# Hydrostatic force on submerged curved surface

1. May 18, 2010

### febbie22

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

Hi i know how to do these problems but its calculating the weight of the fluid, which you have to do to minus it from the vertical force.

But in the solutions to the problem is say that the volume is R^2 - Pie *(R^2)/4 *1

The only thing i want to know is why is that the volume because ive never seen anything like it and if it is correct is it in all the problems so i can just remeber it.

Cheers

2. May 18, 2010

### tiny-tim

Hi febbie22!

(have a pi: π and try using the X2 tag just above the Reply box )

(and there's no way that R2 - πR2/4 can be a volume … it's obviously an area )

3. May 18, 2010

### febbie22

Hi its question 11-19, i triedto put it on word but it didnt let me upload. And ive got the solutions to the problem. and so when it says to calculate the weight it says

rowg * (R^2 - Pie * (R^2)/4 * 1

#### Attached Files:

• ###### Chapter 11.pdf
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4. May 18, 2010

### tiny-tim

I can't find that formula … which page is it on?

(and it's spelt rho, and you must have missed out an h … that's still an area!)

5. May 18, 2010

### febbie22

oh sorry it example 11-2 on page 494

and its the weight of fluid block per m length

that i dont get

6. May 18, 2010

### tiny-tim

I can't see a page 494 …

have you posted the correct document?