Tube Definition and 886 Threads

So first I converted the density from g/cm^3 to kg/cm^3 (it wants the answer in cm). This gives me a density of 0.01356 kg/cm^3. Then I thought about the relationship of pressure and temperature. Since volume remains constant and temperature is the only variable changing, the change in pressure...

The answer is suppose to be 0.9432. Initially I thought the pressure inside the glass ball would just be the same as the atmospheric pressure because these equal pressures would cancel each other out, but obviously that's not true. I can calculate the density of the gas using the equation...

I don't seem to be able to comment on you tube videos. It doesn't give me an error message, there is a greyed out box that says "confirmation", but no hint as to what's wrong. I see one other comment on the video, so I assume comments are open. I don't see any hint as to where to get...

This is for a campervan project I am working on, I am trying to take outside air that is cold (Canadian winter) and mix it into the return air in my diesel heater. I need to hit a specific minimal CFM to maintain proper Co2 levels inside and I would like to be able to calculate this. The axial...

To measure the atomic hydrogen spectrum people often uses hydrogen gas tubes as light source. Since the gas in the tube is the molecule ##H_2## , why we obtain the spectrum of atomic hydrogen? My guess is that because the voltage is so high, so that the molecules are totally dissociated. If...

hi guys i have an assigment of deriving the current between the plates of a vacuum tube as a function of the potential bias applied on the upper plate from what i had found this relation is called Child-Langmuir law and states that : $$I = K V_{d}^{3/2}$$ from what i find online i can derive it...

By Classic Coulomb's Law there exists negligible yet non zero force of attraction between two unlike charges in-spite of the distance. However for electrostatic attraction to work we need at-least one Faraday Tube(Lines of Forces) between the attracting charges, does that means...

Build a tube to space. Use our atmosphere to push a ship up the tube.

I have an interesting(IMHO) approach to explaining how the vortex tube works. There are a few explanations on wiki, but not a simple and convincing final one. https://en.wikipedia.org/wiki/Vortex_tube Normally a vortex tube, that runs well, howls very loud. It is a kind of aerodynamically...

I hope you guys don't mind a bizarre question from a novice. I've learned just enough about fluid dynamics to be dangerous. Assume that we have a straight, rigid tube with a constant inner diameter. It's not long, let's say it's around a foot (in case that matters). We cut a chunk out of the...

hi guys I'm really struggling to get the expression for average speed in turbulent flow The book explains absolutely nothing about how the integration is carried out, in addition to the fact that the logarithmic term becomes undefined when r = R what I did was carry out the integration up to...

The problem is easy to solve, the question i have is another about static. Why when we get: F = (-A*p*γ/l)y Can't we just substitute p*a = m*g? If this is a oscillation, it will be about some equilibrium position, where the net force is zero and which was the initial position of the body, in...

Hi all, I hope this is the correct place to post this. Below is a section of a pipe. The pipe has a radius of 0.848 m. For this example, assume the pipe is buried below ground but a section of it remains exposed. The centre of the pipe is buried 0.590 mbelow the ground. If we assume the pipe...

Hi: Due to the quarantine I have more free time, I've decided to learn more about electron tubes. Currently, I'm trying to understand how the Barkhausen–Kurz electron oscillator works. Now, I've been able to understand the calculation of electron motion inside the device and why they...

Hi there! This is my first post here - glad to be involved with what seems like a great community! I'm trying to understand the acoustics of a finite plane-wave tube terminated by arbitrary impedances at both ends. So far all of the treatments I've managed seem only to address a different...

Yes, pressure is same along the line for both the tubes since the liquids are in equlibrium. (I ignore the slightly longer air column in the left compared to the right). Is my answer correct?

Hi, just reviewing some thermodynamics from the textbook by Sears and Salinger, having a hard time conceptualizing this one. It's an isothermal change in pressure, so the volumes of the mercury and the air both change to reach equilibrium, but if it's a "good vacuum pump", then won't the right...

Red has the longest wavelength compared to the two other colours so the location of red will be at point C. x = 11.5 cm L = 30 cm d = 1870 nm Putting all into the formula, I get λ = 717 nm Where is my msitake? Thanks

Hi, after reading much interesting information on the subject I want to made a small project, the idea is to have a transparent plexiglass tube and a (diamagnetic?) material ball within the tube and to have permanent magnets outside the tube in such a way that I can suspend the ball so that it...

The tube I'm using is 6" long, 6" diameter and .5" wall thickness and made of 6061 aluminum. The bottom is a 6" diameter, 3/8" thick MIC6 Cast Aluminum Disc. The top I TRIED is a 6" diameter, 1/2" thick clear polycarbonate disc. Both top and bottom are bolted on with a 1/16" buna-n o-ring and...

I've been looking at the Hyperloop concept, where a low pressure sealed tube allows a pod to cruise intercity at around 700 mph, and Elon Musk's original whitepaper suggests excavating the track to about one sixth the pressure of the atmosphere on Mars. Atmospheric pressure on the tubes has...

Hello, How can I calculate the force that must be exerted on a ball inside a rubber tube? Thanks

I am certain this has been answered...but I missed it. Why do so many guitar players swear by TUBE amps? My son-in-law says they just sound better. Because I was a TV/Radio service tech for 20 years with a degree from Elkins Institute, he asks me why? My guess was, maybe amplifying a signal...

Hello: I am looking for a formula that can help me determine the collapse and deformation strengths of plastic tubing. I have been scouring the internet for this information and i have yet to find a satsifactory formula. I have found a formula that seems pretty wide spread ~ however it gives me...

Would an A36 steel tube filled with liquid mercury be able to transmit a shock wave longitudinally through the liquid mercury with a peak pressure higher than the yield strength of the steel tube? My thinking is that since the shock wave is traveling normal to the tube wall, it should not be...

It had a small button that I think was suppose to improve reception. What did that button do physically?

I guess I have to find out something when the tube is on the horizontal. What force should I consider? Is the pressure of the air inside still ##p_{atm}##? When it is on the vertical, the equation is something like this? ##P_{Hg}+p_{atm}*A=p_{atm}*A+ρ_{air}*A*(l_1-l_1')*g## with...

I'll call ##v_2## the flow speed on the horizontal tube and ##v_1## the lowering speed of the column. Even if the lowering speed isn't negligible, the problem says "...when the plug has been removed", so can I consider the height unchanged? In order to find the force, I need the pressure when...

Want to let the steel ball move upwards at a uniform speed, how is the torque of the spiral tube calculated? The parameters can be assumed by themselves. **The spiral tube is fixed on the central shaft, the central shaft is mounted in the ball bearing, and the thrust F acts perpendicularly on...

This is a problem from a past exam. For point a) the balance between force should be given by the following equation $$M*g+p_0*A=ρ*g*(A*d)+p*A$$ But I still have two unknown values... I know that pressure outside the tube at depth d is $$p(d)=p_0+ρ*g*d$$ and this has to be equal to the...

This is a deep well & the dimensions of the bottom chamber is 5x1x5ft which holds 187 gallons. The pump is located in this chamber with a piston/plunger only going up to the top of this chamber at 5ft. The pump pushes 187 gallons into a 6inch diameter pipe which is 1000ft long = 1,470 gallons...

The motor is required to operate at its resonance frequency and I am looking to add a thin-walled (0.010") copper tube inside the stator bore to add some damping. The current motor air-gap is 0.015". If I install a copper tube in the stator bore bonded to the stator and leave a 0.005" air-gap...

Hello, I am an artist working on weighted cloth in my practice since 2015. Each piece I make by hand and is extremely time consuming. I would love if someone would take a look at this and give me any thoughts you might have. I am working on a project that requires filling thin, fabric...

A friend is writing a story in which somebody steals a frozen, non-fertilised ovum from an egg bank, meaning to do something with it (not sure what). The thief then forgets about it and finds the tube containing the ovum in her pocket a few days later. She looks at it under a microscope. The...

I do not understand parts c and d. For part C I have no idea where to start. And for part d, I got 1/4λ = L (open-close tube fundamental harmonics) so λ = 4L. But the answer key says it is 1/2 L. Help!

While trying to dislodge some stubborn coffee debris in the holes of a wet espresso bottomless portafilter by blowing into it I discovered that it produced a tone at just over 3000Hz, with harmonics. I wondered, is there some way to use that to determine something about the hole size and...

I'm planning on making marquee poles out of aluminium tube. I did so last year and they worked well, but they flexed slightly under tension. To correct this flex, I want to use slightly different size of aluminum tube. I used 4" tube, with a ¼" wall, at a length of 30'. Will the tube be...

Hi everyone, I'm working on a first-year college assingment and need some help with it. I need to figure out how deep does a tube, initially filled with air, need to be submerged into water in order get fully filled, meaning in order for the air to be fully displaced by water. The tube is 1/2...

1. Problem Statement: The pressure in an gas tube of length L stretched along the x-axis is given by P(x, t) = Patm + P1(x, t) + P2(x, t) (1) where , P1(x, t) = 20 [P a] sin (−5.9 x − 1300 t ) P2(x, t) = 20 [P a] sin (5.9 x − 1300 t )One open end of the air tube is at x = 0m. By how much does...

my text box says that the pressure at point A is less than pressure at point B Are not they supposed to have same pressure as they are on the same horizontal plane ?

Why the height of liquid is not affected by the radius of U-Shaped tube . ..my textbook says this and it does make sense because if increase the radius of u shaped tube the height of liquid should decrease as the liquids take shape of their container. Edit : I could not make the title longer...

Homework Statement see pic uploadedHomework Equations Pascal principal p = ρgh The Attempt at a Solution Pressure at C and D is the same . Pressure at A and B is the same ? I believe it is

Hi! This is my first post on here. I need to purchase an air cylinder, most likely hydraulic. The cylinder will have a forming die attached on the end and will be used to crimp two small stainless steel tubes together. The crimp will occur at an offset of .004 inches from each end of the tubes...

Homework Statement [/B] Homework Equations ##P=\rho gh## The Attempt at a Solution So this is the first time I'm doing fluid mechanics, and I'm trying my best to understand it. This was the first question, and truth to be told, I'm not very confident. I know what gauge pressure is: the...

Hi there, i have been working with a problem the past few days and have a hard time with some of the assumptions being made. The problem involves a piston in a tube which is connected to a vessel filled with air. The air behaves as an ideal gas to which the product PV^ζ is a constant. The...

Hi. I've recently conducted a Franck-Hertz experiment with mercury. I was able to see bluish glowing regions just as here: However, theory predicts 254 nm, which is far below visible. Are there other energy levels at play here? Wouldn't that mess up the 4.9-V-spaces of the drops in the current...

Please help me with this problem I am facing, I am lacking notions of acoustics and I would be very grateful if someone could clarify them: A tube has a revolution symmetry arounf the ##x## axis and has a section dependent of the value of the abscissa (x), so the profile ##S(x)## is known. The...

Hello there, I'd like to model a simplified version of a "Magic Eye" tube (e.g. without the amplification triode, and for a start, 2 dimensions only), or the visible display behavior. What I'm talking about: https://en.wikipedia.org/wiki/Magic_eye_tube#Operation Here is a nicer depiction of...

https://www.circuit-diagram.org/editor/ Hi, I was wondering if this is a good voltage rectifier and regulator for a GM tube power supply? The AC supply is approximately 500V, and the strange component at the bottom is a voltage regulator tube. Seems to work OK but I don't have any test equipment...