Tube Definition and 829 Threads

Homework Statement I have to find out a relationship between the deflection of an electron beam in a cathode ray tube and the accelerating voltage. Homework Equations I know that theoretically D is inversely proportional to the accelerating voltage. The Attempt at a Solution I have to...

Homework Statement For a tube with one end open and one closed a) Draw a labelled sketch of the stationary wave patter for (i) the fundamental and (ii) the next highest mode. b)describe the physical quantity graphed (as the verticle axis, i.e. the dependent variable) c) clearly explain...

Hello, say you have a cylindrical magnet magnetized through thickness (not radially) and you drop it through a copper tube. It will slow down. Is there an opposite force on the tube? If you were to hold the tube in your hand and drop the magnet inside, would the tube feel heavier?

Here is my question: A 24.0 cm -long wire with a linear density of 20.0 g/m passes across the open end of an 89.0 cm-long open-closed tube of air. If the wire, which is fixed at both ends, vibrates at its fundamental frequency, the sound wave it generates excites the second vibrational mode...

How do u calc pressure at each end of pipe if u know its turbulent and u don't know the length. Just got viscosity, density, temp diff at one end, D. Cheers.

I recently invented a new application for vortex tube. The application requires a very minimal flow of air at freezing temperature. I wonder if it's possible to design a vortex tube at a very small size if only a very tiny air flow is required? Is flow rate proportional to physical size...

Homework Statement Light enters a solid 90 degree angled tube made of plastic having an index of refraction of 1.60. The light travels parallel to the upper part of the tube. which is horizontal You want to cut the corner of the tube so that all the light will reflect back into the tube...

Hey everyone, I just got an idea today surfing the web on Wikipedia. I noticed that in Berlin (i think there) they have these light tubes that stick out of the ground that take the light from the sun outside and the light goes through the tube and lights up the subway system. I thought it was...

Anyone familiar with GM tube, please share some experience on the effect of temperature to GM tube performance, how does it influence? I found our GM tube tally has increase a little as the temperature increased rapidly from 4 degree to 55 degree, I wonder is it a casualness or a indication of...

Hello All, I'm working on a three-channel tube amplifier for some experiments I'm doing (and later on, my keyboard :biggrin: ) and I was wondering if the nice people here could give me some tips for the circuit construction. I've already ordered a bunch of 6au6 tubes (because they were 50...

Let's say there is a U-shaped tube, both ends of the tube open, filled with some fluid. The fluid is still because the atmospheric pressure pushing on both openings of the tube are the same. Suppose the column of fluid, when streched into a straight-tube, measures x. Given any cross-section...

Homework Statement A plastic tube 25.0 m long and 4.00 cm in diameter is dipped into a silver solution, depositing a layer of silver 0.100 mm thick uniformly over the outer surface of the tube. If this coated tube is then connected across a 12.0-V battery, what will be the current...

If I know air is flowing through a tube with diameter of 40 cm at 18 m/s, with P=1 atm, T=32 C how do I find the mass flow rate..thank you

Homework Statement A very long conducting tube (hollow cylinder) has inner radius a and outer radius b. It carries charge per unit length +alpha , where alpha is a positive constant with units of C/m. A line of charge lies along the axis of the tube. The line of charge has charge per unit...

Hello, I am new to this forum. I read the thread about the water flow in a rectangular tube because I wanted to correlate what was being said into my own problem. My question I believe is very simple: I have a rectangular tube that has inner dividers, let's say that my tube has 6...

Homework Statement In a typical television tube, the electrons are accelerated through a potential difference of 25,000 volts. a) What speed do the electrons have when they strike the screen? And b) What is their kinetic energy in joules?Homework Equations K_m_a_x = hf - \varphi KE = \gamma...

I have two tubes. Both are 12 feet long. One is 4" diameter for its entire length. The other has a 4" diameter segment for 4 feet, expands to 5" diameter for 4 feet, then reduces back to 4" for the remaining 4 feet. If the same sound is injected into both tubes, will the sound exiting the...

Find: Flow rate of water through square tube Given: Cross-sectional wall and area of square tube, A=w^2 Length of square tube, L Pressure at start, P1 Pressure at finish, P2 Water *** If you need specifics I am pushing water (room temp) at 1 bar through 1200mm of square tube that...

Homework Statement Trying to magnetize water in a test tube so that it will move or pick up iron shaving(s) Homework Equations none The Attempt at a Solution Wrapped test tube with magnetic wire (500 turns) wire is connected to DC current of 122 volts. It will pick up iron...

Homework Statement You blow across the open mouth of an empty test tube and produce the fundamental standing wave of the air column inside the test tube. The speed of sound in air is 344 m/s and the test tube acts as a stopped pipe. If the length of the air column in the test tube is 14.0...

Homework Statement I'm stuck on a problem. If you have a 1'' diameter tube running vertically about 7 feet in the air and 5 feet of the tube was full of water. And at the top of the tube was closed off. And the 2 feet above the water had a vacuum pressure of negative 1 psi.(I don't know...

Hey, How does a Tube Magnet's magnetic field differ from that of a normal bar magnet? What effect does the cylinderical shape and the hole through the center have on the the magnetic field. Also, i was wondering: If you were to put a long iron rod (round) through the center of a tube...

Why is the end of the hot filament where negatively charged electrons are being fired called the cathode end. 'cat' in chemistry means positive, I assume the same goes in physics as well?

I don't have a diagram for this, so I'm going to do my best to describe it. A glass tube lying horizontally has three different cross-sectional areas, A, B and C. Area A is 12 cm^2, B is 5.6 cm^2, and C is 6.0 cm^2. Mercury (density = 13,600 kg/m^3) is being pushed through the tube by a...

Hello physics community! After working on this problem for more than 4 hours and reading about the topic in different books, I decided to ask here for help since I do not seem to have a clue. "A counting tube for a particle accelerator consists of a thin-walled metal tube and a wire that...

It seems that amps using vacuum tubes are becoming more and more popular with musicians these days. They're a bit expensive, at least the models I've seen, and the claim is that these vacuum tube amps produce a better sound or a richer sound. I was wondering if there was a physics-based...

Hey all; None of my EE classes cover vac tubes since they're largely obsolete. The thing is, for my senior design project (I have a year or so, no rush.) I'd like to build an audio amplifier. From experience I know the advantages of vac tubes and am willing to put up with the drawbacks...

Why it would be unwise to almost completely fill a test tube with HCL solution before adding a piece of metal? Is it because it's a acidic solution? Thanks

have anybody heared about the vortex tube?its an air cooler tube without any moving parts,and there is a link where u can get a little info about it http://www.visi.com/~darus/hilsch/ my ques: 1-could the nozzle be straigh?(const cross section? 2-which materila i should use to design this...

if i put two pipes in atank of some liquid and fill it up, will the height of the liquid be different in the pipes if the radios will be different? if not how can i create asituation so the height of the liquid will be different?

Hey everyone! I have a project going on with a friend...a hifi tube amp! yeehaw! Im going to start small the 60 watt range (30 per channel) and am wondering if anyone has any recommended reading for tube amp circuits, i need a book that gets right down into the dirt of tubes so that i can...

Well, i have been doing some fluids problems, and i came upon this. It has me stuck A T-shaped tube with a constriction is inserted in a vessel containing a liquid. What happens if air is blown through the tub from the left? A) The liquid level in the tube rises above the surface of the...

An aluminum tube with an outside diameter of 1,000 in. will be used to support a 10-kip load. If the axial stress in the member must be limited to 30 ksi T or C, determine the wall thickness required for the tube. I used tau=shearing stress/area therefore 30(pie times 1-d)=10 but that is not...

Why is the GM tube polarised? What benefit comes from having the anode at the centre of the tube? What happens if you reverse the polarity?

I want to design a tubing system using flexible PVC (1/2" diameter) tubing that carries water in a loop. Obviously there is a pump too, but that's not the focus here. What I want is a way to get all the air out, so that the loop contains only water. There is the idea of a "fill port", where...

Here is a question i can't figure out, it's a challange question we suppose to research.. Question: to measure acceleration, a bent arc-shaped sealed glass tube filled wtih water is used. there is a little air bubble inside. Explain the method of measurement in detail, and find the relationship...

I did a physics lab about diffraction grating where we had to determine the angular positions of all spectral lines of the helium discharge tube. I have 3 questions : 1. Why use a discharge tube instead of a light bulb? - I think it might be because you would have to break up the white...

Hi, Got to the last question in my mechanics problems list and just can't get it! You have a brass tube with steel bar inside. The brass tube is 400.12mm long; longer than the steel bar which is 400mm long. You have to calculate the stress in both objects when a compression load of...

Ok I got this problem here... http://img.photobucket.com/albums/v81/Veto1024/mercury.jpg How is this possible?! If its pushing the mercury down the tube and back up into the atmosphere, the pressure has to be greater then 1atm yet the answer ends up being less then 1 atm inside the...

Hi to you all.i have an exercise i cannot solve.i think something is missing. Cylindrical tube V=10L opened at the top has air with a temperature of T1=27 oC.We provide heat to the tube until the temperature reaches the value of T2=327 oC.A)we have to find the amount of air that leaves from...

Can someone please explain to me the difference between a cathode ray tube and a magnetron? I just started using a magnetron for sputter deposition in a project for a prof, and after reading about it, it seems to be the same. Just wondering, even though it may be a stupid question! Thanks!

Technically, this isn’t really a home work problem, per se, but let’s try to solve it anyway, shall we. We have a cylinder which at one end is closed off and at the other it is open. This cylinder has a total height H cm and diameter D cm (the real numbers aren’t all that important)...

How fast can Hydrogen be pushed threw a 1/16" tube? we have a maximun pressure diffrence of about 50PSI from one side of the tube to the other. And how can I calculate the reynolds number for the tube?

A 100 g ball is attached to a rubber tube and is spun around in a circle at a rate of one revolution every second. A force of 0.5 N is required to stretch the tube 1.0 cm. If the original length is L = 1.0 m, what will be the change in length of the rubber tube when the ball is revolving...

How do you calculate the minimum bend radious for a tube? Its a SS tube and we want to bend as small a radius as possible...

An object is put in a test tube . The test tube is put in a centrifugal machine where it spins around. Would it be correct to say that the net force on the object is zero since it is not moving. I know the test tube has a net inward force that makes it change direction. But the object wants to...

Hello, Supose you have an U tube, in which the inner walls are made absolutelly reflective. Now, put a termical state (temperature T) for the radiation field inside the tube and close it with reflective discs which can slide without friction. Supose further that de diameter of the tube in its...

I`m a little worried by the line "or look a bit foriegn"

Hello, I was looking for the name of the principle which governs the following- given a constant air flow- air moves faster through a tube with a smaller diameter than a tube with a larger diameter. Wouldn't you like to know what this has to do with singing? Thank you Debruyn

I was going though one of those aquariums where you can walk through a plastic tube and can see the sea creatures up close without getting wet. How could I find an approximate thickness of the tube just with my eye and something I can bring, like a flashlight, ruler, protractor, or whatever...