Water pressure in a tank

1. Mar 8, 2010

ar202

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

A water pipe feeds a water tower with water. The tower is 15 metres tall.
If the water is to flow into the tank what is the minimum pressure of water at the bottom of the tower?
Assume litre of water = 1 kg
Assume 1 BAR = 1kg cm-2

2. Relevant equations

P = p g h ?

3. The attempt at a solution

am i using the correct equation...?

2. Mar 9, 2010

ar202

sooooooooo...

1000 * 9.81 * 15 = 147150 or 1.45 atmopspheres? :uhh:

3. Mar 9, 2010

pinsky

It doesn't matter if you use pascals or atmospheres. And the formula is correct.

4. Mar 9, 2010

ar202

ah okay, thanks. Is the answer correct?

5. Mar 9, 2010

pinsky

Either you didn't express yourself good enough or you're asking a stupid question. :)

6. Mar 9, 2010

ar202

hah

7. May 12, 2010

ar202

turns out i got this WRONG!!! any thoughts?!

8. May 16, 2010

lolrelativity

Apparently You had to count in air pressure (10^5 pascals) since it can still exert pressure on the bottom.....Is it correct with that added?

9. May 17, 2010

ar202

Yeah you're right, i didn't factor in surface pressure. doh!