Break Definition and 293 Threads

Hi, I need to make a demonstration that shows that white light is composed of different colors. I do not have a prism, and will not be able to obtain one in time. I have a white LED flash light, and I tried some improvisations with different objects (bottles, glasses etc), but none seems to...

Homework Statement The graph below shows all of the quantized energies (bound states) for one of these molecules. For this molecule, E0 = -2.5 eV, E1 = -1.20 eV, E2 = -0.72 eV, and E3 = -0.30 eV. What is the minimum amount of energy required to break a molecule apart, if it is initially in the...

I haven't had a break for several years now. Due to some circumstances I take about 13 classes now. Most of them are important (QM, particles, ED, solid state, general (EM and waves), numerical methods), some of them not but still require work. And labs. I still manage to get As - somehow. But I...

I have never been particularly fond of math. It's not that I'm bad at it, I just don't enjoy it, and have been procrastinating taking any math classes as a result. Unfortunately, my procrastination has finally caught up to me, and I am faced with a calculus-based microeconomics class that I...

15 balls are racked in a triangle. They are all alike and each one is touching its neighbors. Ignore friction and assume all collisions are elastic. You break by hitting the apex ball hard with the cue ball, as for a game of 8-ball. Assuming you know the velocity of the cue ball and where it...

Please help, URGENT Hi guys, Sorry if I’m posting In the wrong place, I’m a newiee:D I have a problem (seriously, it is not homework), no equations, no numbers, just a mechanical question. I’m trying to break a rod for instance (The rod has the same diameter althrough except for one point...

Hi there, We have a plant that manufactures iron furniture. The iron bars come from the provider plant with a cover of mineral oil. After cutting, folding and putting together the pieces, there is a rinse process with water and detergent to take out the oil cover. The remaining emulsion of...

I've been thinking about this question for a little while now and figured maybe a good answer here would help to resolve it. Can glass ever break diamond? Some people I know say it's impossible and yet I am left thinking that it is just a matter of how much power is generated by the impact of...

A 630 gram rock is whirled on the end of a string 49 cm long which will break under a tension of 20 N. a) What is the highest speed the rock can reach before the string breaks? (Neglect gravity.) V=M/S T- mg= ma T-mg= m(v^2/r) solve for v i get 2.188 m/s (which is wrong)...

Say you had a really successful campaign to get everybody to turn off the power in their house at a certain time without the power company knowing it was going to happen. Would this cause something to break?

Homework Statement I want to solve this equation: 8x - (3x + 2) = 2x - 10 2. The attempt at a solution I tried this: 8x - (3x + 2) = 2x - 10 (3x + 2) = 2x - 8x -10 (3x + 2) = -6x - 10 I know how to break parenthesis when there are no signs between a number and the...

Has it be done? And what's the sound barrier in space and can it be broken?

\frac{1}{x^3(x^2+1)}=\frac{ax^2+bx+c}{x^3}+\frac{dx+e}{x^2}\\ ax^4+bx^3+cx^2+dx^4+ex^3=x^4(a+d)+x^3(b+e)+cx^2=1\\ c=0\\ b+e=0\\ a+d=0\\ i got 4 variables with 2 equations what to do??

6AM 1 set of ribs (3 racks). Cook time: 4 hours 9 AM- 10 lbs beef brisket Cook time: 9-10 hours 2 PM 2nd set of ribs (another 3 racks). Cook time: 4 hours. Using mesquite chips to smoke. Who likes BBQ?

\frac{1}{s(s^2-1)}=\frac{A}{s}+\frac{b}{s-1}+\frac{C}{s+1} i get A=-1 B=-C A+B+C=0 where is the mistake

Firstly, I want to note I'm a post college student who is attempting to teach himself calculus. I'm reading Calculus Made Easy by Silvanus P. Thompson and Martin Gardner, St. Martin's Press, 1998 ed. My question comes from page 56 Case of a Negative Exponent y + dy= (x + dx)^-2...

Hi, having a problem with this question. I thought it was as simple as the conservation of energy, but I guess there is something I'm missing. The program we're using isn't accepting my answer, even when I use two significant digits. Thanks for the help, Cohort Homework Statement From...

I know you can use fueses, switches, and circuit breakers. But is it possible to use a logic circuit to break a circuit path?

Homework Statement I am working on a physics project about karate, and I want to know how fast I would have to punch to break a practice concrete slab. I know that the slab requires 1900 Newtons to break. I also know that my arm has an approximate mass of 8.4 kg. I also know that my arm is...

I am designing a structure that can rest upon jelly. I know how to determine the surface tension of the jelly in N/m. I can convert this to dynes/cm, J/m^2 etc but that is'nt the problem. I need to figure out the maximum weight of the structure so that its force on the jelly does not break the...

The thin metal film is scored with some pattern to 50-80% of its thickness. When exerted shear stress, the film will crack/open at score. I wonder what simple/practical techniques can be used to detect its pinhole or opening in real time?

Just got back from Moab, Utah this evening, where I'd been for the latter part of my break. Went to MUnifest (mountain unicycling) and did some mountain biking. Will try to get some pics up.

I've been doing some problems relative to car on an incline (and also boxes on an incline). Let's suppose we are given a problem with kinetic or static coefficient. I'm confusing when should or should not apply kinetic friction to a car, for example in some problems if brakes are applied then...

I had big plans, I was going to get way ahead in all of my courses over spring break, yet here it is Thursday and I am just cracking a book for the first time. I guess I did need the break. But I feel like an idiot now I'm making all sorts of stupid mistakes and I feel like I've been out of the...

Spring break is almost over... I spent almost my entire spring break in the lab catching up on my research project (I'm a nerd) and helping some friends with their stuff. This past week I had been putting in about 14 hours a day, a lot more than I usually do when I'm not on break. I'm glad we...

Here's a no brainer for you guys... Suppose we have an ideal straight wire lying on the table. Then we pull it with equal forces on both sides. Let's say we start from zero force and then gradually magnify the force. A one point, the wire would break. But, where would it break? As the...

hi, was hoping to find some equations or method to find the force needed to break the bonds of a cell that is attched to a surface. I have the force that the cell is bonded with and therefor the force needed to overcome to detach the cell. however it is the overcoming force i need to find. The...

Hi, I am in college and intending to go to grad school after I finish my undergrad degree. However, I've been wondering if it would be feasible to take a ~4 year break in between for personal reasons. I recognize that some sort of review would be needed before I resume my education, but to what...

Hi again, I *think* I am having a problem with break, as I can't figure out why I am having the problem I am having. This code is meant to compare 24 integer 'traits' against 48 minimum and maximum values, and if all 24 fit within their respective min and max value, to exit the loop. If the...

Ah.. been coding and waiting for plots for a couple hours. Time to chill for a bit... What to do?

We have been discussing this topic with my classmates recently, and I find it quite interesting, so I also want to ask you guys: 1. For how long can you study without taking a break? 2. How long are your breaks? 3. What do you do in the breaks?

The thread on mass and force made me think... Most units in mechanics can be broken down into a combination of length, mass, and time. eg. power = mass * distance * time^-2 * distance * time^-1 (force*velocity) Is there any way to break the culomb down into mass, length, and time?

Suppose you have a long wire. One end of the wire is close to a very very strong source of electric field. It is my understanding that the electrons responsible for bonding in a metal are also those responsible for conduction. If you have an extreme electric field near to the conductor, and...

I've heard a saying that some fighters in blackmarket boxing could do this incredible thing. Is that true? Do you have any detailed proof of that? Aren't their legs made from protein?

http://www.sciencedaily.com/releases/2008/11/081114081213.htm Up to now, industrially-deployed motors have normally reached 250,000 revolutions per minute. Now, however, researchers from ETH Zurich’s Department of Power Electronics have developed a drive system in cooperation with its...

Hello I am currently a pure math major at a top level university, and I am basically committed to attending grad school. I am in my junior year right now. I am planning on taking several graduate courses as electives during my senior year. My question is whether I should apply to grad...

Another question: A lot of people have discussed the idea of a year off between undergrad and grad. school. My question is, would it be looked upon negatively if during my 1-2 years off I did something not directly physics? I'm considering doing a Master's in the Philosophy of Physics, which...

Bond Enthalpies..please help! Got the first one, but can't figure out how to do "b" and "c." Not understand which ones make/break. http://rapidshare.com/files/157266091/Enth.jpg

Homework Statement Write out expressions for the rotational speed (at the equator) and rotational period of an object mass M and radius R that is spinning at the break up velocity. Homework Equations F= mg F = m \omega^2 r g = \frac{mG}{r^2} The Attempt at a Solution So i...

If I build a tower - let's say, on the equator - and every so often, as the tower gets higher, I drop a stone from its top. Presumably, as I get fiurther away from the Earth's surface, each stone will accelerate towards ground at a lesser rate than one dropped when the tower was lower. How high...

So the lead of the pencil is made out of graphite, when i break the graphite what sort of bonds are broken? intramolecular or intermolecular bonds? thanks in advance.

I have a very important qs to ask on relativity. Picture this: 2 person "A" and "B" : A is stationary and B is moving in a rocket (lets assume a half transparent and half white painted "rocket") at the speed of light TOWARDS A. But B is holding 2 touch light one shining straight at the...

The classic physics problem example of symmetry breaking is a pencil sitting directly on its tip (pointed down), but it's possible for the pencil to balance on its tip if we reduce the thermal fluctuations to zero by cooling it to close zero degree. Quantum fluctuations require/mean that...

Homework Statement A moderate force will break an egg. However, an egg dropped on the road usually breaks, while one dropped on the grass usually does not break. This difference is because for the egg dropped on the grass: A- The change in momentum is greater B- The change in momentum is...

I'm currently finishing up my third year of university, set to graduate in a year or year and a half with a B.S. in mathematics. I'd like to go on to graduate school, but I'm beginning to have serious reservations. Mostly I'm concerned that I will not be able to get into grad school; my GPA is...

Does any formula gives invalid results at infinity or zero compared to other values in the formula? I tried as an example some calculus at normal values gives answers and at infity and zeros the rule is broken... I think it is a must to formulate 0 with infinity and i don't know how...

Hi , please can anyone help. I need to know what chemical i could use that when drawn on a glazed ceramic tile it will break in the exact place. thanks stuart

Homework Statement in order for a well to supply 4.5 million litres of drinking water per day, at a minimum total hardness of 60mg l-1 as Ca, calculate the daily throughput of the reverse osmosis plant assuming that 30% of the feed to the plant comes out as reject. Homework Equations a...

When coding, why is exiting a loop using"break;" bad? when coding, to exit a loop i was told using "break;" (in java) is really bad...why!

Hello, I have been looking this thing up for a couple hours now on google and textbooks. So far, I got nothing... When you use a fuse wire in a circuit, why does the fuse wire always melt in the middle? I don't see how the middle of the fuse wire gets hotter than the ends unless the middle of...