Tube Definition and 829 Threads

Homework Statement Helium at 20°C passes through a pipe with an initial diameter of .3 meters decreasing to .25 meters. The helium flows at .30 kg/s and an initial pressure of 200 kpa. Find the difference in pressure ΔP across the decreasing section. Assume incompressible and inviscid flow...

Homework Statement The assignment is not in english but I'll try to translate it. I hope I've posted it in the right thread. You have a tube which is 48 meters long and one end is closed while the other end is open. You take the tube with the open end first into seawater (1025 kg/m3) and drop...

Homework Statement For a flow of a compressible fluid through a narrow tube, the following statement is correct a) the volume of the fluid crossing any section of the tube is constant. b) density of the fluid is independent of pressure. c) mass of the fluid crossing any section of the...

Hey guys. I can't figure out part 3bii) of this Venturi Tube Question. The answer I keep getting is 3.7907E-03 but it should be 3.95E-03. I'm definitely missing something but can't figure out what. I'm out by about 5%, could it just be down to rounding errors? Question and my working is...

I've been looking to do a physics project, and since particle accelerators are too dangerous, I was thinking about building a cathode ray tube (CRT) I've done some research about building CRTs, and haven't been able to find anything that gives a complete list of how to build a CRT. Could anyone...

Why is it that the maximum sound coming from a Rijke tube happens only when heated wire gauze is placed at 1/4th the length of the tube from the bottom. According to Rayleighs criterion(copy pasted) "If heat be periodically communicated to, and abstracted from, a mass of air vibrating in a...

Hello guys, Ok let's say there is a man with fluid in his lungs. You put a chest drain (intercostal tube). How does it drain? 1. Since the container is below the chest, when the guy expirates due to high pressure does fluid just flow to container? Can there be any retrograde flow (since...

Homework Statement In a lab experiment on emission from atomic hydrogen in a discharge tube only a small number of lines are observed whereas a large number of lines are present in the hydrogen spectrum of a star. Why? The Attempt at a Solution I think it is related to temperatue but I...

Homework Statement A capillary tube of radius r = 0.3mm is filled with water. A water droplet is hanging on the bottom of the tube, as shown in the picture. The water level is h = 5.2cm. Estimate the radius of curvature of the droplet R. The coefficient of surface tension of water is σ =...

Homework Statement An incompressible fluid with density ρ is in a horizontal test tube of inner cross-sectional area A. The test tube spins in a horizontal circle in an ultracentrifuge at an angular speed ω. Gravitational forces are negligible. Consider a volume element of the fluid of area...

My question is: Researching two sizes of square steel tubing to use for a project. material 2 inch square tubing with 0.25 thick wall and 3 inch square tubing with 0.25 thick wall. The square steel tubing will be welded on to a frame at an angle so the corners point up and down , or another...

Invention prototype -- help please with bent half tube... Hi all, I am in the prototype phase of an invention and I need part that I can't get made and was looking for a few ideas. As you can see the part is double-curved 16 gauge sheet metal. I brought it to a sheet metal shop and the guy...

Hey guys any help you can help me solve a problem at work. I've been UV testing some polymide tubing and I need to know if it will survive one of our manufacturing processes post UV exposure. The OD is 21 (0.91 mm) thou and wall thickness is 3 (6.4 mm) thou. It will be loaded with approx 4kg...

Hello, I was wondering if I could get some advice on how to build a robot that can traverse the inside of a twisting square tube, whilst staying at its centre. Heres an image of the kind of tube it will be: Its probably doable with a rollercoaster style design but it seems like an...

I'm trying to model a Transfer function for the response of the deviation in temperature of water coming out of the concentric tube heat exchanger in response to an input velocity of water function. THE PROBLEM I start the derivation with a couple equations in Seborg's Process Dynamics...

Bill and Ben are a fixed distance from each other. Bill sends a laser pulse to Ben and times how long it takes to get there and bounce back. Now a very heavy tube is placed in between Bill and Ben. The light pulse is sent again so it passes through the tube. The tube is along the same axis...

Homework Statement Bead (mass point - mass m and charge q) is free to move in a horizontal tube (without friction). The tube is between two spheres (separated by a distance 2a) with charges Q = − q. What is the frequency of small oscillations around the equilibrium point of the bead...

Hi, i have been working on this problem for a while. i just need some guidance. the question is: design a ztube scanner suitable for displacing ±1 micron displacement at 200V. i am using this equation: ΔL=([d]_{}[/31]×V×L)/t ΔL=(d31 ×L×V)/t ΔL=change in length = 1micron...

I am working with mild steel 1/16" wall tubing. I am sleeving this over another tube to extend it. The attachment point is 12" past the end of the sleeved tube. How much weight can the extention tube handle before it would bend? Thanks

Homework Statement Please refer to the image attached. Homework Equations P=hρg The Attempt at a Solution My workings: 16000=h1ρg 8000= h2ρg Since ρ and g are constant, therefore h1:h2 must be 2:1. But the answer is 18:12. Why am I wrong?

Homework Statement (1.1.10) The diagram below shows a U-shaped tube. The fluids in the tube are glycerine (blue shading) and mercury (gray shading). The height of the glycerine column on the left side of the tube is h1 = 5.00 cm. The density of the mercury is 13.53 g/cm3 . (a) What is h2...

Hi Everyone, Hope this is the right section of the forum. I need some help to design a small tube heater for a specific application. I have attached a crude picture to show what i need. The flame needs to travel through a 3/4 inch pipe about 7 feet to heat the water. The problem is that i...

Homework Statement A chain AB of length ##l## is located in a smooth horizontal tube so that its fraction of length ##h## hangs freely and touches the surface of the table with its end B. At a certain moment, the end A of the chain is set free. With what velocity will this end of the chain slip...

I have a question about how to calculate what size of steel tubing to use in building a boom for a wrecker. Tentatively the compressed length will be 12, and extended I would like to be 28' as this will be a 3 stage boom. I would like to have a safe working load limit of 5Ton at full extension...

The problem statement Recently I came across this problem and couldn't understand it. I know that in situation 1, the length of the specific place will be decreased; In situation 2, it will be increased. Can someone help me here? Thanks first!

Homework Statement An electric charge q is uniformly dispersed over a surface of elliptical tube with major and minor axis a and b. What is the surface charge density?Homework Equations The Attempt at a Solution I I know that you have to cut the tube into thin ellipses and calculate a linear...

We know that we get first resonance when the length of the air column is λ/4. We get second resonance when the length of the air column is 3λ/4. This is because we get a node at the surface of the water after λ/4 distance in the first case and 3λ/4 in the second case. My question is that what...

Homework Statement a) Find the frequency of vibration under adiabatic conditions of a column of gas confined to a cylindrical tube, closed at one end, with a well-fitting but freely moving piston of mass m. b) A steel ball of diameter 2 cm oscillates vertically in a precision-bore glass...

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...

Hi Seniors and Fellows I really need your help to finish my project .I have struck at a point which is given below :- I have to do insulation around a vacuum tube in which thermocouple is placed . I have to choose a high temperautre 650 C insulation material. Inner and outer diameter of...

Hey y'all, Thanks in advance for any help on this. I'm kind of stumped by this problem I've come across in the lab. We have a tube reactor with a nozzle, and we want to measure the combustion/pyrolysis products coming out the model using GC/MS and MBMS. Right now, we are just running...

Fluid flows faster in a narrow tube which results in low pressure and high pressure in a large tube?

Find the friction coefficient between the bar and the surfaces. Both surfaces are equal (and thus have equal coefficients). Ok so, my problem is that, generally in physics when I assume an wrong direction for a vector, I will be able to discover that in my answer (generally speaking the...

Hi, Can you explain why the light increases when Prof. Lewin touch the end of the tube with his finger? He explained it but I am not quite understand it. The video is here at 45:40 : http://www.youtube.com/watch?v=ldJhMDuOGxY

Hi I have a function, which is cylindrical symmetric given by f(x, y, z) = \exp(-x^2-z^2) For a given y, the function \exp(-x^2-z^2) = c traces out a circle (where c is a constant). A contourplot of f(x, 0, z) is attached. However, this is for y=0 (currently, I get the same plot for an...

Homework Statement It is observed that a tube open at both ends exhibits harmonics at 438 Hz, 584 Hz, and 730 Hz. A) Calculate the fundamental overtone of the tube. B) Calculate the length of the tube. Homework Equations L=lambda/2 x n, v = f x lambda The Attempt at a...

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...

How much weight can .75" sq tube tripod handle I would like to build a tripod 12' high to lift and permanently hold approx. 150lbs. It will be lifting an 18" dia. drum as high as the tripod will allow. I thought of using a triangle shaped plate at the top to enlarge the upper diameter of the...

Magnet dropped down a copper tube experiment (magnetic braking?) Homework Statement Experiment: what is the effect of the # of magnets on the time of drop through the pipe? Magnets are placed in a paper cylinder container - "one magnet" is 1 magnet and 5 weights (mass of 1 magnet and 1...

Hey guys, Long time lurker, first time poster! Here is my query... I need to send a load weighing 10-12kg down two horizontal, parallel, cantilevered, grade 316 stainless steel tubes -- or bars -- each between 3-4 feet in length, 3/4" in diameter, and spaced 85mm apart. What I'd like to know...

Homework Statement A 42.9cm long tube has a 42.9cm long insert that can be pulled in and out. A vibrating tuning fork is held next to the tube. As the insert is slowly pulled out, the sound from the tuning fork creates standing waves in the tube when the total length L is 46.8cm, 79.2cm, and...

Homework Statement In class a 3 m long aluminum bar was made to resonate by clamping it at a node in the centre of the bar. The frequency heard was 1200Hz. Homework Equations L = \frac{n}{4}\lambda v = f\lambda The Attempt at a Solution Knowing that L is 3, we can...

The principle states: δxδp≥h/4π I understand what it means and I've seen in proven both theoretically and expiamentally, so I am not questioning the inequality here. My question is: If there was a very narrow tube that had a vacuum inside it and a laser attached at one end that shoots...

Homework Statement Part a) Deflection of the electron beam in a cathode ray tube television set has electrons accelerated until they have K.E. of 25 keV. What is the magnetic field magnitude required to deflect the electron beam 3.3 cm when the magnetic field is 8 cm long? Part b) When...

Homework Statement An upper tube of cross sectional area A, atmospheric pressure, and height h1 is connected to a lower tube with cross sectional area A/2 (and height 0). A fluid of uniform density rho flows through the system, with velocity v measured in the upper tube. A small open tube...

Hey all, First post, thanks in advance for any help. I see there is a lot of discussion on this site and others about nichrome heating elements. I apologize if my question is very similar to others, but I have not exactly been able to figure out what I need to learn/lookup to answer my...

any one knows why sound wave reflects at the opening end of the resonance tube? is the air inside the tube different from those outside. from the expriment, when the incident wave interference with the reflected one, the destructive point reachs almost zero showing that the reflected one has...

What I need is a 1"x.5" rectangular tube .065" wall and 84" long steel tube that will have the least or very low deflection. I have been trying to educate myself today on the different grades of SS which would be preferable for rust resistance. If I understand things correctly 304 SS is the...

Homework Statement The hollow tube is pivoted about a horizontal axis through point O and is made to rotate in the vertical plane with a constant counterclockwise angular velocity θ'=3rad/s. If a 0.1-kg-particle is sliding in the tube toward O with a velocity of 1.2 m/s relative to the tube...

1. The air in a closed pipe with an adjustable plunger in is made to vibrate at a frequency 256 Hz over its open end. As the length of the pipe is increased, loud notes are heard as the standing wave in the pipe resonates with the tuning fork. (a) What is the shortest length that will cause a...