Break Definition and 293 Threads

Okay, here is a question that I have not been able to get answered. My Grandmother, when she was alive made crafts out of broken glass. The goal was to have broken glass with no sharp edges. These are the steps. First she would heat the bottle in the oven. Then she would remove the bottle using...

i am trying to spproximate a PDE in the form below using the lax wendroff 2 step method in MATLAB coding: [h ; hu ] = [ hu ; hu^2 + 1/2gh^2] = [0; -ghbz] (where bz will equal zero) i believe this is then the case d(h)/dt + d(hu)/dx = 0 and d(hu)/dt + d(hu^2 + 1/2gh^2)/dx = 0 as...

Homework Statement A car travels on a horizontal street, straightforward. In some moment of time (t = 0), having a velocity of 20 m/s, the break is hit. It is required to find the time and traveled distance before the car is still standing. The friction coefficient between the wheels and the...

Problem statement: So, my girlfriend's coming back after winter break and she texted me all of a sudden last night to say, "Can you not stay over until I'm ready? I'm kind of stressed for no reason and need a break." I don't know if it's bad phrasing on her part, but "need a break" sounds...

ok, if angual velocity ω = linear velocity v / radius r therefore ω=v/r but what if i have ω^2 ( to the power of 2 ) does ω^2=v^2/r^2 or does it eqaul ω^2=(v/r)^2 many thanks, this is really bugging me and preventing me solve a problem since I am not in class

So as far as evidence is concerned, entangled particles determined each other's state upon dis-entanglement instantaneously, so if we have one particle on Earth and another particle near a black hole, it wouldn't it still happen instantaneously? Would about inside a black hole?

Knowing that its possible to break a glass if you emit a loud sound at its resonant frequency. If you do the same for Human skulls, there will not only be a sound sleep, but a sound death too. Is that possible?

Hi. Situation: A pipe with a cut out so it will break when a shear force is exerted at the top of the pipe. The break point is at the cut out and the the force is impact in lbs. What is the wall thickness(or cross sectional area) at the cut out point? I know i may be missing variables...

I have a two questions. 1. What is the force (not energy) required to break the H-O atomic bond? 2. What is the minimum additional distance required to separate the H from the O to consider the bond broken? From this table I see that the energy of the bond is 459000J/mol and the radius of...

I have a two questions. 1. What is the force (not energy) required to break the H-O atomic bond? 2. What is the minimum additional distance required to separate the H from the O to consider the bond broken? From this table I see that the energy of the bond is 459000J/mol and the radius of...

basically, I am trying to reduce vibrations from my break barrel air rifle which has dual recoils in either direction. they happen almost simultaneously, but it still throws off my accuracy as one occurs just before the pellet leaves the barrel. the kick isn't strong but rather sharp. here's a...

What is the realistic break down value for E field in air. Text books say its 3*10^6 V/m But there are many websites, which go down to 1*10^6 V/m. If there is a dielectric like FR4, then the break down increases V=ε E*d ?, where ε is the dielectric constant for FR4.

Given: - Entropy is the measure of ordered states of a system. - At the creation of the universe from the Big Bang event, all matter was in a more primitive form (eg: quarks instead of hadrons). - Dark Energy is providing a mechanism by which the universe may forever expand. Hypothetical...

I was splitting some wood the other day with an old maul and the maul broke. I was wondering if anyone knows of a formula to predict or give a sum of the force needed over time to break said maul. so what i really want to know is how many times can i hit something with 600lbs of pressure with...

Please forgive me if this is a stupid question; I know embarrassingly little about chemistry. I'm just curious as to whether water breaks down or not: if one leaves out, e.g., a piece of bread , within a few days, the bread will become moldy, i.e., it will start breaking down (same...

Homework Statement I haven't done this for several years and have forgotten. Kicking myself now over it since it looks like something so simple but i cannot figure it out... I need to break this second order ODE into a system of first order ODE's in matrix form to use within a crank...

So with the national agenda focused like a laser on austerity measures, how do we get out of the liquidity trap that is killing our economy? Many people are hoarding cash instead of investing in the market because they are afraid to invest in a weak economy; however, the economy is weak because...

Homework Statement What is the upward force required to make pipe start to move? There is a fixed point and a 36 inch shaft. The force would be applied 36 inches away to the point. The load is 1700lbs. The end point only needs to come up enough so that the static friction of the pipe is...

so I am just finishing up hawkins a brief history of the universe, and while dated, it was a good read. I am looking for something to break me into quantum mechanics. everything i see/hear about it intrigues me and i need to know more. i need advice on a good book to break me into it. I am not...

Homework Statement I am just wondering because i saw this show (cartoonish) where this guy jumped from an apartment of 7 floors (I say it's about 30m tall?) into the water (for some reason the apartment is build over the ocean). Here is a picture. I wanted to use spoiler because it is kinda...

Hello, First let me tell you that I'm not so experienced in SAS. I was given a task to find a structural break in labor productivity using the following regression model: Labor_Productivity = Unemployment Oil_Prices Real_Interest_Rates. When I use growth rates, which I was...

Hello, I am attempting to build a control system including foul line detectors for a bowling alley. I am a Computer Engineering student, and while I am really good at the software side of things am a bit lacking in the hardware side. I was wondering if I could get any help in creating this...

Hi all :) There are some questions troubling me concerning mechanically controllable break junction electrodes. Generally, what happens is the bridge between the electrodes is opened by bending. At a certain point the bridge is broken and the two sharp electrodes are formed. So, my questions...

First off, I would like to apologize if I'm posting this in the wrong sub-forum. Anyways, I'm sorry if this is an ignorant question, but I am curious as to whether the 4 fundamental forces (electricity and magnetism, gravitation, strong, and weak) would theoretically continue to break down...

hi can somebody explain this notation to me Let M be the minkowski space, then there is a space: TM* \otimes TM* For some reason, this latex code does not work: TM* (tensorproduct) TM* I don't really get what this T tells me? Can somebody explain this to me?

Would it better on winter break to take the time review stuff from Intro Physics I & II or to start reading ahead into next semesters work? I had thought of doing an intensive review of Intro Physics I & II since it has been a year since I took that sequence and will now be resuming physics...

How fast must a human throw a baseball in order to break the sound barrier? I know a jet breaks the sound barrier at approximately 750 mph but would it be the same for a human?

Homework Statement This happened in real life, rock breaks through single pane safety glass and travels 9 meters, safety glass is 3 meters high. rock was 1 kg. I need to find the rough KE before the rock hit the glass. The MPa of the glass i am guessing is 50, google has yielded me little on...

I live on the opposite side of the globe from where I'm studying. So I figured I'd save about $2500 of air travel if I stayed for winter break - that's a lot! However, the dorms at my school are closing during the winter. I'd really love to find something meaningful to do during the winter...

Homework Statement An object with total mass mtotal = 20 kg is sitting at rest when it explodes into three pieces. The first piece with mass m1 = 5 kg moves NW at an angle of θ1 = 20° above the –x axis with a speed of v1 = 30 m/s. A second piece with mass m2 = 4 kg moves SE at an angle of...

Hey, Can someone point me in the direction (or just explain to me!) the idea of Anode Break excitation in neuroscience ? Thanks

Ok, in about a month I will be a freshman at a small university in South Carolina studying physics. I just got found out that I passed that Calculus I AP test so my next class in college should be Calculus II, but due to some major scheduling issues I will not be able to take Calculus II until...

Im new and not that advanced in science so can you try to keep your answers simple. My question is can virtual particles break the law that energy cannot be created or destroyed? Have virtual particles been proven/observed? thanks in advance for your answers

I'm trying to run a simple regression for a data set (n=165). I've determined via a Chow Test that there exists a structural break somewhere; the same least squares estimate cannot be accurately used to represent the entire range of values the explanatory variable takes on. I've found two very...

Homework Statement Note that in the following, 4\pi means 4 * pi not 4 ^ pi... A circular loop of wire of self-inductance L and radius r carries a current I. If T is the tension in the wire for which it will break, show that T must be greater than (I2/4pi)(dL/dr) Homework Equations...

Hope this is the right place for this question, but it is very inetresting to me so I wanted to ask some experts. Can a propeller driven aircraft break the sound barrier? My answer, no. Any opinions will help Thanks

#8: A person walks 60.0 m east, then 80.0 m NW. #9: A person walks 15 m west, then walks 7.0 m @ 15 degrees South of West. #10: Two forces act on an object. A 45 N force pushing to the north, and a 70 N force pushing at 20 degrees to the east of north. #11: Some people go for a walk...

Hi Everyone. I am trying to find out when this paddle (in red) would break due to the force of the drag of the water and from the force of the pneumatic cylinder that is pushing it. I took intro to statics but as you can see with the figure the machine is not static. Can someone point me to the...

How do you insert a break using latex? Homework Statement all my equations come out on one sinle line.. please help?? Homework Equations The Attempt at a Solution

Summer break experiment Fun! Hey I'm a first year physics student going on summer break and i was wondering if anyone had cool physics experiments i could do to keep my physics knowledge fresh (so i don't have to do JUST problems on paper)?? and kinda get some hands-on.

Hi, I am studying control engineering and we are covering root locus concept right now. My knowledge of this concept is varied..I get some things and others I don't. One thing I don't understand is the difference between centroid and breakaway/in point. So for example for this function...

Just watching the live feed from the LHC and as if the black hole it was meant to create was speaking to us, it broke on queue. Seriously..is this thing not the biggest piece of junk ever invented? Obviously it is complicated beyond the scope of this forum..but with scientists studying it for...

My friend and I were talking , and my friend said that the laws of QM break down at large scales , But i was thinking that they don’t break down the probabilities just become smaller and it becomes harder to use QM . So what do you guys think

I was just wondering, is there any equation which predicts when does a stream of liquid( e.g water, ethanol) break into droplets? i think it relates to the speed and diameter of the stream, probably also with diameter, but i cannot find any equations which governs the rule

Would it be possible to break concrete into rubble with sound? if so, How much energy would it take? Forgive me if this is a stupid question, I am not a physics guy but am trying to learn. Joe

I need a list(data numbers) of short range IR emitter and detector(not very expensive) which can be used as a break beam sensor.. I also like to know what is the specific IC number which is used to tune the IR emitter's frequency which matches with the detectors receiving frequency. I have heard...

Hi Got a question, hoping someone can give a good explanation for. We all know that large static uniform electric fields have the potential to ionize. (Dielectric breakdown of Air - Static Electricity Shock). In the Quantum picture, why does this occur. Take for instance the photo...

Homework Statement Hello, I am having trouble with this program. I would not need a complete code.. but instead just some words that would point me in the correct direction.. or how you would go about solving it. This is the problem. The file contains lines like the following...

Homework Statement Okay, basically I had a bone in ballistic gels, and I dropped a hexagon (6 sided) weight with the measurements of 1 and 1/2 inches per side from 1 feet, 1 1/2 feet and 2 feet on the ballistic gel enclosed bone. Basically I will need a formula to calculate the psi that he...

In superconductivity, Meissner effect describes the expulsion of magnetic field. Could this be described as a breaking of the electromagnetic force in the way that the higgs field breaks electro-weak force?