• Support PF! Buy your school textbooks, materials and every day products Here!

Pressure on a Piston

  • Thread starter eurekameh
  • Start date
  • #1
210
0
http://imageshack.us/photo/my-images/40/fdsfsadf.png/
So here's an image of a piston. First of all, this is for a thermodynamics class. Is thermodynamics considered to be "physics?" Do physics majors take thermodynamics?

So my question is: When writing the forces on the piston, it is obvious that we have the pressures acting on the piston from the gases in the chambers, and also a spring force on the second piston figure. I thought it was also obvious that there is Fg = mg acting on the piston as well. However, when I peeked at the solution manual, weight is not included in the force equation. Why is this?
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
5
Post the exact text of the problem.
 
  • #3
210
0
The piston diameters in Figure are D1 = 10 cm and D2 = 4 cm. When the pressure in chamber 2 is 2000 kPa and the pressure in chamber 3 is 700 kPa, what is the pressure in chamber 1, in kPa?
 

Related Threads for: Pressure on a Piston

  • Last Post
Replies
5
Views
473
  • Last Post
Replies
4
Views
19K
Replies
23
Views
1K
  • Last Post
Replies
6
Views
842
  • Last Post
Replies
4
Views
2K
Replies
1
Views
719
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
4
Views
4K
Top