Compression Definition and 607 Threads

The title might be a bit confusing but I just want to know if you can recreate (partial) the system of refrigeration with hydraulic compression. So say, you have a container (cylindrical piston) filled with water, then you apply pressure. Will the water's temp increase? Then, will the...

Hy please help me .i am strugling to calculate the mechanical efficiency of a compressor as i am not given power output and power output

Homework Statement In a diesel engine air is adiabatically compressed to autoignition temperature (287oC) of diesel. Given C/nR=2.78 for air, and the room temperature is 27oC, what is the compression ratio where diesel vapor is added for ignition.Homework Equations PV=nRT PV=NkT C=(dU/dT) The...

Homework Statement An inclined plane of angle θ = 20.0° has a spring of force constant k = 460 N/m fastened securely at the bottom so that the spring is parallel to the surface as shown in the figure below. A block of mass m = 2.51 kg is placed on the plane at a distance d = 0.324 m from the...

Let's say I've got a helical compression spring of a known length and strength, and I want to know how much force it would take to twist the spring around the axis of its coils, effectively making the diameter of each coil smaller, so it acts a bit like a torsion spring. I know Hooke's law is...

I had an idea for a type of shoe similar yet different from air Nike, and I would appreciate some comments. A hind foot air chamber would be compressed upon a runners foot strike ( with a force up to three times body weight). The air would be pushed through a one way valve into a rigid mid...

Homework Statement A spring is compressed from both ends by 100 Newtons and the spring constant is given as 1000N/m. What is the net compression distance/displacement (x)? Homework Equations F=-k*change(x) The Attempt at a Solution Initially, I thought that the net displacement would...

I cannot seem to visualize how this compression and rarefaction occurs for example when I clap my hands, I know I move air molecules away from me, but it's so weird that such compression(high air pressure) and rarefaction(low air pressure) occurs. I also do not quite understand why this...

I would like some insight on a problem I have been working on. I have a seal container of air where the outside chamber has a slight temperature differential between top and bottom. I understand this causes a density variation in the air between the top and bottom of the chamber. Now I am...

To simplify this question, let's say the ocean is 3800 meters deep and 1 meter wide in either direction. Now let's add water equaling 1 cu meter on top. How much higher does the ocean get?

For whatever reason this equation is slipping by me, I don't want to use a calculator though because I am building a spreadsheet. Can someone please tell me the equation to calculate o-ring compression? Thanks

Hello, when gas compressed it get heated, proper reasons i don't know. If we consider first kinetic energy increases due to external work done but hows that happens? and if we consider heat is first, where from it came? my guess is that when molecules come closer in confined wall( due to...

How do I design a spring given only pressure and the the maximum length by which it can be compressed. I tried using the formula P=F/A but I don't have the force to be applied on that spring.

Hi,all. What changes the variations of compression rations in diesel and otto cycles which are always used in the engines. Are there any cycles used in automobile engines other than otto, diesel or seillinger?

I want to know how much energy REAL steam compressors consume in compressing steam @ 1 kg/sec from 2.56 kPa to 1 bar. Theoretically (with `100% efficiency) it's 141 kW for making 1 kg/sec steam flow assuming that the temperature doesn't decrease due to loss of heat as latent heat of...

Homework Statement (a) A block of mass m = 2.00 kg sits on a massless platform supported by a vertical spring with spring constant k = 55.0 N/m. How much is the spring compressed? (b) The block is now lifted off the platform and dropped from a height h = 1.5 m above the platform and...

Homework Statement https://scontent-a-sjc.xx.fbcdn.net/hphotos-frc3/t1.0-9/10294335_1407511836191702_8633020308624670643_n.jpg Homework Equations PE=.5kx^2 F=-kx The Attempt at a Solution I honestly just don't know how to approach a problem where you have to find both the...

I am designing a constant pitch, helical conical compression spring (round wire cross section) that will be compressed into a final desired shape. So my issue at hand is figuring out the pre-compressed geometry that will give me my desired final geometry once compressed. The compression will...

Here is my basic question: Lets say we have a massless charged shell with charge q and radius R. Is there some R where a black hole is formed? I haven't work this out with the EFE, but the calculations I've done are relativistic (GEM equations instead of EFE, for simplicity). I found that...

I've never done this before, and undertook it for the first time today, guided by books, google, and YouTube. My truck's a 4 cylinder. I did the first test after driving it for a while to warm it up. I got 150-150-146-140 psi for the four respective cylinders 1-2-3-4. The instruction I was...

I understand that the purpose of a damper system is to stop the spring from bouncing during rebound. But,technically speaking,I do not understand the matter of energy absorption in the damper during rebound. 1.The damper is absorbing energy during compression along the bump and dissipating...

A monatomic ideal gas that is initially at a pressure of 1.60×105Pa and with a volume of 8.50×10−2m3 is compressed adiabatically to a volume of 4.00×10−2m3 A) What is the final pressure? - 5.63E5 B) How much work is done by the gas during the compression? C) What is the ratio of the...

I have a question about a spring gun. Suppose the barrel of a spring gun is placed horizontally at the edge of a horizontal table. You put say a marble in the barrel and compress the spring x cm and after releasing the marble it travels a horizontal distance of y cm before hitting the floor (so...

Homework Statement Lets say I have a spring with a stiffness of k = 250 N/m originally unstretched. I then gently place a 5 kg block on top of the spring. How much does the spring compress? Homework Equations W = mg F = -ks mgΔh = 0.5k(Δh)2 The Attempt at a Solution Using...

Hello everyone, I know nothing about physics - i can barely spell the word. I am curious if anyone can explain to me what z-field compression is? I think its related to black holes? Much appreciated

Hi, I'm a bit confused. Say you're bending a cylindrical pipe (tube, hollow cylinder). So the neutral axis of the pipe will be in the middle of the pipe and all the material on the inside of the bend (to one side of the neutral axis) will be in compression, while all the material on the...

Hello all, I have to measure the compression strength of a porous ceramic body (d=L=10 mm) using advanced force gauge, mecmesin and don't have any experience with it. The simple procedure, which I followed, was to measure the force at which the sample started to break, divided by the cross...

Homework Statement Mass- 0.8 kg Initial Velocity- 3 m/s Spring constant- 500 N/m No friccion Final velocity- 0 Homework Equations What is the maximum compression of the spring? I don't know where or how to start! Please help.

Hello! I am wondering what supplies the energy necessary for the compression of a gas that is entrained in a flow of water. For example: 1. a water/air mix is traveling down a horizontal pipe with some speed v. The pipe enlargens and thus waterspeed falls and static pressure rises. The...

Homework Statement A 15.0kg stone slides down a snow-covered hill, leaving point A with a speed of 12.0m/s . There is no friction on the hill between points A and B, but there is friction on the level ground at the bottom of the hill, between B and the wall. After entering the rough...

Hello, I am currently designing a pressure vessel and am interested in compressing it with nitrogen up to approximately 10 MPa. How would I go about determining the associated temperature rise when this takes place? This will have implications on the strength of the metal used. Thank you...

Homework Statement A very simple question, but I can't figure it out. An ideal diatomic gas, with rotation but no oscillation, undergoes an adiabatic compression. Its initial pressure and volume are 1.20 atm and 0.200 m^3. Its final pressure is 3.60 atm. How much work is done by the gas...

When you have a perfect compressor the compression will follow an isentropic line and an h,log(p)-diragram (enthalpy,pressure diagram) but why? What is entropy exactly and what does it mean in such a system? In real life the compressors have an isentropic efficiency of maybe 0.8, which will...

Hello, this is my first post on this forum so nice to be here, and I'll be very appreciative of any responses. My background is in acoustics, and hence my question is relevant to vibration propagation. The terms 'compression' and 'longitudinal' are both frequently used to describe the same...

How can i compress methane without a risk of it exploding? I want to compress methane generated form biomass into a storage tank (a small propane tank) without flattening my workshop. Does anyone know a safe way to do this? Thank Sam

Hey guys If I have a cylinder of mass 5 kg and release it along the vertical axis onto a spring with stiffness coefficient (k = 1.8 kN), how would I need to set up the work/energy equation(s) to find the maximum compression and deflection of the spring. And what would the maximum velocity...

Homework Statement A 4.80kg cart has a spring with spring constant 3200N/m attached to its front, parallel to the ground. This cart rolls at 4.40m/s toward a stationary cart with mass 1.60kg . Homework Equations PEspiring = 1/2*kx^2 KE = 1/2*mv^2 The Attempt at a Solution I was...

Hello all, Its review time again for another Thermodynamics midterm. As such, I have a practice exam to try for optional extra review work. I've come across a problem that I'm somewhat stumped on. I've tried the problem, but I feel as though I've made too many assumptions in trying to solve...

Hi all, basically we're building a model bridge (30 grams) for a mechanical engineering project out of balsa wood and kevlar (for the strings). I've attatched a pdf file of the bridge design, although it doesn't show the strings. We are wanting to do some basic load compression calculations...

Hi all, Hope you can help I am trying to figure out the temperature rise in a liquid subject to high pressures (7000bar in this case) Is the below adiabatic gas equation still suitable? or is there another way of working this out for liquids? T2 = T1(v1/v2)^y-1 P2 = P1(v1/v2)^y Were y =...

Homework Statement A 165g plastic block is set up against a spring. The block rests on a smooth (I'm assuming this implies that there is no friction involved) horizontal surface. The block is pushed into the spring, compressing it a distance of 15.0 cm and released. The spring constant is k=...

This is more a thought experiment that I'm not completely sure I'm getting correctly... So here we go: Imagine we have a tank that we are filling up with a substance in gaseous form. Imagine also that we have a good pump that will allow us to fill this tank with this gas up to very high...

Hello all, Would appreciate some guidance here. I have an air compressor compressing ambient air to 3000 psi into a 425cu-in tank. I have the volumetric flow rate at the exit. If I was looking for relative humidity, dew point, and moisture content/accumulation at the exit, how would I go...

Homework Statement An ideal gas, Cp = (5/2)R, Cv = (3/2)R, is changed from P1 = 1 Bar and V1t = 12m^3 and V2t = 1m^3 by the following mechanically reversible processes: a) Isothermal compression b) Adiabatic compression followed by cooling at constant temperature c) Adiabatic compression...

Excuse the language. English is not my first language and in physics terms I might be lacking. I was just brainstorming. Is there a fuel that could be used with efficiancy in a compression free engine?

A child slides a block of mass 2 kg along a slick kitchen floor. If the initial speed is 4m/s and the block hits a spring with spring constant 6 N/m, what is the maximum compression of the spring? What is the result if the block slides across 2m of a rough floor that ha μk = 0.2? (second...

Block 1 has a mass of 2kg and is moving to the right on a frictionless surface at 10m/s. Block 2 is ahead of Block 1, has a mass of 5 kg, and is moving to the right at 3m/s. Block 2 also has a spring attached to its left end, which has a spring constant of 1120 N/m. When the blocks collide...

The problem is the following, i have a rectangle as a cross section of steel, which is bended and compressed.. i want to use the equilibrium equations to make sure its static, but since the compressive force and the traction force aren't equal, the equilibrium equations make no sense here's a...

Hello, I have found several references (I can send you the links if you want) that point to the fact that the enthalpy under uniaxial compression along z of a solid is simply given by: H=U+PzV This appears to make sense as during uniaxial compression the Pz pressure component is the...

Homework Statement Consider a pump that is required to compress air in a factory. The cylinder in the pump has an inner diameter of 2.00 cm and length 60.0 cm. Air is drawn into the pump at atmospheric pressure and 18°C and the pump adiabatically compresses the air to a pressure of 17...