- #71

erobz

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What formula?I appreciate your help. I didn't use P_{atm}L/(L -δ) = P_{atm}+ρg(h-δ) because

2nd degree equation was obtained ...

I have used the formula you suggested ...

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- Thread starter MatinSAR
- Start date

- #71

erobz

Gold Member

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What formula?I appreciate your help. I didn't use P_{atm}L/(L -δ) = P_{atm}+ρg(h-δ) because

2nd degree equation was obtained ...

I have used the formula you suggested ...

- #72

MatinSAR

- 163

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Thank you for you rhelp and time.Think about what h=0 physically corresponds to.

This post :What formula?

https://www.physicsforums.com/threa...-inverted-glass-in-water.1047903/post-6831524

- #73

erobz

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I don't understand! I solved it as a quadratic. However, your result indicates that my quadratic must be factorable I believe?Thank you for you rhelp and time.

This post :

https://www.physicsforums.com/threa...-inverted-glass-in-water.1047903/post-6831524

- #74

MatinSAR

- 163

- 54

Maybe I made a mistake ...I don't understand! I solved it as a quadratic. However, your result indicates that my quadratic must be factorable I believe?

was my answer correct ??

- #75

erobz

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It plots identically to my solution?Maybe I made a mistake ...

was my answer correct ??

- #76

MatinSAR

- 163

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Let me send you a picture of what I have done ...It plots identically to my solution?

- #77

MatinSAR

- 163

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My mistake is here :It plots identically to my solution?

So to find delta we have to solve a quadratic equation ...

The question only asked about the increase and decrease of F force, I didn't want to waste your time at all... I'm sorry...

edit :

I have solved that quadratic equation ...

Last edited:

- #78

erobz

Gold Member

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What you did on accident the first time by omitting ##\delta## was actually a really good approximation for ##\delta \ll h##. For the parameters I used I couldn’t tell the apart.My mistake is here :

View attachment 318768

So to find delta we have to solve a quadratic equation ...

The question only asked about the increase and decrease of F force, I didn't want to waste your time at all... I'm sorry...

edit :

View attachment 318770

I have solved that quadratic equation ...

- #79

erobz

Gold Member

- 1,921

- 868

I wanted you to explore it. It wasn’t a waste of my time at all!My mistake is here :

View attachment 318768

So to find delta we have to solve a quadratic equation ...

The question only asked about the increase and decrease of F force, I didn't want to waste your time at all... I'm sorry...

edit :

View attachment 318770

I have solved that quadratic equation ...

- #80

MatinSAR

- 163

- 54

Thank you for your help and time ... 🙏🙏I wanted you to explore it. It wasn’t a waste of my time at all!

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