Register to reply

How to calculate potential energy of water in a tank?

by fuzzylogic
Tags: energy, potential, tank, water
Share this thread:
fuzzylogic
#1
Sep13-10, 11:20 AM
P: 8
Suppose you have a cylindrical tank of water that is filled to height h. Total mass of water is M. How do you calculate the potential energy of water relative to the base of the tank?
Phys.Org News Partner Physics news on Phys.org
IHEP in China has ambitions for Higgs factory
The physics of lead guitar playing
The birth of topological spintronics
berkeman
#2
Sep13-10, 11:38 AM
Mentor
berkeman's Avatar
P: 40,649
Quote Quote by fuzzylogic View Post
Suppose you have a cylindrical tank of water that is filled to height h. Total mass of water is M. How do you calculate the potential energy of water relative to the base of the tank?
Welcome to the PF.

What is the context of the question? What do you intend to use the PE for?
fuzzylogic
#3
Sep13-10, 11:44 AM
P: 8
I just want to know what the stored p.e. is

berkeman
#4
Sep13-10, 11:54 AM
Mentor
berkeman's Avatar
P: 40,649
How to calculate potential energy of water in a tank?

Quote Quote by fuzzylogic View Post
I just want to know what the stored p.e. is
How come? And how did the water get into the tank? And where is it going to go as it flows out of the tank?

PE is relative to something, it is not an absolute quantity. It is valid to say that the stored PE of water in a tank is zero. And then if the water flows out to some other tank, there may be a change in the stored PE...
fuzzylogic
#5
Sep13-10, 03:00 PM
P: 8
does this make sense:
g=gravitational acc
y=water level from base
A=area of water surface
r=water density
m=total mass of water
U=PE

then dU=grAydy
U=1/2grAh^2=1/2mgh (m=rAh)
Doc Al
#6
Sep13-10, 03:04 PM
Mentor
Doc Al's Avatar
P: 41,300
Quote Quote by fuzzylogic View Post
does this make sense:
g=gravitational acc
y=water level from base
A=area of water surface
r=water density
m=total mass of water
U=PE

then dU=grAydy
U=1/2grAh^2=1/2mgh (m=rAh)
Yes, that's fine.


Register to reply

Related Discussions
Calculate the Gibb’s energy of the vaporization of 1 kg of water at 50° C and 1 bar. Introductory Physics Homework 0
Calculate the work to pump water out of tank Introductory Physics Homework 1
How to calculate the energy of the ice absorbs heat then becomes water General Physics 2
Water flow from Tank B to Tank C sizing questions Engineering Systems & Design 0
Potential Energy, Tank on Hill, water power generator downhill. Introductory Physics Homework 11