Tube Definition and 886 Threads

The question is as follows: A circular tube of radius 'a' bifurcates into two tubes with equal radii 'ka', where k is a dimensionless coefficient. Derive an expression for the ratio of the pressure gradient in each bifurcated tube to that in the initial tube in terms of 'k'. I'm not sure...

Hi I am trying to solve for the energy potential inside the cavity of an oscillating cylinder. At first, I solved the wave equation for an axisymmetric cylindrical cavity. Since the cavity is a perfect cylinder , the boundary condition was a constant at the surface of the cylinder (as...

Homework Statement A thin tube, sealed at both ends, is 1 m long. It lies horizontally, the middle 10 cm containing mercury at the two equal ends containing air at standard atmospheric pressure. If the tube is now turned to a vertical position, by what amount will the mercury be displaced...

Hi, I've did an experiment today, a forced convection in circular tube where the heat flux is constant along the length. my result seems not follow what it should be.. [PLAIN]http://img688.imageshack.us/img688/8015/expresult.png what I'm wondering is shouldn't it in a fully...

Why couldn't Thompson just let one electron fly across the gap before disconnecting the battery and turning off the beam, and then measure the amount of charge deposited on the anode,thus allowing him to measure the charge of a single electron directly?

Homework Statement Problem 2 b) in the following link http://www.math.ubc.ca/~haber/courses/math253/Welcome_files/asgn4.pdf" Homework Equations V=pi(r1r2)H SA=? The Attempt at a Solution I was thinking I should form two equations V=10=pi(r1r2)h and then an equation for the...

Homework Statement Prior to completing an experiment in which the objective was to analyze control volume energy and entropy in a vortex tube in the Thermal and Fluid Science Laboratory course I am taking, I was required to solve the following two thermodynamics problems: 1. A vortex tube...

Hello, I am looking for the most effective shape to pinch a rubber tube. The most effective shape requires the least force. Given a tube of certain diameter/thickness, I want to know whether I should use a flat, curved, knife edged or whatever type of pinch and what thickness it should...

Homework Statement Let A and B be compact subspaces of X and Y, respectively. Let N be an open set in X x Y containing A x B. One needs to show that there exist open sets U in X and V in Y such that A x B \subseteq U x V \subseteq N. The Attempt at a Solution Here's my try: First of all...

This is for a mass spectrometer project so the photomultiplier tube will be hit by charged proteins or other macromolecules. This project is mostly DIY so I'm trying to avoid buying any expensive parts. Anyway, from what I understand, electron multipliers work by releasing secondary emission...

Homework Statement A glass capillary sealed at the upper end is of length 0.11m and internal diameter 2 x 10^-5 m. The tube is immersed vertically into a liquid of surface tension 5.06 x 10^-2 N/m. To what length has the capillary to be immersed so that the liquid level inside and outside...

Homework Statement Two coaxial metal tubes (placed vertically) have an inner radius a and outer radius b. They are placed vertically between a dielectric oil (with susceptibility X and mass density p). The inner tube has potential V and the outer one is grounded (V=0). How high will the oil...

Homework Statement What happens when the tube is (a) overheated or (b) too cool. Homework Equations The Attempt at a Solution I searched on google and almost all said: " If the tube has been overheated, the emission current is small, and maxima and minima can hardly be recognized or...

Suppose you had a hollow tube, closed at both ends. The tube weighs 10 pounds and would float in water. Suppose also there is an empty container with a hole at the bottom. The tube is stuck through the hole so that half of it is in the tank and half is sticking out the bottom. Assume a...

Homework Statement You need to calculate the electric potential for a thin, long tube with a uniform surface charge density (σ). This tube has a length L and a radius R. Find the electric potential along the tube axis for points outside the tube. Homework Equations The Attempt at a...

Ok so I have this tube of length 2R that rotates in the horizontal xy plane with constant angular velocity \omega about the z axis. And there is this particle of mass m that is released a distance R from the origin. Assuming the tube is frictionless I need to find the direction of the...

Hello, I have an electric cable in a vertical steel Tube. I estimated the temperature that will reach the JTube exposed to sun radiation. I came with these equations QCable+ Qsun - Qradiated = mc( Tfinal - TAmbient) where QRadiated= k.A.(Tfinal^4-TAmbient^4), QSun=234 [W/m^2] * A...

I guess it has been too long since i have had to use any math beyond arithmetic. I am working on fabricating some tube work, and these similar shapes keep coming up. I keep thinking i can calculate them out, but for some reason i always get stumped and feel like i am missing some information. I...

i need complete theory of tht pleasez help me

Hello everyone. I have been trying to determine the tensile force needed to rip a threaded tube out of its female threaded socket. After some Google searching, I found this: http://www.engineersedge.com/thread_strength/thread_bolt_stress.htm I used shear area, which I believed to be an...

Hi All, Sorry for the cross post, I had an earlier version of this in Classical Physics which has errors. Please disregard. Problem Description: The drawing shows an adapter to secure a container to arms which connect to an off road moving dolly (not shown). A 6x6 beam has two arms (6"...

Problem Description: The drawing shows an adapter to secure a container to arms which connect to a moving dolly (not shown). A 6x6 beam has two arms welded to the ends that support the container at the sides and two opposing arms (4" deep and 8" wide) offset 2' toward the center that connect...

So if i have a marble in a glass tube and i rotate the tube around in a circle . and the marble is at a distance r from the center of rotation . is the reason the marble goes towards the outside of the tube because when the glass tube starts to rotate the marble wants to go tangent to the...

hi, does anybody know how much pressure there is inside a discharge tube?

This is neither homework nor a question from an exam. I am an aging engineer and I am reviewing all of the calculus that I have forgotton. On p.410 of 'Calculus with analytic geometry,' 5th ed. by Howard Anton, Chap. 7 technology exercises, problem #15, paraphrased slightly to be (hopefully)...

currently, I'm be studying on improving fire tube boiler's combustion efficiency. so, i need a software which is applicable to the title above in order to prove my calculation according to the formula. can u tell me what software can be used?

Hi - I hope this is the correct forum for this question... I'm building a camera jib arm - essentially a 1.5" sq aluminum tube, 15' long, with a pivot point in the "middle". A camera goes on one end, and counter weights on the other. I'd like to know the limits of the aluminum so it...

hello guyz i have some questions about shell and tube exchangers 1- what's the difference between shell and tube exchanger over the plate exchanger ?? 2- what's the data required for selecting heat exchanger ?? 3- if i will replace the shell and tube with a plate exchanger what's the...

I'd like to calculate the maximum deflection a PTFE tube of 65mm diameter and 5mm thickness. The tube is roughly 3m long and a 1.3m section will be unsupported, I want to know what the maximum deflection the end will experience under it's own weight. I've looked up it's tensile stength which is...

Homework Statement A brass tube of mass 23 kg and length 1.5 m is closed at one end. A wire of mass 9.9 g and length 0.39 meters is stretched near the open end of the tube. When the wire is plucked, it oscillates at its fundamental frequency. By resonance, it sets the air column in the tube...

I was wondering if anyone knew the formulas uses to calculate the length and size and spacings of the drift tubes used in accelerators, and the formula used to calculate the frequency the tube is driven at. Edit, looks like I put this in the wrong section, hopefully someone can move it.

Homework Statement Sketch and label the x-ray spectrum for an x-ray tube with copper as its target, operating at an excitation potential of 20kV.Assume that the copper energy levels are K shell=-9000ev,L shell=-1000ev,M shell=-200ev. Homework Equations This question has me a bit...

Garrett's own critique of the show and himself http://www.math.columbia.edu/~woit/wordpress/?p=2990": Rhody...

3" x3" tube, 3/16' vs 1/8" thick load strength Hello, Any help would be appreciated. After calling umpteen places, and searches, I've found this site, which is a gold mine of info, and thanks for that. I am trying to figure out what the load strength of steel tubing, that is 3" x 3" 3/16"...

I remember seeing a physicist on TV putting an argon or nitrogen sealed glass tube in a microwave and when he turned it on the tube started flashing an emitting visible light, So how come when i put a sealed glass jar that i glued a lexan lid on in the microwave it does not emit light , i...

Hi I am reading and trying to comprehend the article "Dispersion of soluble matter in solvent flowing slowly through a tube", Sir Geoffrey Taylor, Proceedings of the Royal Society of London, 1953. I am particularly interested in cases A2 and B2, where a concentrated solution is injected...

Homework Statement My teacher did NOT tell us how to do this. A Herschel tube is used to determine the frequency of a tuning fork held at the inlet. The temperature is 28 degrees Celsius and the initial path lengths around each side are 75 cm each. The right hand side is now extended as the...

Shanghai Tian Yang Steel Tube Co.,Ltd. is a modern enterprise for tube making which is specialized to make the seamless steel tube of DIN series featured with high accuracy and brightness. Our company has the staff with highly educated and richly experienced engineers and the employees of...

Let the cross sectional area of the tube be given by A and the position of the cylinder by s, and assume that the gas is ideal so that the pressure times the volume (Ω) is a constant. i.e. pΩ = constant. Show that the potential energy of this compressed gas is given by V =...

I am considering a tube railing system to transport a carriage. It will incorporate gear track/gear drive motion. I wish to support this on 1" to 1 1/2" steel tubing. the rate of travel will be 6' a second. Is this possible on such small deminsions. I have had experience on much larger...

Why first photon emits two electrons in a photomultiplier tube? The interaction is one photon with one electron, am i right? Thanks in advance.

Hi, I experimented with a hydrogen tube and after some time the emission stopped.could it be because all hydrogen atoms became completely ionized?

Homework Statement When you have an open-closed tube, I was taught in high school that when using the equation λ = 4L/m, m = 1, 3, 5, 7, ... where m = 1 corresponds to the fundamental mode. I was taught that m = 1 is the 1st harmonic, m = 3 is the 3rd harmonic, etc. But my physics...

Old CRT tv's use vacuum tubes and they get hot, but how does the glass get hot when the inside is under a vacuum and therefore shouldn't transfer any heat?

My boss just told me to get him this today and the last time I took a mechanic class pluto was still a planet. See diagram attached. Both bulkhead A and arm are made of aluminum T6061 hollow tubes. Arm is at center of A. Assuming that arm will never break off from A, will the current...

i know vortex tube is an element used to cool the air by changing pressure i d like to know how does it work exactly ??

When my Tv shoots electrons from the cathode ray tube , where do these electrons come from and is it ionizing whatever they come from.

Homework Statement Now two fluids are placed in the same tube (d). Both sides are open to the atmosphere without pistons. One fluid is water and the other (on top of the water in the left branch of the tube) is an oil of unknown density. l = 135mm and d = 12.3mm. What is the density of the...

Hi, I have a pretty elementary question, but I'm having trouble finding an adequate explanation on the web. I'm trying to figure out how a carburetor works, and am having difficulty figuring out how a venturi tube works. On the one hand, as air flows through a narrow section of a pipe, it...

Homework Statement What is the yellowish light beam in the Teltron tube before the accelerating voltage is raised up? Homework Equations - The Attempt at a Solution When we switch on the device, the initial light beam is in yellow color. When we adjust the accelerating voltage to a...