# Hydrostatic force on submerged curved surface

## Homework Statement

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

tiny-tim
Homework Helper
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 )

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

#### Attachments

• Chapter 11.pdf
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tiny-tim
Homework Helper
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

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!)

oh sorry it example 11-2 on page 494

and its the weight of fluid block per m length

that i dont get

tiny-tim