Tube Definition and 829 Threads

I am working on designing a trailer that will hold a load of 350lbs on 2 centered posts. It needs to have a safety factor of 3, so 1050lbs plus trailer weight. I am trying to determine the size of Steel square tube I must use. Any advice on formulas or methods of determining this? I would...

Suppose I have a plasma. Inside the plasma is a knotted flux tube in an electric field. Will it tend to move? Is this there a better forum for this question?

Homework Statement I require the a means to theoretically calculate the spring constant of a hollow tube. Essentially, I need to find the diameter of the glass pipette which will have a spring constant of 100 Newtons/metre. If someone could point me towards relevant information on...

Homework Statement Water flows through a tapered tube. At one end of the tube, where the diameter is 20 mm, water flows in at a rate of 1.0 liter / s. At the other end, where the water flows out, the diameter is 15 mm. How large is the flow at that end? Homework Equations No equations...

Lets say we had a 10-stage linac accelerator and we were using a 200 kV supply. Apparently the K.E at stage 2 (in the second tube) is twice that of the first tube (stage 1). why is this?

1. I have an airless tube connected to a pot full of mercury. After opening the tap, marked as K, mercury grew up by height h and mass m. How much heat was released in this situation? P.S. I do not have any exact numbers or sizes...only variables... 2. Homework Equations none 3. All i did...

I'm interested in the theoretical minimum number, so like the extruded buckyball ball? I'm trying to work out if there are enough carbon atoms in a 'piece of paper' to reach the moon. :) Which brings me to the next question : how many carbon atoms are there in a piece of paper? Or...

Hi all, I am new to matlab, and I have a question (in page 2 and 3 of attached file). As I understand, i have some equations to calculate the thermal conductivity of the pipe-like solid, and I have to use Matlab to make a program to do it. But i don't know where to start? It may be easy...

Hi, In class we were discussing the effects of a two bar magnets being dropped through a copper tube at around the same time, with the same pole facing towards each other, so that the two magnets repel - would the magnets fall through the tube faster or slower than if only one was dropped...

Hello. Here joined is the schematic of a small deflection amplifier. Outputs H0 & H1 are connected to electrodes placed in a vacuum volume. These outputs are protected by varistors. High voltage to collectors is 200 V DC. Sometimes, not very often, the head Op-Amp (LM324) is burnt. The only...

Hello all, I've not posted in a long time, but I will start by thanking you for your input pertaining to my last posts (about ice). They were very helpful. I have a new small dilemma, and I hope you can give me some direction on how to resolve it. I have a small tray that collects...

Hi, Ive just joined as I've spent the last few months falling onto this site to try and help me in various bits and peices. I am however stuck on something. For part of my dissertation (automotive) I am introducing a brace into a subframe of a competing drift car. To save weight this is...

Homework Statement A Pitot-static probe connected to a water manometer is used to measure the velocity of air. If the deflection (the vertical distance between the fluid levels in the two arms) is 7.3 cm, determine the air velocity. Take the density of air to be 1.25 kg/m3. Homework...

Hi, I was hoping someone would be able to help me with a microscopy problem that has been puzzling me for a while. I'm building a basic microscope from scratch using a 50x long working distance Nikon objective (LU Plan ELWD, wd = 10.1mm, NA = 0.55). The sample is illuminated from above using...

Homework Statement Hey folks, here is a question: A thread of mercury of length 15cm is used to trap some air in a capillary tube with uniform cross-sectional area and closed at one end. With the tube vertical and the open end uppermost, the length of the trapped air collumn is 20cm...

I have been struggling to find my mistake for over 2 hours now and I still haven't exactly matched my answers with the books solution. I feel that my method should give the same answer the solution manual obtained however they are slightly off. I understand the book method completely. Can...

If a small tube (capillary tube) is dipped into the water, the water level rises. Which means someone is doing work on the water to rise it against gravity. My question is, who is doing this work? My guess is the internal energy of the molecules is doing the work. That also means that...

Does the water approach the maximum height in a capillary tube with 0 velocity?I mean to say that does it go to the maximum height and just stop or perform simple harmonic motion ?Water is in equilibrium but velocity need not be 0 or is it(why?).The expression we derive for h should be for...

It may sound like a silly question but I really need some help. Not with the maths, I know that's beyond me I'll plug the numbers into an online calculator when I know what it is is I should be doing and that's where I need you. The set up: A random length of 25mm square tube with a wall...

I want to drill a 3/8" hole in one side (not through) of a steel tube, 1-3/16" OD 1/16" wall tube in order to run cables through it. The tube is my son's go kart frame so I want to make sure it is safe to drill a hole into it. I'd appreciate any comments.

Homework Statement A tube of uniform cross-section is bent to form a circular arc of radius R, forming three quarters of a circle. A liquid of density ρ is forced through the tube with a linear speed 'v'. Find the net force exerted by the liquid on the tube. Homework Equations F =...

Homework Statement Ok so we have been given a diagram of a cathoe ray tube, with relevant data on it. The second question asks to "calculate the speed of the electron, using data from the first question". I need to make sure the answer is correct as it leads into many different questions...

Can someone please tell me if there is name for focusing the outside light to a point down a tube then magnifying it back showing the outside view? E.g. having the lenses focus on a hill side then focus down a 1 meter tube then enlarge onto wall. If there is no name for this what type of...

Homework Statement In a cathode ray tube (CRT) used in older television sets and oscilloscopes, a beam of electrons is steered to different placed on a phosphor screen, which glows at locations hit by electrons. The CRT is evacuated, so there are few gas molecules present for the electrons to...

Hello all, new member and amateur engineer from Tucson, AZ. I am working on a homebuilt, part 103 legal, ultralight project. I am trying to find the formula for deflection of an aluminum tube. I need to know how much weight will cause permanent deformation of a tube suspended between two points...

I found this equation for predicting the bending natural frequency of a tube but am having trouble working it out. I was hoping that someone might be willing to steer me in the right direction. First the equation and the info provided on the website: w = (B*l)2 * SQRT (E*I/(rho*l4)) w -...

Homework Statement If I drop a magnet through a long tube of copper how would the EMF vary with time? Homework Equations The Attempt at a Solution When the magnet enters the copper tube some of the magnetic flux lines are being cut hence an EMF is induced in the copper coil If we...

I know the default library of LTspice don't have vacuum tube model. Does anyone know where I can get one. If not, any other free spice program have vacuum tube models? The only one I find so far is: http://www.duncanamps.com/technical/ltspice.html I tried to follow the instruction and...

A well known physics experiment is dropping a magnet through a vertical aluminum tube. The magnet slows noticably before passing completely through the tube. Electrical current is created in the aluminum tube thereby creating a magnet thereby creating an opposing magnetic flux to slow down the...

Hello! Background I have a hobby in creating an automated home, controlling lights, reading temperatures, and so on from self build sensors and actuators. For a while I have had force sensing resistors under each leg of my bed so I can messaure my own weight every day, sleeping patterns and...

Hello, As we know, when you blow over the neck of a bottle, it resonates at a certain frequency. I want to build a cylinder that will resonate at a certain wind speed: 4 mph or about 1.78 m/s I definitely know how to find the resonant frequency of a cylinder. However, I'm not sure what...

Hey folks, here is a question: A thread of mercury of length 15cm is used to trap some air in a capillary tube with uniform cross-sectional area and closed at one end. With the tube vertical and the open end uppermost, the length of the trapped air collumn is 20cm. Calculate the length of the...

Test Tube Yeast Evolve Multicellularity The evolution of multicellular organisms have always been poorly understoond. Recently, scientists managed to demonstrate the evolution of multicellularity in yeast cells through artificial selection.

Hi all, Sorry if this seems trivial but I think I may have managed to confuse myself and could do with some help. I need to specify a tape heater power output for a small rig through which water will be heated to 200C. Having gone through the Q=m*cp*ΔT equation where: m = 0.1658x10-3...

I want to propose an interesting thought experiment, but don't want to A/ make a bigger fool of myself than I normally do B/ well that's about it really The premise behind my experiment is that rising steam does not lose thermal energy if we ignore thermal losses both radiative and conductive...

Hello there! I study communications engineering and got really fascinated by magnetic fields. I started to do my own bit of "research" or "further understanding" how magnets work, how the field is influenced and what can the field influence. After doing so I got fascinated by particle...

So, For FIRST FRC robotics, We have made 3 different objectives to research, and I decides to start with the projectile. We need to launch an 8" diameter foam basketball into a goal that's 18" diameter. We can be anywhere from 3feet to 54 feet away. We had an idea of using the classic...

Appreciate any comments regarding the following:-(I am not an Engineer) We intend to launch (Mekong River) the subject steel tube (12mtr pipe welded together using the collar sleeve method) Flanges / gasket will be fitted at both ends of the tube. The flanges will have a 1" valve at the top and...

Every one who can answer these 3 questions, help me to understand Physics better.It also help other people who are interested in physics. 1-Imagine you want to drink a glass of water with a straw.Where is better to put the tube for drinking water better? 2-Boats which have engine lurch and the...

A large open tank, shown below, contains water at a height H. The water is allowed to flow out through a pipe whose cross-sectional area is A. The pipe has a nozzle at the end, whose area is a. Assuming frictionless flow, determine (i) the height h to which the water rises in the piezometer...

Given the following: 1. A hollow tube 0.875" O.D. with a 0.750" I.D. 2. A clam shell circular clamp 0.875" wide. 3. Two No. 8-32 screws securing the 2 halves of the clamp onto the tube. 4. Screws are torqued to 20 lb-in. I am looking for how much weight that can be supported by the...

Hey guys, Im designing a system where water flows through a copper tube or coil where it is heated and sprayed out the other end. My question is, how does the length of the tube/coil play a role in this heat transfer problem? What I would like to do is pass the water through the inlet at a...

Homework Statement A constricted horizontal tube of radius r1 = 4.00cm tapers to a tube of radius r2 = 2.50cm. If water flows at a speed 3.50m/s in the larger tube, (A) find its speed in the smaller tube. (b) Find the water pressure difference ΔP=ΔP1-ΔP2 in kPa and in atm. Homework...

Homework Statement We have a U tube, like this one: With the a nonviscous, incompressible fluid at height h at equilibrium. We're interested in finding the frequency of small oscillations about the equilibrium. The tubes have area A (though I'm guessing this falls out in the end) and are L...

- A tube around a manifold embedded in Euclidean space is a manifold with boundary. Is the tube always orientable? - Does the topology of the boundary determine the topology of the tube?

Anyone know how to use the temperature gradient in a thick-walled tube to calculate the stress seen throughout the wall (radial stress gradient)? I've been scouring the internet for a good explanation but haven't found one.

Homework Statement The U-tube in the figure is sealed at both ends. It contains a gas in A, another gas in B, and mercury in C. The heights of the mercury in the two arms are as shown. The density of mercury is 13.6 g/cm3. If the pressure in A is 1 × 10^4 dyn/cm2, the pressure in B is...

Hi, I am trying to build a high-speed flash, based on the PCB from a disposable camera, with the aim of producing a flash with a duration of 5μs - 20μs. The main circuit works, firing four xenon flash tubes from a 330v capacitor (charged to 300v). This is the schematic for the disposable...

We were presented with a task of calculating the temperature of absolute zero experimentally. To do this, we were given a capillary tube with one end sealed. Then we heated the tube up in a bunsen burner and quickly put the open end in some cooking oil. The oil was sucked up as the gas within...

Homework Statement The horizontal pipe, shown in the figure, has a cross-sectional area of 40,0 cm^{2} at the wider portions and 10,0 cm^{2} at the constriction. Water is flowing in the pipe, and the discharge from the pipe is 6,00*10^{-3}\frac{m^{3}}{s} (6,00\frac{L}{s}). The density of...