Liquid Definition and 990 Threads

Homework Statement A U-tube has vertical arms of radii r and 2r, connected by a horizontal tube of length l whose radius increases linearly from r to 2r. The U-tube contains liquid up to a height h in each arm. The liquid is set oscillating, and at a given instant the liquid in the narrower...

I have a enclosed system for cooling bearing housings with oil. I need to calculate the rough pressure that will be produced when the oil pump is switched on. The oil will be pumped from a small tank, through the system and back into the tank. Pipe diameter = 10.8mm Pipe length = aprox 2m...

Note: this is not a homework question; this is strictly conceptual in understanding the equations at work in this scenario. The tank is vacuum-insulated, the liquid is saturated, and the vents have just been opened in order to vent down the ullage pressure. My question is simply how do you...

Homework Statement A tube of length L=1 m closed at its upper end is immerged vertically, with its openend, in water by a distance l=27 cm. The atmospherical pressure is the normal one. Find the length of the water column that enters the tube. Consider the process isothermal. Homework...

Homework Statement This is more of a conceptual question rather than a homework problem. This is my first post, so apologies if this is in the wrong section. Consider a jar full of liquid in microgravity. My book says: According to the formula p = ρgh, p→0 as g→0. Thus there is no...

i have been studying pressure and hydrostatics and i stumbled upon this now imagine a container filled with water , and there is a cube in the water now i know that the weight of the displaced water = the upthrust force but what bothers me is , how is the water pressure at a certain level...

A magnet only attract ferromagnetic material because they have magnetic domains which will align to form magnetic dipole when external magnetic field applied. Paramagnet don't have domains. Due to the presence of some unpaired electron, they will cause the realignment of the electron path when...

This seems to be a relatively simple question, yet I'm not sure of the answer. A balloon filled with helium gas floats in air. If I submerged a balloon or container in a liquid (e.g. water), is there a liquid with which I can fill the container so as to make it float to the surface. What kind...

I was digging a trench next to a building today so rain water would not back up to the buildings wall. Most of the material was soil but there were some large chunks of concrete. The largest chunk of concrete that was too heavy to move was pryed up and supported on the left and right sides with...

Dear all fellow physicists, I am struggling with the following fluid mechanics problem: considering a liquid film in an "equilibrium" position between two plane walls, I am trying to define the forces acting on the liquid. Most importantly, gravity is pulling down on the liquid with Fg = m* g...

is it because that pressure in liquid acts in all directions?

Homework Statement Two cylinder shaped vessels of cross section A are fixed vertically to a trolley, which was initially at rest. The two vessels are connected with a thin horizontal tube which is equipped with a tap. The distance between the axes of the vessels is L. The vessel in the left...

So, Liquid Nitrogen or Liquid Helium to cool Type I(Lead/Aluminum) superconductor? I know its best to use Liquid Helium, but can I use Liquid Nitrogen and go below the BC of those materials?

My friend and I are trying to design a simple liquid-cooled heat exchanger and I'm getting some odd results so I wanted to get another set of eyes on my math here. We're running four 1.5m sections of nylon tube in parallel through the heat source, which was a thermal input of 265W. The cooling...

Homework Statement A block has a density of 8.90 g/cm^3 and has an apparent mass of 120g in water and 116g when submerged in a liquid. What is the density of the liquid?Homework Equations m/(m-mapparent) = p/pliquidThe Attempt at a Solution Nevermind.

Homework Statement Homework Equations The Attempt at a Solution Honestly, I don't have any idea on this. As far as I remember, the usual practice is to equate the excess pressure equal to ##2T/R## (where T is the surface tension and R is the radius of curvature, this may be wrong...

I had a question about the volume of vapor produced from an amount of liquid after increasing the pressure inside a container containing the liquid, then rapidly decreasing it back to the original pressure. Say you have an amount of water, say 1mL (or another liquid, not sure what descriptors...

Since my high school days, I learned that glass is a liquid. (Science naive students thought glass is solid, and the smarty pants knew it was actually a liquid:) Yesterday, while I was telling this interesting fact to my daughter, my wife argued that glass is solid. I googled to explain them why...

it seems that there is no definite proof in experiment ?

Hi! So I'm a bit confused: first off, does Fermi liquid theory have "order". I suppose it depends on how you define order. But in case it does, is it described by symmetry breaking? From what I read, I think it does have order which is not described by symmetry breaking. But then I have...

I have one question about optics because I start interested in it. If an object is placed a distance p from a thin glass lens (index of refraction n), we can see its image on a screen that is placed a distance d from the lens. Do you know any formula which can describe this situacion? I found...

Homework Statement A tank is filled to the depth h1 with a liquid with mass density p Over the liquid surface is an atmospheric pressure po. From the bottom of the tank there`s a tube with cross-sectional area of ​​S. Tube expands to double cross-sectional area 2S while bending up to the...

Hey all, For a school project, I am trying to design a pad (placed on the floor) which can detect liquid and make a loud buzzing sound immediately upon the detection of the liquids. Any ideas?

Homework Statement Saturated liquid CO2 is at T= 293 K and P=5.72*10^6 Pa and undergoes throttling to P=1.01*10^5. The resulting solid and vapor mixture is at T = 195 K. What fraction of the carbon dioxide is vaporized? (The enthalpy of the saturated liquid in the initial state is 24,200...

Hello, recently saw video demonstrating newly developed armor based on non Newtonian liquid. Such armor is being still researched but is very promising, flexible, lightweight and can stop even heavy stabs with sharp pricker, maybe even bullets. Liquid armor itself is based on two components -...

Is there a way to create visible/"liquid" energy? Probably a more low-brow topic than you're used to but I have plenty of gadgets, materials and tools at my disposal and I wish to improve the quality of some replicas I've made. A common denominator of any sci-fi gizmo is the glowing energy...

I remember seeing a liquid that changes color when you shake it and then changes back to it's original color when it settles. Does anyone know what reaction this is? I would like to do it for a school project. Also, does this last forever, or will it eventually stop? If this does not work, does...

I have a liquid that is stored at pressure. This liquid is then released to a lower pressure where it should become a gas. The problem is how long does it take for the liquid to turn to gas. There must be some delay - even a very small one - but how to calculate it. Example - a jet of...

Hi, I brew beer and part of the process is measuring the specific gravity of the fermenting liquid. This is done visually using a hydrometer. Digital hydrometers are available and very expensive. I'm trying to come up with a way to measure the liquid specific gravity electronically. Typical...

Hi All, I'm wondering if anyone is aware of a piezoelectric material that is both liquid and is transparent/colorless/ lower refractive index? Is there database online where I could compare these values? Google has not been kind to me:( Any help would be so appreciated.

Dont give me the answer that its because of surface tension. I want it in detail.

EDIT: I'm not in my sharpest moment. I just found a bunch of posts that discuss this. I'll read them and update this post if I find an answer. I'm working on a hard-sphere MC simulation (for a class). I want to compute the radial distribution function g(r). To put you in context, as to my...

I have a few liquids and I want to determine the solubility of CO2 in each of these liquids. How can I set up an experiment to do so? Put the liquids through a CO2 environment and weigh the difference? Set up an upside-down glass tube (like a mercury barometer) with a CO2 bubble and see how...

Three tablespoons of milk from a glass of milk are poured into a glass of tea, and the liquid is thoroughly mixed. Then three tablespoons of this mixture are poured back into the glass of milk. Which is greater now: the percentage of milk in the tea or the percentage of tea in the milk?

Hi everyone! I am looking for a solution to heat up photo chemicals (I'm doing darkroom printing in a cold garage). I need the chemicals to remain at a fairly steady 20 degrees C, whilst the air temperature is significantly lower (e.g. 7 degrees). My question is whether or not an infrared...

This question isn't homework but rather a personal project I am working on, I need the following information please: In the measure of how light elements in the form of gas or other, behave in water or other liquids Pulling force that the Oxygen has in water as it rises to the surface...

I am building a liquid fueled rocket engine driven gas generator. I plan to use gasoline for fuel and oxygen gas at a rate of .022lb/sec and O2 at .055lb/sec The chamber is 2.15 in long 1.15 in id with a .238 nozzle. The chamber pressure should be 300 psi with a thrust of 20 pounds. I calculate...

Homework Statement A vertical right circular cylindrical tank measures 32 feet high and 8 feet in diameter. It is full of liquid weighing 62.4 lb / ft^3 How much work does it take to pump the liquid to the level of the top of the tank? Homework Equations h=32 d=8 (radius = 4) liquid...

I'm trying to make ferrofluid according to this guide: http://www.sci-spot.com/Chemistry/liqimag.htm and in step 5 I need to heat the solution to near boiling but I don't have access to a bunsen burner or heating plate. Also I can't do this in the kitchen because this heating is to remove...

So i realize that by putting your thumb over the top of the straw, your eliminating the air pressure from the top. But why doesn't the liquid still fall out the bottom of the straw from gravity, the liquid being more dense than the air below it.

Can anyone explain point 44 of the attached pdf document on surface tension. (Here's the link in case attachment doesn't work: http://www.sakshieducation.com/EAMCET/QR/Physics/Jr%20Phy/12Surface%20tension%20_198-208_.pdf) How is the surface tension direction found out? Also why is...

Really hoping someone can help here! Im a product designer, not a chemist/physicist so apologies in advance for any stupid questions. I'm developing a new table lamp which is turned on and off by tilting it. For prototypes I have used a http://www.bareconductive.com/liquidity but this isn't...

I've seen the standard derivation of the expression for liquid pressure P = dgh where, d = density of the liquid; g = acceleration due to gravity; h = height of liquid column in many textbooks has been done by using a specific example of a cylindrical vessel. In such a case, the geometry of the...

What are the factors affecting dispersion of salt in a mixture? Obviously stirring will guarantee effective mixing, but I'm wondering how much I could expect the salt to disperse throughout the stew if I were to not touch it. The stew is near/at boiling (100 C), but it is not vigorously...

Hi all, i have a problem here I need to solve asap. Homework Statement I need to find out the Time it takes for 6900 gallons of WATER to go from: 55 deg F. to 32 deg F. 55 deg F. to 20 deg F. ambient air set at 20 deg F. if needed The heat loss rate is 750 Btu/Hr/degF. Homework Equations...

ElectroMagnetic Wave In Liquid.. Help with Index of Refraction?? Homework Statement Consider the propagation of an electromagnetic wave in some liquid. The y-component of its electric field is given by Ey(x,t)=4.3 x104 V/m sin(5.40E-2m-1x + 6.00E+0 x106 s-1 t). How large is the index of...

Hi, Homework Statement A square frame with a thin crust/layer of liquid with surface tension γ is given. Into the plane of the frame an elastic wire of circular shape with radius r_0 is inserted. The thin crust/layer of liquid is then burst (by pricking) and as a result of the force of...

Is there some liquid planets out there? well there are gaseous planets... what are the laws that avoid the existence of a giant liquid planet with a little rocky nucleus?

Hi, A liquid in rotation give two kind of forces: 1/ centripetal 2/ pressure forces (Fa, Fb in the drawing) I'm ok that centripetal forces can't give energy (we lost kinetics energy) but Fa/Fb seems in direction to external circle, why it's not possible to recover energy from these...

The pressure difference sure.The point where there is higher energy in order to attain lowest level of energy moves towards region of lower energy, but if this liquid is viscous enough, doesn't the whole energy get lost during flowing? then how is the pressure level or rather the energy level...