help straighten me out and point me in the right direction. Thanks.

**Physics Forums - The Fusion of Science and Community**

# Thermodynamics-heating water in piston help

Have something to add?

- Similar discussions for: Thermodynamics-heating water in piston help

Loading...

**Physics Forums - The Fusion of Science and Community**