Can Suction Lift a 20 Meter Water Column Without Exceeding Its Tensile Strength?

Namrata
Messages
1
Reaction score
0

Homework Statement



What suction (or negative pressure) is required to support a column of liquid 20 m high? Does this exceed the tensile strength of water?

Homework Equations



Bulk Modulus = (Change in Pressure/ (Change in Volume/Volume))
Pressure = Force / Area

The Attempt at a Solution



Tensile strength of water = 20 MPa

Pressure = Force / Area

Assume column has a diameter of 1 unit.
The surface area of this column is thus:

Circumference x Height of column + Area of top of column

= 62.83 + 0.79
=63.62 units2


 
Physics news on Phys.org
Do you know why water rises in a straw when you suck on it?
If you do, then assuming that you have an extremely long straw, can you calculate how high the water would rise if you had perfect vacuum (zero pressure) inside the straw?
 

Thread 'Initial conditions for orbits around a wormhole'

Hi, I had an exam and I completely messed up a problem. Especially one part which was necessary for the rest of the problem. Basically, I have a wormhole metric: $$(ds)^2 = -(dt)^2 + (dr)^2 + (r^2 + b^2)( (d\theta)^2 + sin^2 \theta (d\phi)^2 )$$ Where ##b=1## with an orbit only in the equatorial plane. We also know from the question that the orbit must satisfy this relationship: $$\varepsilon = \frac{1}{2} (\frac{dr}{d\tau})^2 + V_{eff}(r)$$ Ultimately, I was tasked to find the initial...
View full post »

Thread 'Help to convert units of a simple formula'

The value of H equals ## 10^{3}## in natural units, According to : https://en.wikipedia.org/wiki/Natural_units, ## t \sim 10^{-21} sec = 10^{21} Hz ##, and since ## \text{GeV} \sim 10^{24} \text{Hz } ##, ## GeV \sim 10^{24} \times 10^{-21} = 10^3 ## in natural units. So is this conversion correct? Also in the above formula, can I convert H to that natural units , since it’s a constant, while keeping k in Hz ?
View full post »

Similar threads

A fluid mechanics problem -- Shape of a falling water drop
Replies
8
Views
3K
Fluid dynamics, friction and pressure
Replies
2
Views
3K
Diameter of hole vs time to submerge
Replies
8
Views
3K
Calculating Speed and Force in Water Jet Impact | Fluid Mechanics Homework
Replies
1
Views
2K
Sink time of a cap with varying hole diameters
Replies
21
Views
9K
Atmospheric humidity for water production.
Replies
3
Views
3K
Fluid mechanics conservation of momentum problem
Replies
3
Views
7K
Intro Fluid Dynamics homework question
Replies
3
Views
3K
Can someone please check my homework on fluid dynamics?
Replies
11
Views
3K
What is the force exerted by the water on the bottom of the tank?
Replies
13
Views
5K

Hot Threads

Recent Insights

Back
Top