Tube Definition and 886 Threads

A section of an advertising sign consists of a long tube filled with neon gas having electrodes inside at both ends. A uniform electric field of 20 kN/C is set up between the electrodes, and neon ions accelerate along the length of the tube. Given that the ions each have a mass of 3.35 X 10-26kg...

Homework Statement A sound wave of the form s = sm cos(kx - ωt + φ) travels at 347 m/s through air in a long horizontal tube. At one instant, air molecule A at x = 2.04 m is at its maximum positive displacement of 6.40 nm and air molecule B at x = 2.08 m is at a positive displacement of 2.10...

Homework Statement A brass tube of mass 20 kg and length 1.1 m is closed at one end. A wire of mass 9.6 g and length 0.4 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...

Sorry if this is the wrong forum, I wondered if this belonged in one of the astronomy related sections but I don't know much about physics, I've never even taken a physics class. I constantly daydream about random stuff, and I thought up something the other day that was been bothering me...

To moderator - I had mistakenly posted this to the "General Physics" forum and later noticed the note about not posting there - sorry! I hope this is the correct location for posting the following question. I am a novice on this site and am trying to find an answer to a question which is: I...

Homework Statement The figure from the link below shows a cross section of a cathode ray tube. An electron in the tube initially moves horizontally in the plane of the cross section at a speed of 2.0 x 107 meters per second. The electron is deflected upward by a magnetic field that has a...

Hi, Have some query on the photomultiplier tube saturation limit(the maximum light luminosity or intensity that can be delivered to the PMT without damaging the equipment). How do we calculate it? I have looked through the specification. The only relevant specification for the saturation...

Homework Statement I had a discussion with some of my friends about this matter, but my physics basics related to fluid flow dynamics aren't well enough to draw a conclusion, so here it is: On the left side of the diagram is a space with infinite amount of air (breathable Earth air) at...

Homework Statement A tube closed at one end and open at the other has a fundamental frequency of 242 Hz. What is the fundamental whenboth are open? Homework Equations f (open and closed) = v/4L f (open) = v/2L v sound = 343 m/s The Attempt at a Solution f1 (open and closed) =...

Homework Statement Imagine a row of many small volumes of air (each consisting of many billions of molecules) along the entire length of a tube that is open at one end. Describe the motion of these small volumes of air when the standing wave, represented by Fig2 (sound wave in a closed tube)...

How would you calculate the cutoff frequency of an x-ray tube operating at 44kV? I am using frequency = work function/h. I have (44000eV x 1.602E-19J)/1.626E-34 but my answer is wrong. I'm thinking that I converted kV to eV incorrectly, but I'm not sure. Thanks.

I am getting ready to make a tube preamp to drive a Leslie speaker. I want to use a 12AX7 and 12BH7. I plan on using both triodes of the 12AX7 and possibly both oh the 12BH7. I have two questions: First, any design suggestions would be greatly appreciated. Any schematics would be GREAT! and...

Homework Statement What am I doing wrong in this pressure problem? a U-shaped tube is filled with water. left side area of opening is .05m^2 right side is .08m^2 the right side water level is .43m HIGHER than the left side, because two pistons push down on either side with different force...

Homework Statement COCL4 + 6H2 <=> Co(H20) +4CL blue <=> pink Question: Add a very small amount of AgNO3 to test tube #6. Stopper the test tube and shake. The solution in test tube turned pink, so I interpreted that as a shift to the products. Also, a precipitate (proper term? a...

For a Physics project my group and I are trying to build a Rubens tube. It is a device that shows the standing waves inside a closed-closed tube using fire. We are putting a small speaker inside a pvc pipe that is perforated on the top with holes. We will then fill the tube with propane and...

Hi All: I plan on producing a laboratory tube furnace capable of = to or > 1300 C. Does anyone have any experience working with materials designed for these temps? I have been pricing Mullite tubes: 500 mm L; ~34 ID; ~40mm OD, 18 G Kanthal A-1 wire (to be wrapped around the tube), Kaowool...

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 A ring should be mounted on a solid shaft. The rings inner diameter is smaller than than the shaft diamater so it will be forced on. for my problem the inner diamater for the ring is 90mm -50 \mum the shaft is 90mm + 20\mum so there can be a difference of 110 \mum. This should...

Homework Statement A 1.0--tall vertical tube is filled with 20 water. A tuning fork vibrating at 573 is held just over the top of the tube as the water is slowly drained from the bottom. At what water heights, measured from the bottom of the tube, will there be a standing wave in the tube...

Homework Statement Imagine a cylinder of radius R and Length L. Both of it's ends are open and it carries a uniform surface charge desnity of sigma (@) Find the electric potential at any point along the axis of the cylinder, and then use that to calculate the electric field at any point...

Homework Statement An alpha particle (a helium nucleus) is traveling along the positive x-axis at 1425 m/s when it enters a cylindrical tube of radius 0.700 m centered on the x-axis. Inside the tube is a uniform electric field of 5.00x10-4 N/C pointing in the negative y-direction. How far does...

Am I correct in stating that the number of *anti nodes* in a STRING denotes the harmonic and the number of *nodes* in a OPEN TUBE denotes the harmonic? -Thanks

I want to learn how to calculate what distance a fluid will travel up a small tube if a large piston is used on one side, and no piston on the other side. Example Diagram (Consider everything is square instead of round, for easier measurements.) Assume there is a 10kg mass placed on a...

If you have a tube with no air in it, making the the tube a vacuum. And stuck one end in space and the other end in the Earth's ocean. Then Opened both ends. Would it suck all the water out into space? If not what would happen?

Just received a Celestron 130 SLT for Christmas. I haven't had a chance to use it yet due to clouds and winds. I live 15 miles east of Cleveland,OH. Anyways, my question is: what is the purpose of the 2" cap/hole on the 5" tube cap? Thanks, Joe

Homework Statement A tube of length L = 25 m that is open at one end contains air at atmospheric pressure. This is done in Denver so atmospheric pressure P = .667 X (1.10 X 105 Pa). The tube is thrust vertically into a freshwater lake until water rises halfway up in the pipe. Find the depth...

It is 2 days before final exam and I don't even know how to solve this. I am so screwed.Homework Statement http://img201.imageshack.us/img201/9822/picture1ap8.png (The answers written above are supposed to be the correct answers.)Homework Equations P + (1/2)pv2 + pgh = constantThe Attempt at a...

Hello, I would like to know how to select the radius of a pitot static tube to test the air flow in side a circular tube?? Thanks in advence.

Regarded oxygen separation from superheated steam using a multiple reactor tube Superheated steam is passed through a black iron pipe set within a fire core heated to 1, 800'F. A carbon rod is inserted into the black pipe. A tap extends perpendicular to the black pipe where waste oil is...

dear all, i have just received a question about torsion. Homework Statement *************** a graph has been attached as attachment at bottom************* The objective is to find the torsion shear stress at the cross section of the "dark Grey tube". Let's have a look: 1.There is a...

-snip- problem solved, nevermind

could anyone explain why the mercury vapour inside a fluorescent light tube is kept at a low pressure and the purpose of the coating on the inside of the tube? thanks marco

For internal forced convection in a circular duct, exact solution is available for h, for both constant surface temperature & constant surface flux, Nu being 3.66 for former & 4.36 for latter. Now if I have a double tube heat exchanger, with inner tube with hot water & annulus with cold water &...

Consider a scenario of a sound wave inside a closed end and opened end tube. We always learn that the displacement amplitude at the closed end is always zero but at the opened end is always maximum. My friend can see it quite intuitively. For the closed end, we expect there is no...

Dear All, I have received 2D drawings of Tube Fitting Parts. I need to create the model and assign the properties. I like to know how to assign the end styles for different Tubing Parts and how to define the connector (tubing) points. Any help is highly appreciated. Thanks in...

I'm doing an acoustics lab, and I have a tweeter which is making sounds into a tube with a piston in it, i move the piston to different positon, and measure the distance " X ". "X " is the distance between the initial and reflected pulses. I then found time ( T ) by multiplying my "X" by the...

Homework Statement Electrons in a TV tube are accelerated from rest through a 25-kV potential difference. With what speed do they hit the TV? V = 25*10^3 J/C Homework Equations I'm not really sure here. I'm thinking you have to use Newtonian mechanics somewhere here. So, x(t) =...

Homework Statement A U tube of uniform cross sectional area A and base length 'L' contains a liquid of density "p". It is rotated about one of its vertical limbs with constant angular velocity \omega. If the diameter of the tube is small compared to the base length, find the difference in...

Hi all,my question is on dynodes. For ex: in scintillation detector we ususally say that a visible photon when incident on photocathode,undergoes photoelectric effect.But what the process occurring on dynodes when this photoelectron incident on it. Electrons are multiplying successively as...

Homework Statement A plastic tube 25m long and 4cm in diameter is dipped into a silver solution, resulting in a layer of silver being deposited 0.1mm think uniformly over the outer surface of the plastic tube. The coated tube is then connected across a 12V battery. Calculate the current...

To anyone familiar with the Ranque-Hilsch vortex tube: Say if the cooled air is allowed to pass over the vortex section of this tube, what would happen? Would the effect of cooling be the destruction of the vortex? or would it act to further decrease the temperature of the cold exhaust?

This is more like personal homework and I have searched everywhere to find the answer to this with no luck. I was watching mythbusters re-runs the other night and the hurricane episode was on. They were trying to prove that straw could go through a tree in hurricane force winds. What...

Homework Statement Immediately outside a very long cylindrical wire of radius r1 = 1mm, the electric field is 40kV/m directed towards the wire's surface. A hollow cylindrical metal tube with inner radius r2 = 3mm is now placed around the wire, to form a coaxial cable. What will be the charge...

So... let's say I wanted to drop a pipe on the ocean floor with a 6" inner diameter... which has a pretty strong vacuum in it... what general size/material do you suppose that would require... assume it is miles long. I guess you could keep the vacuum pipe inside of another pipe that does not...

I am on home oxygen and receive the gas through a 50feet long tube about .1" inside diameter.If the Machine delivers a flow rate of two liters per second, what is the pressure drop through the tubing; What is the flow rate at my end of the tubing?

How would i work out the load baring strength difference between a hollow tube and a tube, with a x section throughout the length?(as per thread bellow) http://i323.photobucket.com/albums/nn463/pharllap/endview.jpg I love designing things and in this case I'm asking in respect to space...

Hi all. my question is about the implantation of an harmonic mode inside a tube closed at one end and opened at the other. A mono frequency source of sound is directed to the opened end of the tube. Inside the tube, besides air there is a soft powder. As the correct frequency is found, the...

Homework Statement A long thin tube of negligible mass is pivoted so it may rotate freely without friction in a horizontal plane. A thin rod of mass M and length L lies in the tube and can slide without friction in the tube. (I_{Thin Rod}=\frac{1}{12}ML^{2}). Find the equations of motion...

Hi All, I have searched in some places but ´had no success in finding an explanation to the appearance of striae in the vibrations of the kundt tube. The powder vibrates as a response to an incoming sound wave front, and show a larger patern which is nicely explained by the theory of open...

what is T45 tube made of? i have been on lots of websites and all i have gathered is that T45 is a type of tube (british standard) not a type of material. i really want to find a good data sheet of all the info about this material for finite ellement analysis. i need poisons ratio, ultimate...