Compression Definition and 607 Threads

Homework Statement How far will a piston fall down a vertical cylinder 100 feet in length? If the cylinder is 10" in diameter, the piston is 100lbs, the cylinder has a bottom and is capable of fluid isolation, filled with ambient air at 80 degrees F, at sea level, the cylinder has friction free...

How can I calculated the wood strain in compression to plot it with stress, if the data that I have is the length and several extension data. The extension data corresponds since the 0 load to the the failure. Thanks. Since the equation for Strain is: ΔLength/Initial Length In order to...

I have a quick question. Consider the process S2 to S1 in the figure below Since this represents wet (isentropic) compression, mathematically we have ΔS=0 (assuming adiabatic compression). But if we consider the process in a physical way, we are going from a region of less disorder...

Hi, I would like to calculate a bending energy of a circular rod. It should be elastic bending. The rod/circular column should be loaded with some point load force at it's top. Any amount could be used, for example F=1,10,100 kN... I know how to calculate a strain energy of a rod loaded...

Homework Statement A 6.0kg box moving at 3.0m/s on a horizontal, frictionless surface runs into a light spring of force constant 75 N/cm. Use the work-energy theorem to find the maximum compression in the spring. Homework Equations W = K[SIZE="1"]2 - K[SIZE="1"]1 W = (1/2)*m*v^2 -...

I am thinking about the adibatic compression when the gas gets back to Th from Tc... My question is how the p and V gets same as the initial pressure and temperature... Can you prove it?

Homework Statement F= -kx-bx^3 of the spring A pendulum bob of mass m is raised to a point h and released.After hitting the non-linear spring, calculate the compression distance of the spring as function of k , b , m , g , and h . Picture...

An algorithm for data compression? I am coming from a philosophy and science background and I'm particularly interested in finding out what a generalised data compression algorithm would look like. (By algorithm I mean something like a flowchart that would show how this process could be...

I was just curious if it would be possible to compress fine iron powder into a solid puck without applying any heat or binding chemicals, etc. I'm guessing it would take several tonnes of force? Particle size of powder: about 30 microns

The spring used has a spring constant of k= 35000 N/m. a) how much work must you do to compress this spring by 0.10 m from its relaxed condition. U=1/2*k*x^2 .5*35000*(0.1)^2=175 J (correct) b)how much work must you do to compress the spring an additional 0.10 m? I tried the same equation...

Hello everyone. New guy, first post. I typically frequent gasoline engine performance forums, but my inquisitive nature has led me beyond the scope of general knowledge available within that format. I appreciate any help in figuring out the following. Thank you in advance! If 100 cubic feet...

Homework Statement A mass m = 0.5 kg is dropped from a height of 1.5m above the end of an uncompressed vertical spring with k = 500 N/m. What is the maximum compression of the spring? Homework Equations f_sp = -kx W_sp = 1/2 kx^2 W_nc = ΔK + ΔU K = 1/2 mv^2 U = mgh W = Fdcos∅ p =...

Homework Statement A 200g cylinder of metallic copper is compressed isothermally and quasi-statically at 290K in a high-pressure cell. A) Find the change in internal energy of the copper when the pressure is increased from 0 to 12kbar. B) How much heat is exchanged with the surrounding fluid...

Are there any resources which use Matlab to image compress a colour image using SVD? I can only find information where I need to convert to gray scale first.

Are there any resources which use Matlab to image compress a colour image using SVD? I can only find information where I need to convert to gray scale first.

Homework Statement An ideal simple gas turbine has a compression ratio of 5. What is its Homework Equations c=r(γ-1/γ) η=1-(1/c) The Attempt at a Solution I'm stuck, I think I need to use the above equations and possibly more. I just don't know how to find a value for the ratio of...

∫Homework Statement Compress a body reversibly and isothermally from P1 to P2. How much heat goes in or out?Homework Equations Maxwells four relations, differential forms of the four thermodynamic potentials (Central, Enthalpy, Gibbs, Helmholtz) The Attempt at a Solution My problem is that...

Im not exactly sure how encryption works, but, I think, it basically just scrables the alphabet, if you will. So somthing like "dusk" would become "ftjo" if red withot the decryption key. (of course, it is more complicated and in binary, but still..) Right? So.. if so, and if encryption keyy...

Homework Statement If a pressure of gas is suddenly reduced and we let the gas to expand again until it reaches equilibrium. What is final volume, work done and heat in this process? and what would be change in internal energy? Again the pressure is suddenly increased back to initial...

Homework Statement An ideal diatomic gas, with rotation but no oscillation, undergoes an adiabatic compression. Its initial pressure and volume are 1.9 atm and 0.30 m3. It's final pressure is 2.9 atm. How much work is done by the gas? P0 = 1.9 atm = 1.93e5 Pa V0 = 0.30 m3 P = 2.9 atm =...

I was watching a video on YouTube called 'How Much Does A Shadow Weigh?' and towards the end, the following question was posed: Suppose you had a button that was one light year away from you and you built a rigid stick one light year long. If you pushed that stick, would the other end of the...

So, until now I know: (DV/DS)p=(DT/Dp)s=a*T/cp*(rho) (enthalpy) (Dp/DT)v=(DS/DV)t=-a/k (helmoltz) (DS/Dp)t=-(DV/DT)p=-Va (gibbs) a=expansion coefficient k=isothermal compression coefficent cp=heat capacity at constante pressure I want to deduce DT/DV at constant entropy=(DT/DV)s. BUT...

I am designing a simple truss structure... consider a member of a truss under a compression of xN. As x increases, the member will tend to want to buckle. eulers strut buckling formula states that the force a member buckles at is inversely proportional to the square of the length of the...

For convenience, let's assume the following process to be ideal. Process 1-2 Isenthalpic compression Process 2-3 Condensation Process 3-4 Throttling Process 4-1 Evaporation The refrigerant is dry-saturated at the end of compression. Here's what I don't understand: During process 2-3, if we...

Homework Statement I'm supposed to find the forces in each member and then determine whether they are in tension or compression. I got the magnitudes right but it seems my directions are wrong according to the book but I am confident that I did the question right. The diagram is part of a...

Homework Statement A 7.0kg box moving at 6.0m/s on a horizontal, frictionless surface runs into a light spring of force constant 50N/cm . What is the maximum compression of the spring? Homework Equations K=1/2mv^2 The Attempt at a Solution K=1/2(7.0)(6)^2 = 126N 126N/(50N/cm)...

Homework Statement A 10g marble is launched horizontally from a spring of K = 20 N/m. If the marble ended up with a launch speed of 40m/sec, how much (in cm) was the spring compressed by?Homework Equations F=kx E=\frac{1}{2}kx^2 The Attempt at a Solution To find how much the spring was...

hi, does anyone know how to find how much axial pre-compression is required so that buckling will occur after a temperature rise of 50 C°? I know the cross section of the pinned at each end copper strip (4mm x 8mm) length= 100mm E= 100 GN/m^2 Coefficient of thermal expansion is 18 x 10^-6

Hello there, Sorry, if there's a thread about this already. Let's say if i have Piston which is fully insulated because as mentioned, it is an adiabatic compression. The pressure will increase as the volume of decrease. But what really happened when the system is compressed over the...

Question I have, could a compressor that works by say a spring that gets pushed by a electric actuator into a compression chamber,, the actual power it takes to compress the spring only takes say 1 second, the spring then provides compressed air for let's say 5 seconds of powering let's say a...

Hey there, I am currently working on a project to compare the compression strength of chocolates with different inside filling (caramel, nuts, coconut). I came up with the hypothesis that chocolates filled with nuts would require the most force to break while chocolates with coconut the least...

My apologies, I don't own a scanner or else I would show the 200 variations of formulas I've played around (my work) with all day to get these answers. Question is this; A short compression member is fabricated from 2 steel pipes. the pipe on the top has a cross sectional area of 3.17 in sq...

Homework Statement A liquid is enclosed in a metal container that is provided with a piston of the same metal. The system is originally at a pressure of 1.00 atm (1.013*10^5 Pa) and at a temperature of 30.0 C. The piston is forced down until the pressure on the liquid is increased by 50.0 atm...

I have seen some builds of naturally aspirated engines, originally using around 10:1 CR, being built up to 13:1+ CR and then having 15psi of boost thrown at them from an aftermarket turbo kit. I can't comprehend how this is possible without the engine melting, what do you need to do to make a...

Spring Compression problem!- PLEASE SOMEONE HELP! PLEASE! DX<? Spring Compression problem! A 2.4kg block is dropped onto a free-standing spring with k=1100N/m from a height of 1.7m above the spring. What is the spring's maximum compression? Okay, so I drew a picture of the situation. Frame...

Homework Statement One mole of gas compressed to half of its original volume adiabatically, what is the work done? Homework Equations dE= dW + dQ (the d one the w and q should have the line though it) pV^ α= constant = k The Attempt at a Solution As it is adiabatic dQ = 0...

I'm having trouble understanding what happens to the internal energy of an ideal gas being compressed adiabatically. If DU = DQ + DW, then as we do work PdV compressing the gas, since in adiabatic processes DQ=0, W the change in internal energy is non-zero, so U must increase. But if...

Say I have a gas enclosed in a bottle with a weight on top exerting pressure P0. Let the gas pressure be P. If P0 is not equal to P the compression/expansion will be irreversible. If P0>P and the gas is being compressed: Work done on the gas is: -PdV Work done on surroundings by the gas...

When we are sitting in our cars, and the car begins accelerating we are "pushed back" due to acceleration. Or if you have a ball in an empty vehicle, when it starts accelerating, the ball will roll to the back of the car. I was wondering, is this also true in air? If there is an...

Hi, Does a compression spring’s pitch or rise angle have any relation with its spring constant k? I checked various sources and they differ on this. Some sites simply asks you to feed input into a simple formula: k=Gd4/3D3na in which k: spring constant G: material’s shear modulus d...

Imagine you are getting dressed in the morning and fastening a belt around your waste. You pull on the loose end of the belt, developing tension T throughout the length of the belt. Using this information, how can you determine the amount of compression the belt is applying to your waste? I...

Question: A block of mass m and speed v collides with a spring, compressing it a distance deltaX. What is the compression of the spring if the mass of the block is halved and its speed is doubled? I have no idea how to do this problem. If anyone can explain this to me it would be GREATLY...

How does the first law of thermodynamics apply to the Compression And expansion of a gas at constant temperature ? If the gas is at a constant temperature and is being compressed, then ΔQ = 0 ΔU = + W(on the system) = + Are those(^^) correct ? The equation being : ΔU = ΔQ +...

Homework Statement a fluid undergoes a reversible adiabatic compression from .5 MPa, .2 m3 to .05 m3 according to the law PV1.3 = constant. determine the change in enthalpy, internal energy and work transfer during the process. Homework Equations P1V11.3 = P2V21.3 dH = T dS + V dP dS = 0...

Hi again I try to solve this by my own with little help from the net, but still I'm not sure if it's the correct! Here is my work, and please someone tell me if I'm wrong, again. (x = 20,8 m ?) Thanks P.S. Here is the full problem http://i.minus.com/j8Fbhtd9CJtCQ.jpg

Homework Statement The figure(Figure 1) shows a thermodynamic process followed by 150 mg of helium. Determine the pressure (in atm) at points 1, 2, and 3. Determine the temperature (in °C) at points 1, 2, and 3. http://imgur.com/B7lwQ n=.0375 mol P1=3 atm P2=1 atm T1=971.85 k T2=971.85 k...

An object with mass m1=0.4kg moves at v0=10 m/s toward a second object with mass m2 = 0.8kg. Attached to the second object is a spring with spring constant k = 200N/m, and natural length L0 = 0.1m. As the objects collide the spring is initially compressed. After compressing a maximum amount the...

I'm just trying to figure out a theory. Forget what you know about a reciprocating piston engine, and just dream with me for a second. Say a piston could just turn around and come back down the cylinder at ANYTIME in the stroke, would the fuel always burn most efficiently? It's hard to...

Need help in determining the impact force strength of a door stop rubber. It is a urethane rubber formed in a triangular shape. I used a 50t press with a 2" round shaft to compress rubber product and it required 100 lbs of force to compress. I believe this worked out to 18.75 ft lbs to...

Hello, for some reason I can't seem to be able to find this. Suppose you have a elastic cylinder, a full cylindrical bar (not hollow), and you want to compress the two end faces (axial compression) together and find the stress in the axial direction...or strain. I can't seem to be able...