Tube Definition and 829 Threads

I am a chemical engineer, not a physicist, so I am a bit rusty on my electromagnetics. I need to set up a fluctuating magnetic field inside of a stainless steel tube (hopefully using a pair of electromagnets outside the tube), and I am wondering if the field will penentrate through the tube...

Homework Statement Mercury is poured into a U tube. The left arm of the tube has a cross sectional area A_1 of 10 cm^2 and the right arm has a cross sectional area A_2 of 5 cm^2. One hundred grams of water are then poured into the right arm of the tube. A: Determine the length of the...

For the classic Lenz law demonstration using a neo. magnet dropped down a copper pipe, is the magnetic force generated correlated to the thickness of the copper pipe? Ergo, will the magnet go slower down a thick copper pipe vs. a standard size plumber pipe?

Problem: Determine the quantity of resonant frequencies that a 1024 Hz tuning fork will have in a 1m long tube with an adjustable water level. Find the length of the air column for each frequency. Assume the speed of sound is 344m/s. Solution: The resonant frequencies are odd integer...

Hello and thanks! I apologize in advance if I picked the wrong place to post this thread. I'm a high school student building a Rubens tube and have encountered a problem: I have a one inch outside diameter aluminum tube. It turns out that the one inch copper reducer and PTC I bought is...

I’m designing and hope to build a human powered helicopter (HPH) and am wondering if pressurising a thin walled aluminium tube by filling it with compressed air would strengthen it’s structural properties. Hope this is the right place to post this.

Hi, I wasn't actually sure where I should post this. I am trying am experiment where I need to briefly break the surface tension of a droplet to then allow another droplet to form in it's place. I don't want to use any chemicals as that would effect the test further down the line. Is...

Hi, I wasn't actually sure where I should post this. I am trying am experiment where I need to briefly break the surface tension of a droplet to then allow another droplet to form in it's place. I don't want to use any chemicals as that would effect the test further down the line. Is...

Hello everyone! I'm in high school and attempting to build a ruben's tube. I am on a very strict budget and came across free brass tubing, but the diameter is 1 inch. All the tutorials I've seen use a diameter of at least 2inches if not more. Will a pipe with a one inch diameter work...

Homework Statement abstract question, but we can assume the volume,V to be filled is 0.0001m3 and time for it to filled up water is 60seconds, water density is 1000kg/m3, so how much should be the cross sectional area,A for the tube?Homework Equations Volume flow rate=delta Volume/delta time...

Homework Statement If we drop a bar magnet down a copper tube, it will travel down very slowly. If we now cut vertical slits in the copper tube, will the magnet travel down faster or slower as compared to the original problem? Homework Equations \int \vec E \cdot d \vec l = -\frac{d...

So that's the question and I'm stuck on Part b. I don't even know how to approach it. I know A1= 3A2 but I don't know A1 and I need V2 and I don't know V1 or A2. I'm just confused as to how to do this. Please help!

Homework Statement Kundt's Tube.First of all, i used a aluminum rod. Then i rubbed it to cause vibration . Homework Equations a)How can i change the frequency of the sound produced in tube. b)What is the difference of rubbing the metal with more pressure?The Attempt at a Solution a)...

Hi everyone, just me doing my regular Thursday Physics homework and looking for someone to check my work. Homework Statement A tuning fork with a frequency of f=528Hz is placed near the top of a tube. The water level is lowered so that the length L slowly increases from an initial value of...

I have been told to calculate the pressure drop between two points in a pipe carrying water using a U-tube manometer. I understand that the pressure drop (P1 - P2) is given by pgh and that h is the difference in manometer fluid levels and g is gravity, but is p the density of the manometer...

Why do we assume that an antinode is present at open end of a tube? Can a node be possible at open end? Thank you in advanced.

Homework Statement I'm trying to figure out and explanation as to why a strong magnet drops so slowly through a non-magnetic but conducting Cu tube. The attached diagram shows the original B field, induced Eddy currents, and secondary B field as a result of those Eddy currents, but I can't...

I know the basic equations for airflow, but for some reason this question has been puzzling me: say you have a copper tube open at one end and connected to a piston cylinder system at the other. Air is drawn through the copper tube and into the cylinder as the piston moves from top to bottom...

Homework Statement A tube of uniform cross-section A is bent to form a circular arc of radius R, forming three quarters of a circle. A liquid of density \rho is forced through the tube with a linear speed v. Find the net force exerted by the liquid on the tube. 2. The attempt at a solution...

Ok, so if I have a square that is exactly 10 inches by 10 inches, then the surface area is 100 square inches exactly. But if I roll up that square into a tube and calculate its surface area, it's 2∏r times the length. And since the calculation involves ∏, that means I won't get an exact answer...

Homework Statement Two balls, one soaked in concentrated HCl and the other in NH4OH are placed at the left and right ends of a 1m long evacuated glass tube, respectively. HCl and ammonia vaporize and travel down the tube, reacting to form a white ring where they meet. Where does the ring form...

Hi! I have this experiment, that keeps getting me frustrated. The experiment is simple: We have hot water and a long plastic tube with one end closed. We simply measure how much water is in the tube and from that we get the water volume (water is in cylinder shape). But there is something I...

Hi, this is my first post here. I know that, according to Lenz's law, if you drop a magnet inside a copper tube and let it fall, its movement will cause an induced current, which will slow it down in turn. However, my drawings make me believe that the direction of such current should be one...

Does anyone know what the equations governing the effects of whistling in a convoluted tube as air passes trough it are? I didn't know it was called this until today, but a convoluted tube is the real name for what many cable management tubes are. These tubes are also used in medicine for things...

Accoustic Resonance of an open tube -- help please So I am trying to make sense of the different varying formulas that I have found. Some of the formulas are not fully explained hence my questions. This is a music related topic. I am attempting to figure out what the formula is to determine...

Hello everyone, I just found this site and I'm really hoping to find an answer to my problem! As the title tells my problem is this: I'm working on a project with pitot-static tube and I'm wondering how to get the tube correctly placed in a wind tunnel. Every guidance I can find just says pitot...

Homework Statement One charged plastic ball is vertically above another in a test tube as shown. The balls are in equilibrium a distance "d" apart. If the mass of the upper ball is reduced by a factor of four, the distance between the balls in the test tube would become : 1) 4d 2) 8d 3)...

If you have a tube and a solid cylinder of the same dimensions and density and rolled them down an inclined plane the 'tube' would cover the same distance in less time?

There is a common free fall demonstration that involves a long evacuated cylinder, a coin, and a feather. The tube is plexiglass and so the fall of the coin and feather can easily be seen as synchronized. I'd like to put one of these together, but was curious about the vacuum needed for a...

Homework Statement A liquid initially fills the inside of a vertical tube of length L and inside diameter D. The tube is capped at both ends. Then the caps are suddenly removed, and the liquid flows out of the bottom of the tube as a continuous stream until the tube is nearly empty. Assume...

Homework Statement When the pressure of the gas in a discharge tube is gradually lowered I. There is a violet glow in the tube II. The glow in the tube split into bands which get further apart III. The glow and the bands eventually disappear and there is a green flourescence in the tube...

I'm very interested in building this cool device, and was wondering if water could be used instead of air as the injected fluid. The main differences I notice are the much larger density, and thus possibly smaller angular velocity. And higher viscosity, which could mean a smaller radial...

I am running hot air through a copper tube that is inside a chest freezer. I would like to encase the copper tube in a coolant that will help cool the air in the tube and was wondering which of these 2 would work better, water mixed with antifreeze at a temperature of 0 degrees F, or Ice at 0...

Hi, I'm trying to measure how far a rod that passes through a tube is offset from the center. Assume that the axis of the tube runs parallel to that of the rod. I can only access the interior of the tube from above (it hangs vertically), and the access hole I have is smaller than the radius...

Homework Statement A closed tube resonates at 440 Hz when it is 0.195 m long and 0.586 m long. Determine the speed of sound. How do I do this? Homework Equations wavelength=4L v=fw The Attempt at a Solution v= 440 (4L) I'm just not sure how to use both lengths given, can someone...

In a video demonstration (not animation), cathode rays appear as a beam of green light moving from the cathode to anode inside the tube. The demonstrator brings a magnet near the tube and the green beam deflects. This I can understand. What I can not understand is that how the electron beam...

Homework Statement I don't really understand something in my textbook. It says the heat Resistor (how to say that in English? I hope it's alright like this...) trough a cylindrical tube (from the inside to the outside or revers) would be: R(heatrisistor)=1/2∏Lλ * ln (R1/R2) And then my...

Hello, Have you ever drank through a straw? Notice how there is always drink left at the end that you can't drink? I believe the volume of this liquid is the same as the volume of the bore of the straw. Now, my question is; Is there a way of pumping a small amount of liquid (2-5ml) over a...

Homework Statement I have a magnetic ball with magnetization M, mass m and radius R that starts to fall from rest through conducting tube of radius a little big larger than R, thickness \Delta and conductivity \sigma. The ball is not rotating, it said that magnetization is oriented vertically...

Hi, I'm a little confused about the pressure in the inlet/outlet and the throat of a Venturi tube. Why is the pressure in the inlet/outlet greater than in the throat? I thought that because air is needed to flow into a smaller space so the pressure has to be greater? Pardon me. I've...

So I am trying to figure out how I can calculate the deflection and ultimate bending moment capacity of a hollow tube beam when the hollow portion is not concentric. A regular concentric tube is easy enough but this has me out of my depth. I assume that it will no longer be symetric in its...

Homework Statement In attached figure, a closed tube is placed near a string that is fixed at one end and has a weight attached to its other end. When bridges A and B are positioned at the points shown,plucking the string between A and B causes the tube to resonate at its fundamental...

hello! lets say we have a long tube with variable diameter and with variable direction is it possible to measure the diameter of its walls in each point of its lenght, by sending waves or something from its edge towards inside it ? imagine it is not possible to access the outside of the...

hello! I am interested to know if a tube can be created that with some kind of mechanism, its diameter will increase on demand the range of the diameter should start at the smallest possible (0.01 mm or less if possible, even if the walls of the tube virtually concur) and increase up to...

Hi everyone, I'm new to this site, so if I'm breaking any rules let me know. In particular because this is for my job. The forum rules seem very clear on the guidelines for homework for school and one can assume that personal hobbyist type questions aren't an issue but i don't see anything...

I have a US Navy "Plate and Filament Transformer" Manufactured by Hudson American Corporation. This monster weighs 14.5lbs, and is in a sealed steel casing. My output trans weighs 15.5lb as well. There are 16 unlabeled terminals, and I'm working to identify those. Suggestions on how to go...

Hey everyone, I'm going over my course content for an exam this Saturday and I'm a bit confused by a realisation I've just had. In a metallic waveguide we know there are no TEM modes. But wouldn't this mean that we couldn't see through metallic waveguides as we see electromagnetic radiation...

A hydraulic steel tube of diameter 10mm and wall thickness 1.5mm has been bent to a radius of 100mm. Calculate the reverse radius of curvature that needs to be applied to straighten the tube. M/I= σ/Y = E/R I am really struggling on the above question. I think I need to read off the...

This is my first post and I'll admit I probably don't even know enough to be dangerous. Any how what I have is a a 3' long 6" dia tube that is functioning as a muffler for a boat. It has two 4" dia inlets mounted perpandicular to the length of the tube at 28" on center and two 4" oulets mounted...

This is way outside my area. I have a 4" long 1/2" D. rod of 6/6 nylon, inside a mild steel tube. The application is all-weather. Length of rod travel is .70 to .75 inch. Light use, 20-50 actions per day. The application is an oddball latch release lever. Nylon was chosen because of cost...