Compression Definition and 607 Threads

Homework Statement A spring is compressed by 0.100m from its equilibrium position, and two blocks of masses 3kg and 5kg are resting motionless on each side on a frictionless surface. The spring has a force constant of 20 N/m, and a rope holds the block in position against the compressed...

in most mammals, the spine is usually horizontal in monkeys swinging from branch to branch, the spine has evolved to operate vertically under tension in humans (and other animals that walk on two legs), the spine is in compression when vertical did humans evolve from swinging monkeys...

Hi PF! I'm modeling a system using EES in which compression of water occurs from approximately 2 bar to 200 bar. During the compression, the temperature rises from 300K to 305K. There's no heat transfer and the pump works as an ideal machine. I remember my thermo professor saying that...

1. Homework Statement Two equal masses of an ideal gas initially at the same temperature and pressure are compressed to half of their initial volumes, one of them isothermally, and the other while thermally isolated from its surroundings. Which one of the following is the same for both...

Homework Statement The Femur bone in the human leg has a minimum effective cross section of about 3.0 cm2 How much compressible force can it withstand before breaking Homework Equations Compressive Strength (bone)(N/m2) = 170 x 106 P = F/A The Attempt at a Solution Not sure what a...

[SIZE="5"]A 500 kg car uses 10 kg aluminum alloy tire ring, what is the compression stress on one of the wheel rings if the contact area is 0.10 m^2 with the tire so the model answer is stress = F\A 127.5\0.1 = 12,750 Pa where did we get the force from ? 127.5 ?

Homework Statement A 5.0kg mass is hanging from a spring scale and is slowly lowered onto a vertical spring. The scale reads in Newtons. a) what does the scale read when the mass is not in contact with the spring? b)the scale reads 20N when the lower spring is compressed by 2.0cm. show...

Homework Statement is the hooke's constant same for compression as well as extension of all the materials and springs? Homework Equations Force = hooke's constant * extension [ to a limit] The Attempt at a Solution

Hello, I am working on a project for my physics class and I'm not sure how to proceed. I decided to do mine on the physics of a punch, and I have a few ideas of how I can collect data, but I'm not sure if I'm looking at it the right way. I was going to make a soft clay block and find it's...

1 mole of an ideal gas is compressed isothermally from 1 to 10 bar at 298 K. Calculate the total entropy change associated with this process if it is carried out 1) Reversibly 2) Irreversibly S (system) =nRln(vf/vi) for an isothermal process. I think I am getting a bit...

1. A streaming Netflix movie is usually 720 by 480 pixels. The color for each pixel takes 3 bytes to encode, and a feature film shows 24 frames (individual still images) per second. a.) How many kilobytes are needed to encode one frame, without compression? b.) How many GB are there in a...

Dear forum, I need some guidence on how to solve shear stress on a pin and the hole compression due to force load on the pin. I haven't provided number as I can work those out later, but simply I am asking for a step by step! [PLAIN]http://img835.imageshack.us/img835/8623/problemsb.jpg

Let's say the is a piece of wood with a few legs supporting it. There is a weight on it that weighs 500 lbs on the wood with rollers under it so it can move. Next to that is a clamp, let's say weighing 50 lbs, clamped onto the wood that is exerting the same amount of pressure onto the wood as...

I'm curious about how mass and compression differ in how they exert pressure. For example: You have a piece of wood. On the woods sits a 100lb weight. Somewhere else on the wood is a bolt going through it with a nut on the other side. This bolt and nut is tightened so that it exerts 100lbs of...

Homework Statement A horizontal uncompressed spring of constant k= 3 N/m and negligible mass lies on a frictionless floor. The right end of the spring rests against a vertical wall. A block of mass m=0.180 kg with initial velocity v0= 1.0 m/s is incident to the spring from the left. The spring...

It is repeatedly mentioned that "compressing hydrogen carries a significant risk of explosion"?. But why does compression of hydrogen carry explosion risk? Is it true for all gases?

Homework Statement A game uses a spring launcher to shoot a puck with mass of 0.5kg along a frictionless track as shown in the diagram. The spring has a k value of 600 N/m. By how much does the spring need to be compressed to launch the puck and have it go around the inside of the loop...

Homework Statement A 500g block is dropped from a height of 60cm above the top of a vertical spring whose force constant k = 120 N/m. Find the max. compression of the spring.Homework Equations Fsp = -kxThe Attempt at a Solution m = 500, height above horizontal = 60cm, k = 120 N/m I know the...

Spring compression -- Conservation of Energy Homework Statement So far I'm only working on part A. I didn't know whether to create separate posts for each part I had trouble with or just put the whole thing in one post. Homework Equations KE = 1/2mv^2 PE = mgh Uelas = 1/2kx^2The Attempt at a...

Homework Statement An 840kg roller-coaster car is launched from a giant spring of constant k=31kN/m into a frictionless loop-the-loop track of radius 6.2m. What is the minimum amount that the spring must be compressed if the car is to stay on the track? Homework Equations Wspring=0.5kx^2...

I am working on a swinging component. The component can swing with a varying amount of forces, which I need to control. I can not use an extension spring, because the widely varying amounts of force. I am hopeful that I will be able to use a pair of compression springs, yet I would need them to...

Hey guys, Got a quick question here; A simply supported beam of square cross-section is under compression. Which is the preferred direction for buckling? Why? Does your answer change if the beam is clamped at both ends?

Hi, Im working on a model where I need to look into the rate of heat transfer from a gas that's being compressed by a "liquid piston" of water. So basically a closed container containing a fixed amount of air n of volume V, is filled with water from the bottom until the volume of the air...

Homework Statement The potential energy stored in the compressed spring of a dart gun, with a spring constant of 62.50 N/m, is 0.540 J. Find by how much is the spring is compressed. Homework Equations I know that F=-k*change in x and also spring= 1/2kx^2 The Attempt at a Solution...

Homework Statement A 5 kg block is placed near the top of a frictionless ramp, which makes an angle of 30o degrees to the horizontal. A distance d = 1.3 m away from the block is an unstretched spring with k = 3000 N/m. The block slides down the ramp and compresses the spring. Find the maximum...

Homework Statement A 500 g block is released from rest and slides down a frictionless track that begins 2.00 m above the horizontal. At the bottom of the track, where the surface is horizontal, the block strikes and sticks to a light spring with a spring stiffness constant 20.0 N/m. Find the...

I have discovered something weird that I want someone to explain to me. The program in question is winRAR, haven't tested others. Here's the thing. That program at its best is able to compress random data(a piece of some transcendental number) to exactly 84 percent. However should you choose...

Two people leave from parallel points in space and head to other parallel points the same distance apart. Person 1 travels through empty space outside any gravitational influence, and it takes him 1 day to reach his destination. Person 2 comes close to a black hole on the way. It takes him 10...

I know the cut off ratio is of the specific volumes, but is that it? And what exactly do they tell you

I have air figured out, but what about in a fluid? Say an injector that goes from 0psi to 4000psi. How would I calculate that? Also, when the fuel shoots out of the injector, does the instant expansion cause it to cool back down to the temp it was at 0psi?

A 1 kg puck slides at 20m/s along ice, then hits and compresses a spring with a constant of 35N/M. When it first hits the spring, the puck experiences a frictional force of 4.0 N opposing its motion. What is the maximum compression of the spring? Homework EquationsKE=1/2mv^2 The...

Homework Statement A toy car with a mass of m=.079 kg crashes into a spring with constant k=69 N/m. If the car was going v=1.10 m/s, then how far will the spring compress? Homework Equations I think you could use the equation for Elastic Potential Energy but I'm not sure what to do with...

If i were to attach 2 helical springs (of same uncompressed length but different Spring constants) to metal plates on both ends and then apply a compressive stress on one of the plates, will both the springs compress the same? even though they hold a different tendency for compression...

Homework Statement A sample of 8.02*10^-1 moles of nitrogen gas (\gamma=1.4) occupies a volume of 2*10^-2m^3 at pressure 1*10^5pa and temperature 300K. The gas is adiabatically compressed to half its original volume. What is the change in entropy of the gas? Homework Equations...

Homework Statement Homework Equations The Attempt at a Solution Here is the work that I've done. This is an even problem in my book so the answer is not given. The professor did gave the answer to this problem as .33m. The most recent answer I got is .4m which means block b...

a monatomic ideal gas initially at 17°C is suddenly compressed to one-tenth its original volume. What is the tmeperature after copression? make the same calculations for a diatomic gas.

I read on Wikipedia that x-rays are sometimes used to compress nuclear fuel to initiate fusion reactions. This is probably a stupid question, but how can electromagnetic radiation compress matter?

Hi. I was wondering if anyone had ever done a relationship analysis of compression ratio in relationship to efficiency. I have heard that higher compression ratio can often relate to efficiency, but I was hoping to find some kind of graph correlation on it, however I haven't been able to find...

A 1.2 kilogram block is dropped from 0.48m above a spring in equilibrium. The force constant for the spring is 124 N/m. Calculate the maximum compression in the spring. m = 1.2 kg h = 0.48 + x k = 124 N/m x = ? Ep = mgh Ep = (1.2)(9.8)(0.48 + x) Ep = 11.76(0.48 + x) Ep = 5.6448...

Homework Statement Sketch the element for the stress state indicated and then draw Mohr's circle. Given: Uniaxial compression, i.e. \sigma_{x} = -p MPa The attempt at a solution Below I have the sketch and a partially complete Mohr's circle...

Hi everybody!:smile: I have a question about intercooling process in compressors Regarding ,for example, a mutli-stage compressor with 3 intercoolers,I'm a little bit confused about finding the intermediate pressures of each intercooler that minimize specific work.I'm able to find the...

How high a density would need to be generated to initiate nuclear fusion for a d-d reaction to occur? I know as we compress, temperature increases, but for a moment consider we can't heat the atoms, we can only compress them. What kind of density would would need to be reached? (Or is it...

Homework Statement A 0.75-kg object rests on a horizontal frictionless surface. It is in a position such that it is compressing a spring with a spring constant of 50 N/m. If the object is released, the object leaves the spring at a speed of 2.30 m/s. How far was the spring compressed...

Homework Statement A 11kg box slides 4.0m down the frictionless ramp which has an incline of 30o to the horizontal, then collides with a spring whose spring constant is 190 N/m. a.What is the maximum compression of the spring? b.At what compression of the spring does the box have its...

urgent help needed: compression testing hi guys, I have some homework problems about compression testing, please kindly help me out, I need to complete them by tomorrow but I have struggled for days... 1. what are the possible fixtures for compression testing? --- contrast them with those...

Homework Statement A 506 g block is released from rest at height h0 above a vertical spring with spring constant k = 500 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 18.4 cm. How much work is done (a) by the block on the spring and...

Suppose I have two masses with mass M each connected together by a spring with spring constant k like this: http://img827.imageshack.us/img827/4896/springs1.png Then I apply a force of F at both ends: http://img833.imageshack.us/img833/2562/spring2.png Then using Hooke's law F=kx, the...

Homework Statement A 0.40kg object connected to a light spring with a force constant of 19.6N/m oscillates on a frictionless horizontal surface. If the spring is compressed 4.0 cm and released from rest, determine (a) the maximum speed of the object. Homework Equations F = -kx The...

I'd just like to check my answer, it seems too big Homework Statement Air initially at 20◦C is compressed by a factor of 15. What is the final temperature assuming that the compression is adiabatic and \gamma ≈ 1.4 the value of \gamma for air in the relevant range of temperatures? By what...

Hello, I have a quick question regarding what goes on in air compressors. When air is compressed, I understand that we're doing a couple of things: 1. Squeezing a mass rate of air from one pressure to another - which takes work 2. Imparting heat to the gas stream - again part of doing...