# Fluid statics

1. Sep 3, 2009

### klezzie13

1. The problem statement, all variables and given/known data

Why must F2=P2(deltaA)(-j hat) and the opposing force be F1=P1(deltaA)(+j hat). Prove that these are the only two possibilities that are true.

2. Relevant equations

3. The attempt at a solution

2. Sep 3, 2009

### fluidistic

Could you provide the picture of the situation please? Or at least describe the situation with words.

3. Sep 3, 2009

### Redbelly98

Staff Emeritus
Welcome to PF klezzie13. In addition to explaining the problem better, you'll need to complete the Relevant equations and attempt at a solution portions of the homework template.

4. Sep 3, 2009

### klezzie13

you have a plane inside of a container of water. On the plane there is the force of gravity pointing downward. F2 must point downward and F1 must point upward. There is no acceleration within the system. F1,2≈ P1,2ΔA. Does that help?

5. Sep 3, 2009

### Redbelly98

Staff Emeritus
I think we need to see the figure.

6. Sep 3, 2009

### klezzie13

here it is. Its pretty simplistic but hopefully you get the point.

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7. Sep 4, 2009

### Redbelly98

Staff Emeritus
Okay. What equation do you know that relates force and pressure?

8. Sep 4, 2009

### klezzie13

F/A=p
F=Ap

I think I figured it out

9. Sep 4, 2009

### Redbelly98

Staff Emeritus
Yup, looks like you probably have