Fluids Definition and 482 Threads

Hey Just wondering why atoms in liquids can be considered classically If you compare the deBroglie wavelength with the atomic spacing, I understand that the deBroglie wavelength should be much smaller than the spacing. But how could you show that? If \lambda = \frac{h}{mv} How...

Hello, I am having some difficulty in understanding the terms in Bernoulli's equation. Bernoulli's equation is given as follows: P + 0.5(rho)(V^2) + (rho)gh = constant (along a streamline) The first term (P) is the Static Pressure. The second term (0.5(rho)(V^2)) is the Dynamic...

I have made decent progress with my ballistics model, but I have run into trouble and I'm not quite sure how to solve it. This particular problem deals with penetration and tensile cavitation. Based on the Held equation for cavitation in jet penetration (still haven't found any sites discussing...

Fluids doubt...water falling from a tap When water falls from a tap its area of cross-section is supposed to decrease progressively in accordance with the equation of continuity A1V1=A2V2 in order to maintain the conservation of mass. But using another line of thought, every particle in a...

1. The pressure at the start of a 180km stainless steel natural gas pipeline is 4Mpa and at the end is 2Mpa. If the diameter of the pipe is 0.4m, what will be the gas flow rate through the system? (ignore losses other than friciton) (for natural gas, \rho= 40kg/m3, \mu= 11x10-6 Pas2...

We are studying the waterhammer in a Refinery. Since the bulk modulus is involved in this study, we will like to know where to find the bulk modulus at different temperatures and pressures for several refinery fluids such as kerosene, diesel, atmospheric and vacuum residue. We have found some...

First let me apologize for any spelling mistakes as I am on a mobile device. Second I do have a few questions regarding thermodynamics for a project I would like to begin. 1) is there a way to calculate a volume of water in either the amount of time and the amount of energy required to make...

Suppose I have a fluid of uniform density confined to a roating cylinder of radius r turning at an angular speed of \Omega. Now I am considering the fluid in the rotating frame and I know that the fluid is in equilibrium. What does this imply? If the fluid is in equilibrium are there any...

Here is the problem: (Question 5-2 in Binney&Tremaine Galactic Dynamics) Consider a homogeneous self-gravitating fluid of uniform density \rho_0 contained within a rotating cylinder of radius R_0. The cylinder and the fluid rotate at angular speed \Omega about the axis of the cylinder, which...

Homework Statement A small block is attached on the left of a larger block by a thin layer of grease, 2 micrometres (10^-6) thick. The mass of the smaller block is 0.15 kg and the area of contact is 8x10^-4 metres squared. If the smaller block slides down 5 mm in 2 weeks, calculate the...

Since there is no friction on a super fluid, can they be spun faster and faster until they reach relativistic speeds? I'm not totally sure the method you would use to spin the fluid, possibly electromagnatism somehow but assuming it were possible.

Homework Statement A physics book has a height of 26.0 cm, a width of 22.4 cm, and a thickness of 3.10 cm. (a) What is the density of the physics book if it weighs 18 N? ? kg/m3 (b) Find the pressure that the physics book exerts on a desktop when the book lies face up. ? Pa (c) Find the...

Homework Statement Vessel contains water.It is placed on the pan of a physical balance.A solid(specific gravity=1) is suspended from an thread(from an independent support),such that it is immersed completely in the water. What the weight it reads? If the thread was tied to the arm of...

Homework Statement SAE no. 10 oil has a viscosity of 0.2 Pa· s. How long (in sec) would it take to pour 4 liters of oil through a funnel with a neck 10 cm long and 2.9 cm in diameter. Assume that it is poured in such a way that the oil level is kept just above the top of the tube. Hint...

Hey, these two questions are off a take home test I was given. I could use a good grade on them so could anyone give me a hand? thanks A raft with a length of 8.0m, a width of 1.6m, a thickness of 0.11m, and a density of 690.0kg/m^3 is placed in a river. How far below the water's surface does...

Homework Statement What pressure does a person standing on the ground exert? Homework Equations The Attempt at a Solution This has something to do with fluids, but I'm not sure what! I think I should model the person as a cylinder and find the pressure on the person, then find what the...

ive got this q in my homework calculate the pressure at the centroid and hence the force acting plate. the surface is free liquid is water. ive using a formula l x e = y l being length or depth in this case e being value of water which i found to be 1 x 10 to power of 3 kg/m3 y being the...

Hi all, Need a bit of help with a problem. I have a 4 inch pipe (carrying water). On the end of this 4 inch pipe is a 2" orifice. Now flowing through this orifice is water at 50L/s at a head of 100m (790 GPM and 330 feet). Basically as you can imagine, there is a lot of energy behind this...

I don't know the answer to this because i can't find it on the net or textbook, i need to know a type of fluid that is one where density varies throughout the fluid system? (Eg, a fluid system of oil and water among others) Thank

Homework Statement A block of weight W is being pulled over a table by another weight Wo, as shown in the figure. Find an algebraic formula for the steady velocity U of the block if it slides on an oil film of thickness h and viscosity μ. The block bottom area A is in contact with the oil...

Hopefully I'm posting this in the correct forum but I was just wondering, when would would a physics major learn about fluids? We covered it a little bit in high school but I don't see fluids at all in my university's curriculum.

Hi, I'm trying to get an expression for the shear rate in a rotating cylinder (as pictured) in terms of the inner cylinder radius, outside cylinder radius and angular velocity. The inside cylinder remains fixed and only the outer cylinder rotates. Assume that the distance x is small. Any...

Homework Statement In a hydraulic lift, the radii of the pistons are 2.50 cm and 10 cm. A car of mass 1000 kg is to be lifted for inspection. b) what force must be applied to the proper piston to be able to lift the car with ease? C) If the smaller piston is pushed by 10 cm, how far is the...

Hi, I'm trying to investigate how the force exerted onto a human body is affected by the presence of a surrounding liquid. Since the liquid can't compress the pressure is distributed in all directions. If a person is accelerated with this liquid, he/she + the mass of liquid will feel a force...

College Physics Homework Statement The figure shows a section of a long tube that narrows near its open end to a diameter of 1.0mm. Water at 20celsius flows out of the open end at 0.020 L/s What is the gauge pressure at point P, where the diameter is 4.0mm...

College Physics Homework Statement The figure shows a syringe with a 4.0-cm-long needle, filled with water at 20celsius. What is the gauge pressure of the water at the point P, where the needle meets the wider chamber of the syringe...

Homework Statement The handle of a hydraulic jack is 15 cm long and is pivoted 2.5 cm from the input piston which has a radius of 0.60 cm. The output piston has a radius of 1.2 cm. What weight could be lifted by the jack if the person pushing on the handle is to exert no more than 110 N of...

Homework Statement A lost shipping container is found resting on the ocean floor and completely submerged. The container is 6.3 m long, 2.1 m wide, and 2.6 m high. Salvage experts attach a spherical balloon to the top of the container and inflate it with air pumped down from the surface...

Homework Statement A rectangular metal can with dimensions of 0.234 meters by 0.194 meters by 0.143 meters is used in a physics demonstration to show the force exerted by air pressure. A small quantity of water is poured into the can and brought to a boil. Then the can is capped and allowed...

bernoulli's principle- fluids...? Homework Statement http://img30.imageshack.us/img30/4119/45086777.jpg Homework Equations A1V1=A2V2 P2+1/2pv1^2 = p1+1/2pv2^2 P+1/2mv^2 + pgy = constant The Attempt at a Solution V2=A1*V1/A2 1/2*p*A1^2*V1^2*p*g*h/A2^2=1/2pv1^2 2*g*h*A1^2V1^2/ A2^2=V1^2...

Homework Statement A spherically shaped balloon has a radius of 11.5 m, and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of 1200 kg? Neglect the bouyant force on the cargo volume itself. Homework Equations Fb =...

If we consider a system of N suspended particles diffusing through a narrow channel. What happened if the hydrodynamic interactions are neglected? Is there only flow? How can the particles diffusse without flow?

We are using the MatPIV Matlab toolkit: http://www.math.uio.no/~jks/matpiv/ However, we are having trouble using the toolkit with viscoplastic media. It was expected to find a yielded region and a unyielded region, however, from the results of MatPIV it appeared that the whole area was...

I'm trying to do this demonstration for a high school class: Using different shapes of "boats" I'm going to demonstrate how each boat shape affects the flow of water across it - does the water glide smoothly around the boat or become turbulent? My professor briefly mentioned that "rheostatic...

Homework Statement The plastic tube has a cross-sectional area of 5.00 cm². The tube is filled with water until the short arm (of length d = 0.800 m) is full. Then the short arm is sealed and more water is gradually poured into the long arm. If the seal will pop off when the force on it...

Homework Statement A helium-filled balloon is tied to a 2.00-m-long, 0.0500-kg uniform string. The balloon is spherical with a radius of 0.400m. When released, it lifts a length h of string and then remains in equilibrium, as in the figure. Assuming envelope of the balloon has mass 0.250...

I have been trying to find out how to calculate a number of things in a system involving liquid and gas. In the attached diagram there is a U-bend with gravity acting down on it. If one side is sealed with a plunger and the other side is filled with a fluid (L) we would end up with the...

Homework Statement The L-shaped tank shown in Fig. 14-33 is filled with water and is open at the top. If d = 3.24 m, what is the force due to the water (a) on face A and (b) on face B? IMAGE: http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c14/fig14_33.gif Homework Equations i...

How would one determine the charge density of a fluid? I'm using the equation of I = qnvA . Amperes = charge of electron * charge density * velocity * Area. The only thing I'm not sure of is how to determine charge density. I've read several websites and I have a few textbooks here...

Homework Statement A duct system that exhausts air of density 1.2kg/m3 from a building out into the atmosphere is shown in fig. A2 (attachment). The air flow is driven by a fan across which is a monometer that reads 2 cm of water. The cross sectional areas of the upstream and downstream...

Homework Statement Homework Equations \sum(\dot{m}\vec{v})_{exit}-\sum(\dot{m}\vec{v})_{inlet}=\sum F_{ext} I only know that this is cons of momentum because my prof told us. I am having a hard time visualizing how to incorporate THETA into the above equation since it is not a...

I'm guessing it has something to do with the fluid gaining thermal energy from the heat, the heat makes the molecules repel each other further so the fluids volume expands? if not why do fluids expand with heat? - the rest is mandatory, after expanding the volume increases, decreasing the...

does anyone know how to go about calculating discharge from a velocity diagram of flow in a pipe? thanks for anyhelp

Homework Statement 1. Is pressure always force/area? or is it only for static fluids? 2. I read that the equation for hydrostatic pressure is (initial pressure) + density x gravity x height, but How would I know to use that instead of Force/Area? Also is the initial pressure always atmospheric...

I've read (and experienced!) that pressure in fluids acts in all directions. Why is it so? I understand that if you dive 5 meters down in the water, the water's weight is greater than 1 meter below water surface. So if I'm standing up there under the water, I should feel a greater pressure on...

Homework Statement In the figure below, an open tube of length L = 1.8 m and cross-sectional area A = 4.6 cm2 is fixed to the top of a cylindrical barrel of diameter D = 1.2 m and height H = 1.8 m. The barrel and tube are filled with water (to the top of the tube). Calculate the ratio of the...

Homework Statement 1. Do you use the equation of continuity and Bernoulli's equation simultaneously in a question? When do you use them? 2. In simple harmonic motion, why is the velocity shifted to left of the displacement by pi/4? Homework Equations pressure + .5density x velocity...

Good afternoon, I am having some trouble solving this basic fluids problem, and I am hoping you can look over my work, and offer some assistance. Homework Statement A submarine has a total mass of 2.1 multiplied by 10^6 kg, including crew and equipment. The vessel consists of two parts...

Hi all. There's a couple of things I have thought about, and I hope you can clarify this for me. 1) In Torricelli's experiment with the tube and mercury, the vacuum-part in the tube has zero pressure (as vacuum always does). Does this mean that it is never possible to "suck" the mercury out of...

According to Schutz book, in special relativity general fluids in the MCRF (Momentarily Commoving Reference Frame) are characterized by no bulk flow of the fluid element and no spatial momentum in the particles. The energy-momentum tensor elements T0i (flux of energy across i-surface) are not...