Homework Help: Water pressure-displacament

1. May 8, 2008

alibaba2

hi...
i have this question:
what would be the force in kilograms to press the entire volume of water from the container up the pipe at 30ft. ( some of the water will remain in the pipe of course).

see image:

img374.imageshack.us/my.php?image=graphic1qh8.jpg

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

2. Relevant equations

3. The attempt at a solution

2. May 9, 2008

anybody??

anybody???

3. May 9, 2008

tiny-tim

Hi alibaba2!

(I assume the pipe is open at the top, so the water just spills out and disappears.)

You need to calculate the force needed to lift a 2 ft cube of water to the top of a 30 foot pipe.

So the formula you should use is … ?

4. May 9, 2008

alibaba2

help

no idea whatsoever........i had the formula written down,but i can't access my notes from my current location....

any help tim????

10x

5. May 9, 2008

tiny-tim

Well, what principle do you think would help … energy? … momentum? … work? … something else?

Hint: how much force is needed to raise a one-cubic-foot bucket of water a height of one foot?