Compressed Definition and 309 Threads

compressed gas...and heat transfer... If you were to take a cylinder of air, at room temp, and let's say it is 100ml in volume. If you were to take this cylinder of air, compress its volume to half its size, how much heat would that create (btu's) and if the heat were to dissipate, would the...

Is it possible to get frostbite from compressed air? How does this happen?

Homework Statement An egg is dropped from a third-floor win- dow and lands on a foam-rubber pad without breaking. The acceleration of gravity is 9.81 m/s2 . If a 56.3 g egg falls 11.9 m from rest and the 7.29 cm thick foam pad stops it in 6.32 ms, by how much is the pad compressed...

I would like the formula that describes the reduction in pressure that results when a constant flow (cfm) of compressed air travels from a 3" diameter pipe through a bell reducer that provides a smooth transition to a 1.5" diameter pipe. Also, in the same piping configuration as described...

A block of mass m = 1.9 kg is dropped from height h = 77 cm onto a spring of spring constant k = 1510 N/m (Fig. 8-38). Find the maximum distance the spring is compressed. My attempt: mgh = 1/2kx^2 (1.9)(9.8)(.77) = (.5)(1510)x^2 x = 0.138m But it's not the correct answer. What am I...

[b]1. When seven people whose average mass is 83 kg sit down in a car they find that the car drops down 0.87cm lower on its springs. Then they get out of the car and bounce it up and down. The acceleration of gravity os 9.8m/s^2. What is the frequency of the car's vibration if its mass (empty)...

Homework Statement I need to find the maximum distance a rocket (which is actually a bottle filled with compressed air to 654kPa) can travel when the exhuast nozzle is 22cm (and can be changed to any smaller size if needed). Neglect air resistance. The bottles original mass is 50g...

Homework Statement A gas is compressed, allowed to expand linearly, and then cooled at constant volume as shown in the P-V graph. How much work is done by the gas in this cycle? in the graph: compression is a straight line at P(atm)=3 that goes from V(liters)=1 to V=5; cooling occurs at...

Homework Statement A 1864 g mass is on a horizontal surface with mk = 0.380, and is in contact with a massless spring with a force constant of 631 N/m which is compressed. When the spring is released, it does 3.15 J of work on the mass while returning to its equilibrium position. Calculate the...

Homework Statement An ingenious bricklayer builds a device for shooting bricks up to the top of the wall where he is working. He places a brick on a verticle compressed spring with force constant k=350N/m and negligible mass. When the spring is released, the brick is propelled upward. If...

This is more like personal homework and I have searched everywhere to find the answer to this with no luck. I was watching mythbusters re-runs the other night and the hurricane episode was on. They were trying to prove that straw could go through a tree in hurricane force winds. What...

Hi All I'm trying to work out a method to determine the efficiency of a compressed air motor. Obviously I can measure the input pressure and flow rate of the compressed air, and I can measure the output power of the motor with a dynomometer. What I want to know is how much energy is...

Hi, Question: Is the Lifting Power of Air in Water solely based on its Volume or does the pressure of the Air factor in? As an example, in Salt water if you have a Bell with 2 Cubic ft of Air in it, at the Oceans Surface it can lift 128 Lbs, because air can lift the amount of Water it...

Internal combustion engines, Ram Jet, Turban engines etc. require that the air fuel mix be compressed. Is the compression of the air fuel mixture required to give a higher or more efficient energy output? Otherwise if the air fuel mix were at a static or ambient pressure vs. compressed would the...

Homework Statement A block of mass 2.0kg is dropped from height h=70cm onto a spring of spring constant k=1960 N/m. Find the maximum distance the spring is compressed. Homework Equations KE initial + PE initial = KE final + PE final KE = 1/2(mass)(velocity)^2 PE = mgh or, when dealing...

Hi, I am trying to figure out how much energy is stored in compressed air. I have figured out that a device I am looking at compresses about 174 cubic feet per minute into 35 cubic feet and that the temperature would rise from 70 F to 550 F. I now want to know how much energy, in the form...

Hi. What happends when i put fire to wood that I have in a chamber with a pressure of about 15 kg/cm2 = 14.710 Bar = 213,3 Psi. Will it burn as usuall or much faster? Will I get a very high pressure? How High pressure can I get? Magi

Hello, is it possible to figure out how much force in Newtons is created when a compressed gas expands?

How can I figure the pressure in a 80 cubic inch tank at 0 psi being refilled with a 8000 cubic inch tank with a pressure of 3600 psi?

Homework Statement A block of mass 13.0 kg slides from rest down a frictionless 35.0° incline and is stopped by a strong spring with k = 2.60 x 10^4 N/m. The block slides 3.00 m from the point of release to the point where it comes to rest against the spring. When the block comes to rest, how...

Homework Statement Two blocks, A and B, are connected by a compressed string. The mass of bock A is twice that of block B. Immediately after release, compare the net force on block A to the net force on block B. The table is frictionless and the mass of the spring is zero. 1)There is no...

Two blocks with masses m1 = 1.2 kg and m2 = 3.5 kg are at rest on a frictionless surface with a compressed spring between them. The spring is initially compressed by 65.0 cm and has negligible mass. When both blocks are released simultaneously and the spring has dropped to the surface, m1 is...

Hello, This is not a homework problem, but an engineering office problem. I’m looking to replace a steel compression spring with a gas cylinder. The spring is presently designed to absorb a known amount of kinetic energy which it ideally converts to potential energy (neglecting friction...

Guys , Pl. help me out with this one. I got a vessel of vol. V and its filled with air to a pressure P. I want to know the energy contained in the compressed gas. The gas is going to be suddenly discharged via an orifice and I want to know how much work it can do. I had imagined that the...

HI, If you compressed 300 litres (about 12 moles) into a 3 litre cylinder which was already at 3,000 degrees C. Would the air reach this temperature in an instant? Im trying to get my head around this stuff about heat capacities and amounts of energy needed to heat materials. Please...

I don't know what to research or where to start but I would like to know much energy a compressed gas a requires to turn back into a gas if it is a liquid. Is there a term I should research and a formula like with specific heat? The problem I am trying to solve is how much heat does X...

The compressed air car is a much desired development in the search for an alternative cleaner, non-polluting form of motivating power that can be used in transportation. For the past 150 years the IC Piston engine, working on the Otto cycle and first invented in 1866 by Nicholaus Otto, has been...

hey guys can any1 tell me wats the concept behind cars using compreesed air as fuel...

Hi, I'm currently designing a model torpedo and plan to use compressed air for it's propulsion and am working out if it's feasible. At the moment I'm trying to calculate how long it takes for X volume of compressed air at Y pressure to leave (IE return to atmospheric pressure) through a...

Hi all Looking for simple formulas to describe maximum acceleration of steel tubes when tubes are compressed and suddenly released when submerged in water (dont know if the water does anything else than supply buoyancy). Please, also feel free to comment freely on the topic and formulas...

If I have a tank of compressed air with 5% CO2 and 95% air, and I know the flow rate coming out of the tank is 0.01 LPM, how do I determine the number of [moles/L] of CO2 coming out of the tank?

A tank of compressed air of volume 1.0 m^3 is pressurized to 50 atm at T = 273 K. A valve is opened and air is released until the pressure in the tank is 17 atm. How many air molecules were released? I tried this problem using PV = NkT and PV = nRT. I realize the difference in these...

Homework Statement A 60kg person is at rest with a vertical distance 1 m above the groud, compressed against the a spring. The spring is compressed a distance of .2m from its equilibrium position, with a spring constant of 1000 N/m. The person lands into a springy trampoline with a spring...

A 2 kilogram block is dropped from a height of .45 meter above an uncompressed spring. The spring has an elastic constant of 200 Newtons per meter and negligible mass. The block strikes the end of the spring and sticks to it. A) Determine the distance that the spring is compressed B)...

Just thinking here. What would happen if you had two pieces of something that connect perfectly and form a chamber of air inside. Then you took all the air out to make a perfect vacuum. Now if you were to pull the sides would it break apart. I don't understand how there would be a perfect...

The force required to compress an imperfect horizontal spring an amount x is given by F = 150x + 12x3, where x is in meters and F in Newtons. If the spring is compressed 2.0m, what speed will it give to a 3.0 kg ball held against it and then released? I know how to integrate F(x) to get the...

Hello! My process looks like this: i've oil container with constant vacuum of 3-10 mbar for removing oil aerosols from container.that vacuum is produced by ejector(vacuum pump) down the line in which goes air at 6 bar.oil aerosols then together with air goes to atmosphere. what I'm trying to...

Hello, I am interested in finding out the electric power output from a compressed air system. i see that there is a formula for calc. it with the amount of compressed air required to generate about 1 W with a pressure of 1 bar is given by Compressed air(cu.mm/s) = (1000 N-mm/s) / (0.1...

A glider of mass 0.13 kg moves on a horizontal frictionless air track. It is permanently attached to one end of a massless horiztonal spring, which has a force constant of 9.1 N/m for both extension and compression. The other end of the spring is fixed. The glider is moved to compress the spring...

This is a question which I am sure i already know the answer to. Its purpose is simpley to clear up a dispute between my self and someone i know. In a canister where gas is compressed into a state of liquid. Is the liquid suspended toword the top side of the can held up by some non-liquid...

I couldn't really simulate this in my brain, What will happen when atoms are compressed up to an infinite level ( extreamly great presure ) Will the atoms split up? if so what will the product be?

"A block of mass m1 = 2.4 kg slides along a frictionless table with a speed of 10 m/s. Directly in front of it, and moving in the same direction, is a block of mass m2 = 4.6 kg moving at 2.8 m/s. A massless spring with spring constant k = 1160 N/m is attached to the near side of m2, as shown in...

I will make a crude visualization of this system: |-------------O--------------| <-----a------><------a------> Identical springs: k1=k2=k Natural Length: l > a The problem is to prove that the system is unstable. Obviously, a slight movement directed off the horizontal axis will cause the...

A compressed spring that obeys Hooke's law has a potential energy of 18 J . If the spring constant of the spring is 400 N/m, find the distance by which the sping is compressed. Please correct me if I am wrong, I'm not sure how find the distace. My work: k 400 N/m x=18J = 400 N/m/18...

a compressed spring is completely dissolved in acid what will happen to the elastic potential energy of the spring? With reasons. I think that the E.P.E will have an effect on the heat released but I still don't have backup. I am still not so advanced.

I was wondering something. I have this can of compressed air and when its upright and used, it fires out a bunch of air. If i turn it onto its side where the nozzle points up however, half the time the air is actually visible! (or too cold?). What is causing this? It also does it when you turn...

hey, i was wondering if anyone could help with this question. it seems simple but i can't find a formula for it. 2.5 mol of perfect gas at 220 K and 200 kPa is compressed reversibly and adiabatically until the temperature reaches 255 K. Given that its molar constant-volume heat capacity, CV,m...

if a vertical spring is being compressed down, is the Elastic potential energy the only energy? Ee = .5kx^2 is gravity included in that? or does it not play a role? and how could I tell how far an object would fly up in the air once the spring is released? thanks

Helium gas is compressed form 1 atm and 25 degree C to a pressure of 10atm adiabatically. the lowest temp. of helium after compression is i don't know how to start if anyone can give me hint to start the problem it would be a great things thank you waiting for your answer i got the...

I was trying to work on this for a little but couldn't figure it out. A. A spring with a spring constant k=30 N/m is compressed and latched at 0.10 m. How much elastic potential energy is stored in the spring? ? 0.15 J B. An object with a mass of 5.0 kg is placed next to the...