Tube Definition and 886 Threads

The ideal gas law staes that pressure is inversely proportional to volume. Makes sense but I am confused by what happens in a venturi tube, where volume seems to decrease at the same time that pressure decreases also. I understand that dynamic pressure increases in the throat but what am I...

PVC End Plug and Tube shape retention under heat and force?? Hi, I'm Mai from one of the semiconductor company. I'm in charge in supplier quality enginnering. I have an issue happened in my customer side where, whenever they received the unit from us the unit will spill out from the packing...

A speaker is generating waves in a gas that is closed in a tube. The tubes closed end is at x=0 and the speaker is at x=1. The motion of the membrane is given by s=s_0 \cdot sin(\omega t) How does the particle displacement vary with x and t? The wavelength is \lambdaI do not know how to solve...

When I read some heat transfer book, I got a problem. There are some numerical calculation methods in dynamic heat conducting in tube wall, but all the methods assume the temperature on one side of the tube and then calculate the temperature distributed in the wall. But are there some methods...

Hi all, Im new to this forum and would greatly appreciate any help i can get. I work for a solar hot water company and we have taken on an unhappy client who has been sold a custom thermal storage tank (by another firm), with a corrugated stainless steel tube immersion heater. The hot...

Hello, I'm an undergraduate student, doing an independent research project under a professor this summer. So the experiment I am working on involves using a glow discharge tube, with electrodes at two ends, to create and contain a plasma column. The purpose is to measure and analyze "wave...

Hi guys, new to the forum here. I have of a conceptual question that I can't wrap my head around. Here's the situation: there's a reservoir filled with water attached to a "three-column manometer" with each column open to the atmosphere. The horizontal tube that connects all three of the...

Homework Statement An enclosed vertical tube rotates about its vertical axis at w=3000rpm. At the axis, r=0, P=1.5bar and T=293K. What is the pressure distribution as a function of r? And hence calculate the pressure at r=2m. The Attempt at a Solution I have seen this type of questions...

I came across a couple of cow magnets a while back. When you drop a cow magnet down the center of a vertical piece of steel conduit, it doesn't drop as fast as it usually would. When you drop a cow magnet down the center of a vertical copper plumbing pipe (closer fitting than the conduit)...

Homework Statement Water flows through venturi tube at 0.3 litres/s. Diameter of venturi tube is 32mm to 20mm to 32mm and the water density is 1000kg/m^3. Homework Equations a) Assuming head loss is neglible, what is pressure difference between 1 and 2. b) If pressure head...

Hello, I have a production problem and would welcome any ideas which would make this task easier. I need to fill a 5 meter tube with pellets of 5mm grain size. The inner diameter of the tube is approx 40mm. Here's the problem...I need to fill the tube while the pipe has only a...

Im making an A frame to tow a quad bike behind a car, i need to know something because it affects the design. Imagine a steel tube of an arbitrary length of 1 inch diameter, and 2mm thick walls.. It will have a specific inherent strength before load causes it to buckle or deform. now drill a...

Homework Statement http://img571.imageshack.us/i/reaction.png/ Homework Equations Velocity = (R^2-r^2) * dP/(4nL) VMax = R^2 * dP/(4nL) Average velocity = R^2 * (dP/(L*8n)) dP= change in pressure n = viscosity The Attempt at a Solution Average velocity = R^2 * (dP/(L*8n))...

I am converting some old gas cylinders into chimes. They are empty and have the valves removed. They held inert gas, not fuel gas. They are 8" inside diameter steel cylinders approximatly 5' tall. I wish to cut them to harmonic lengths, but do not remember what I learned in physics regarding...

Hello folks, I am on a project that involves combining Raman microscopy + optical tweezers, and I made a setup over the past year. All of this is home built on minimal funds so its not the neatest of all setups. It involves an upright microscope (coupled to trapping laser) and collecting the...

Homework Statement A long U-tube contains mercury (density = 14 × 103 kg/m3). When 2.0 cm of water (density = 1.0 × 103 kg/m 3) is poured into the left arm, the mercury in the right arm rises above its original level by Homework Equations Density*gravity*height(on the left...

3-pin (Gas Discharge Tube) Surge arrester rating "DC spark over voltage" Could someone please help with a question about Gas Discharge tube, surge arresters rating? I am looking at a public address audio equipment which uses a 100vrms audio lines driven from a audio transformer. Currently...

Homework Statement We have 5 cm of external diametre tubing with 200*C of superficial temperature. The boundary temperature is 20*C and the convective heat transfer coefficient is 3.0 W/m^2*C What is the heat loss Homework Equations q = U*A*(T1-T2) 1/U = 1/h1 + [r1 * ln...

Homework Statement A glass tube is closed at one end. The air column it contains has a length that can be varied between 0.50m and 1.50 m. If a tuning fork of frequency 306 Hz is sounded at the top of the tube, at which lengths of the air column would resonance occur? (Take the speed of sound...

Sportnut: If I am using exact same aluminum material, with exact same thickness of gauge and I construct a 4ft long hollow circular tube that is 1" diameter, and I also construct a 4ft long hollow rectangular shaft that is 1" square, which would be more resistant to bending?

Hi All, Thanks for your time. I'm not an engineer nor do I play one on TV. Last time I did any load calculations was in a some college M.E. classes and that was so long ago we were all still using slide rules just a couple years before. No really. I'm going to build a fold-up table for my...

I'm not even sure if it belongs in here... but my class is assigned to do this lab the objective is to determine that D=Vd/Va{(L1^2+2L1L2)/4d} is correct... so my teacher also want us to do 2 graphical analysis based on this formula I think i found one way of doing graphical analysis (if i...

Suppose we have a very small V shaped tube-like vessel that is closed at the bottom (see attached picture). Question 1: If a drop of liquid enters the vessel from the top, what determines the stopping point of the drop (i.e. at what point is the force of gravity countered and the drop...

I need to test a system for liquid sodium wicking under high temperatures. The setup is as follows: Solid sodium pellets are placed in a tube which is then purged of oxygen (replaced with Argon). The tube is sealed and then heated to 300-400 degrees Celsius and agitated with a shaking...

I need to test a system for liquid sodium wicking under high temperatures. The setup is as follows: Solid sodium pellets are placed in a tube which is then purged of oxygen (replaced with Argon). The tube is sealed and then heated to 300-400 degrees Celsius and agitated with a shaking...

Homework Statement Calculate the gage pressure of the air (in kPa) in the tank which is partly filled with the oil of specific gravity 0.8. Homework Equations P = pgh The Attempt at a Solution Taking xx at middle tube's mercury height : Right tube = Px = 13600 x 9.81 x 0.6...

Im trying to understand how a Geiger tube works. So there is a wire in the middle of the tube and then an outer metal shell and the wire and the shell are held at a potential difference. And the tube is filled with a gas like Neon , And when like an x-ray comes in, it ionizes a neon atom and...

Homework Statement Seawater flows through a horizontal tube of diameter 3.00 cm that is joined to a second horizontal tube of diameter 1.70 cm. The pressure difference between the tubes is 7.25 kPa. What is the speed of flow in the first tube? Homework Equations I thought it was P1 +...

Homework Statement Find the linear speed of the bottom of a test tube in a centrifuge if the centripetal acceleration there is 5.3×104 times the acceleration of gravity. The distance from the axis of rotation to the bottom of the test tube is 7.3 . Homework Equations I have gotten...

I'm trying to create a piece of software that can approximate the physics of a valveless pulse jet engine. What I need right now is to figure out the math behind the moving air. How would I calculate how the air from the combustion chamber after combustion (assumed for simplicity to be...

Hi, I was wondering what is the relationship between 'diameter size' and the strength to flex a hollow tube... is it linear or non-linear? I'm measuring the flexural load of different hollow tubes (with different diameter size) and looking for a way to normalize the the flexural load data...

I want to design a welded structure steel stand to hold the weight of 600 pounds, by using 4X4 square tube. Please help me to find the thickness of steel tube.

Homework Statement In a lab that we performed, we had a closed tube with piezo electric transducers on both ends, and they were attached to a frequency generator. We found the frequencies that caused resonance, and the lab wants us to calculate the velocity of the wave using data. The lab...

Standing waves have a fundamental frequency equal to 4x the length of the pipe if the pipe is closed at one end and open at the other end. So, blowing across the top of a 33.2 cm bottle should produce a fundamental frequency of v/4L or about 340/1.2= 283 hz. When I record the sound produced...

Homework Statement Have a few questions on CRT's. If we are given the accelerating voltage (250V) how would I calculate the kinetic energy of the electron as it leaves the positive end of the charge area? What is the formula for the speed of an electron along the tube (vz) as it leaves the...

I have an enclosure in which the electrical components put off 10,500BTU/hr. At the top of the enclosure the internal hot air is in contact with circular aluminum tubes. Ambient outside air at 70 degrees F is blown through the center of the tubes at 500cfm. Internal hot air and outside ambient...

Does anyone know of an equation that models the build up of potential energy in an extension spring induced by twisting it when its motion is otherwise constrained in the transverse direction?

I am looking to build a trapize style hanger that will be fabricated out of 2"x2"x1/4" cold formed steel tube 10'x4'x10' the shape is a U any idea where I can find the hanging weight of this type of hanger?

heya :D Homework Statement (Q)Water rises in a vertical capillary tube upto a length of 10 cm. If the tube is inclined at 45 degrees, the length of water risen in the tube will be <a>10 cm <b>10/(2)1/2 <c>10(2)1/2 <d>None of these Homework Equations Height raised in capillary, h =...

Homework Statement "A sound wave of 40.0 cm wavelength enters the tube shown below at the source end. What must be the smallest radius r such that a minimum will be heard at the detector end?" (figure attached)Homework Equations v =\lambdafThe Attempt at a Solution I don't have any idea how to...

I have a 39"x75"x0.75" area that has 180lbs resting ontop of it. According to P=F/A or P=180lbs/2,925 I^2 therefore P=0.0615... If a tube comes off of the side of the "box" that is 0.5" inside diameter would this have a pressure of 0.0615 or would I find this pressure some other way?

Help me explain how the "magnet dropped down a copper tube" demo conserves energy I've tried explaining to this person that the potential energy you give a magnet when you do work against gravity to raise it up to the copper tube is all the energy it has to deal with, and once dropped down it...

Building a Particle Accelerator Hi, I just stumbled upon these forums and joined with the hopes that I could seek some help from some more experienced people. Thank you for your time. http://bigthink.com/ideas/19050 http://bt.pa.msu.edu/pub/papers/steeremsc/steeremsc.pdf...

Hi there I am new to this forum and after reading like 100s of forums I can't find a solution so here I am So recently I conducted an experiment to measure the pressure using pitot tube and use that to find the velocity profile which would be used to find mass flow rate. The whole experiment...

Homework Statement Is it possible for a flute (tube open at both ends) 72 cm long and an oboe (tube open at one end) 64.8 cm long to produce the same note? Prove your answer. Homework Equations v=f\lambda L=(n/2)\lambda (tube open at both ends) L=((2n-1)/4)\lambda (tube open at...

Ok not a great title, but let me try to explain the idea. Imagine that you have say a parachute attached to the top of a flag pole. In the center of the parachute a hole is cut and connected to a plastic tube that goes to the ground. When the wind comes up the parachute exerts a drag on the...

I would like to build a cathode ray tube like this one: http://www.youtube.com/watch?v=XU8nMKkzbT8". It would be pretty damn cool playing with electrons. Do you know any references about this experiment? I mean, How could I build a glass vail and are there standard measures?

This really isn't a homework question, I just need help understanding some concepts. For my physics course, we have a section called "tutorial" where we work out of a book answering questions. Now I am not quite sure how to answer this one. Refer to the image below for the questions...

Has anyone ever considered this issue with magnet falling in copper tube?? Homework Statement I must explain why a magnet falling in a copper tube slows down. Homework Equations F = B^qv However, I must *explain* this, I don't have to calculate anything The Attempt at a Solution...

I've got this problem where I've got a molten polymer (polyisoprene) in a region where I can imagine a cubic lattice. I am told that it has a density of 910 kg/m^3 and an entanglement molecular weight of 3.7 kg/mol. earlier in the problem I have to figure out the molecular weight of an isoprene...