Compression Definition and 607 Threads

A 0.50 kg block is pushed against a 400 N/m spring, compressing it 22 cm. When the block is released, it moves along a frictionless horizontal surface and then up an incline (which has friction). The angle of the incline is 37 degrees and the coefficient of kinetic friction is 0.25. Use the...

Homework Statement Please check the enclosed figure. Find the force of compression in the wire loop. Magnetic field B is directed into the page and current i is flowing anti-clockwise. The radius of the wire loop is 'a'. Homework Equations \vec{F}=i\vec{l}\times\vec{B} The...

i have calculated the coefficient of performance COP for both COP ideal and COP from p-h diagram. But the COP ideal i get is lower than the COP i calculated from p-h diagram. is it possible? please help :)

Homework Statement Hi Guys, I am trying to solve a classic problem involves conservation energy, spring, compression, I got my attempt and answer and I think my step was correct but the answer is different with the solution, can anyone please have look for me, any suggestions will be really...

I am asked to rate a series of elastic collisions in order greatest time of max compression to least time of max compression for several vehicles with varying masses and velocities, which strike a spring with a spring constant k. I can determine the Momentum of each case, as I am given...

Homework Statement A 11 kg box slides 4.0 m down the frictionless ramp shown in the figure , then collides with a spring whose spring constant is 190 N/m. The angle of the ramp is 30°. What is the maximum compression of the spring? Homework Equations Ei=mgh Ef=1/2kx^2 The Attempt...

Homework Statement A model diesel C.I engine has a volumetric compression ratio of 18:1 and a cut*off ratio of 1.5:1? The engine has a volumetric compression ratio of 18:1 and a cut*off ratio of 1.5:1. If p1 = 1 bar and T1 = 27°C, determine the pressure and temperature at each point in the...

Time Compression - the opposite of Time Dilation. Similar to Lorentz Length Expansion

Homework Statement This is one of the questions in my materials engineering assignment. 1. Thermal shock is the focus of this problem. Note that the resistance to thermal shock of a material, “R”, is defined here as the temperature change required causing fracture: (σc*λ*(1-v))/(α*E) Where...

Homework Statement A 1.18 kg block slides across a horizontal surface directly toward a massless spring with spring constant 5,803 N/m. The surface is frictionless except for a rough patch of length 0.42 m that has coefficient of kinetic friction 0.367. The initial velocity of the block is...

Time Compression and Length Expansion are the opposite effects of Time Dilation and Length Contraction. According to Lorentz, observation of time in another inertial reference frame is [SIZE="5"]ALWAYS dilated. But I read on some other forum that due to "Complex Lorentz Transformations"...

Hello. I need help with some thermo basics. I can't understand the concept of constant volume compression/expansion. Please help me understand how it occurs. Also, I am not clear on how pressure is an intensive property. To my understanding it IS a quantity dependent on system size (eg...

Homework Statement A cylinder is filled with .1 moles of an ideal gas at STP, and a piston of mass 1.4Kg seals the gas in the cylinder with a frictionless seal, as shown in the figure below. The trapped column of gas has an initial height 2.4. The piston and cylinder are surrounded by air...

Consider a heat pump works on the vapor-compression refrigeration cycle with 0.2 kg/s of refrigerant-134a as the working fluid. The cycle is used to maintain a house at 26oC while absorbing heat from the outdoors at 3oC. R-134a enters the compressor at 200 kPa as a saturated vapor and leaves at...

Hey guys, I know this is a simple question but I'm not really sure how to do it. Let's say we have a beam supported by two pins at both extremes. There is a central load on the beam, so it will deflect in the direction of the load. But we also have an axial force compressing the beam. My...

Dear physics forum, I am doing an experiment on the vibrational behavior of beams and a question has come up that I can't answer. How does compression affect wave speed? Brief overview of the experiment: studying the change in vibrational behavior of a beam that is gradually tapered...

When there is a change in the volume of a gas either compression or expansion and if it is carried out in multi step or single step stages is the work W_{a\rightarrow{b}} = W_{a\rightarrow{c}} + W_{c\rightarrow{b}}

I'm currently learning about different types of compressional work. The book I'm using covers mostly just isothermal and adiabatic processes, which make sense. Isothermal being so slow that everything equilibriates while adiabatic is so fast that heat cannot escape. However, the book briefly...

Assuming idealized springs under Hooke's Law: A spring 1m in length, mounted on the ground, compresses 10cm under its own weight. Next to it is a spring identical in material, construction, etc., but 2m long with twice the mass. If I understand correctly, doubled weight alone would...

Homework Statement Forum! I'm struggling on this one D: any help would be greatly appreciated! An elastic head-on collision, a 0.60kg cart moving 5.0m/s [W] collides with a 0.8-kg cart moving 2.0 m/s[E] The collision is cushioned by a spring (k=1200N/m) **Find the maximum compression...

Find the force of tension in the chain. Determine the force of compression in the support bar. Be sure to include a free body diagram as part of your solution. Now the only information given is a mass=20.4 kg and the angle 22 degrees. If anyone could help me with this question, it would...

Find the force of tension in the chain. Determine the force of compression in the support bar. Be sure to include a free body diagram as part of your solution. Now the only information given is a mass=20.4 kg and the angle 22 degrees. If anyone could help me with this question, it would...

Homework Statement http://img29.imageshack.us/img29/4386/prob1p.jpg The Attempt at a Solution To answer the first question as to why the air needs to be refrigerated, I think it's because refrigerating the gas cause it to do work, so its enthalpy will decrease resulting in a decrease in...

Homework Statement We have an ideal gas of N particles with mass m and temperature T and volume V. a) Calculate \langle E_{kin} \rangle We now reversibly compress the gas from volume V to V/2. During this compression heat Q is added, work W is done on the gas and the energy of the gas...

Homework Statement A 740g quantity of an ideal gas undergoes a reversible isothermal compression at a temperature of 330 K. The compression reduces the volume of the gas from 0.40 m3 initially, to 0.32 m3 finally. The entropy change of the gas is equal to: A) -43 J/K B) -150 J/K...

I have a system that looks like this: The top part is a piston, whereas the bottom is a displacer. I have looked at the Isothermal case for this system in a separate thread (https://www.physicsforums.com/showthread.php?t=553165) But in short, the result was that the pressure of the system...

Homework Statement Hello. I have some troubles with a truss problem. In fact i believe i have correctly identified the direction of the forces involved in the rods, but i cannot identify which rod is in compression or which is in tension. Are there any tips/rules to identify only with a force...

Homework Statement Homework Equations Work done by an ideal gas, isothermal process: W=n*R*T*ln(V_f / V_i) Work, constant-pressure process: W=p*(V_f - V_i) The Attempt at a Solution I first tried plugging n=1, R=8.31, T=273.15, V_f=17.5 L, V_i=24 L into the first equation and it...

Homework Statement A 4.63-kg ball of clay is thrown downward from a height of 2.69 m with a speed of 5.01 m/s onto a spring with k = 1610 N/m. The clay compresses the spring a certain maximum amount before momentarily stopping. b) Find the total work done on the clay during the spring's...

I really need help on this question, I've tried asking several people but I still don't quite get it. The formula for the work done on compressing/expanding an ideal gas is \int-pdV. Now first of all - p denotes the internal pressure of the gas right? If so, good so far. Let us now assume...

Have already received excellent help in understanding this but might need a bit more. Suppose we have a gas inside a cylinder with a piston in it. Now my teacher said that to compress the gas quasistatically we would need to press in the piston with a speed, that is slow compared to the speed...

hi in school we talked about a process called "isochoric compression". i do not really know what they mean by that, since the word" isochoric" refers to a process that has always constant volume, whereas "compression" makes me think of a change in volume. is there anybody who can explain this...

Homework Statement A 1 kg cart is at the top of a frictionless ramp as shown. It rolls down and makes an elastic collision with a stationary 3 kg cart at the bottom. The spring constant is 400 N/m. What is the maximum compression of the spring? How far up the ramp will the first cart travel...

Hi guys I have a general query regarding Rubber O-rings. For an application , say seal between 2 mating flanges of pipes ,with water pressure say about 10bars, How exactly does the hardness of rubber effect the the sealing? Is there a direct relation between hardness & strength ? Can some...

Hi, I have a little problem understanding adiabatic compression. Let me start with the definition of adiabatic process from wikipedia, "In thermodynamics, an adiabatic process or an isocaloric process is a thermodynamic process in which the net heat transfer to or from the working fluid is...

So, I'm launching foam balls using spinning wheels. The way it works is a sheet of polycarb is near the wheels. The ball is fed into the wheel and is compressed. The wheel turns and shoots the ball out. My question is this. How should I calculate the output velocity of the ball? I know the...

If a sugar cube size piece of neutron star weighs as much as every vehicle in U.S.A, and H2 in the core of Jupiter has been compressed to a metalic version of itself, what then is the limit of compression? Can matter be compressed further than that of a neutron star?

Howdy all, I have a final coming up, and I'm having a very difficult time grasping a few concepts about the ideal gas laws, specifically a problem with isobaric compression. Homework Statement Alright, the intro to the problem is: A quantity of ideal gas is slowly compressed to 1/3 of...

rms velocity and compression. Please help! Homework Statement Explain why the rms velocity of a gas increases when it is adiabatically compressed. Homework Equations None The Attempt at a Solution I know that compressing a gas decreases the volume, but I don't know details on...

Hi doing a group project on making tea candles! Silly topic but anyway... my part is to calculate the pressure needed to make a candle and having trouble with the calculations... final dimension needs to be a 38mm diameter and 16mm height using rotary compression to do this... candle...

Homework Statement http://img62.imageshack.us/img62/9815/mechmatt.jpg P = 235 kN d = 50mm (diameter of the axis) t = 20 mm t1 = 12 mm Safety coeffecient = 2.0 σy = 320 MPa Check the axis for strength (shear and compression) Homework Equations...

Homework Statement I decided to revise my mechanics course and came across a problem involving a system with three springs (say, different k's) and two masses (say different). The s1-m1-s2-m2-s3 system has the outer springs connected to walls of infinite mass. I was interested in what...

Homework Statement The question I am stuck on is "0.253 m of gas is compressed isothermally from a pressure of 1 bar until its volume is 0.0313 m. Calculate the heat energy transfer. " Homework Equations I understand that work done = Heat transfer because it is isothermal but the equation...

Block 2 (mass 1.10 kg) is at rest on a frictionless surface and touching the end of an unstretched spring of spring constant 144 N/m. The other end of the spring is fixed to a wall. Block 1 (mass 1.70 kg), traveling at speed v1 = 3.60 m/s, collides with block 2, and the two blocks stick...

Hi guys, I'm doing some calculations on a vapor compression cycle system for my Master Thesis. My question is: Does the mass flow change when the refrigerant flows through the (electronic) expansion valve (assuming steady state flow)? I assume that it doesn't but I can't seem to get...

I am quite inexperienced with actually using mixers, so when I was bombarded with specifications by a data sheet I was a bit intimidated at first. I think I have learned what most of the metrics mean thanks to a great deal of resources available online. I just have one question. The data sheet...

Hi! Could you help me, please, in a hypothetical situation that involve advanced physics knowledge? I am going to write a science fiction novel, and in order to avoid major scientific mistake, I would need your help. Is it possible, according existing physics theories, to find in cosmos an...

Homework Statement A horizontal spring with k = 71 N/m has one end attached to a wall and the other end free. An 95 g wad of putty is thrown horizontally at 3.7 m/s directly toward the free end. Find the maximum spring compression. Homework Equations W=1/2kx^2 The Attempt at a...

I need to install 4 bar stainless steel piping system (40 meters length, 20 Tee, 40 Elbow) . do you recommend using compression fittings or welded fittings. I know that compression fittings is easy to assemble but they have leakage problems. Butt-Welded fittings on the other hand would...

I have always thought of gravity as being a phenomenon related to matter. I have always envisioned it as a "contraction" in spacetime reaching out in all directions from an object. What I mean by contraction is that the closer you get to a body of mass the more spacetime is compressed. Due...