Break Definition and 281 Threads

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?

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...

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, 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...

So I managed to break my fibula/tibia at the end near my ankle. I managed to do it, while, of all things, dancing. I was just doing my normal thing, doing a turn, I think I hopped just a little bit, heard a SNAP, then I was on the ground immediately. I heard someone freak out (I felt no pain...

[SOLVED] Some of my Winter Break physics problems Hey guys, I'm new to this site, and as the way things are going with my physics class, this won't be my last request for help lol. Well anyway, our teacher assigned us a few problems to do over break, and since I have a week left I decided...

Ah, Finally. Winter break has rolled around. Tomorrow is my first day of winter break a free man. Over the break I want to cook, eat, cook, eat, cook, eat and cook some more! But the problem is I don't really know anything about cooking, and I need some ideas on some foods to make and eat. I...

Question A stuntman lands safely in an air bag to break his fall from the top of a 6-storey building. Explain how the air bag reduces the risk of the injury. Attempts The air bag provides a longer duration for the force of the ground to act on the stuntman, hence the impulse is lesser, and...

Homework Statement The problem asks to determine the break frequency at the base of Q2 (which is fine I have no problem with that), but the whole assignment never asks for the break frequency at the COLLECTOR of Q1, then later asks to produce a bode plot of the transfer function. See the image...

Homework Statement A 1000kb steel beam is supported by two ropes. Each rope as a maximum sustained tension of 6000N. Does either rope break? If so, which one(s)? http://img101.imageshack.us/img101/3930/diagramgm2.jpg Homework Equations Tension = M cos/sin theta (in this case it is...

The following is also posted in the Chemistry forum. This is a cross-post. If this is not allowed, it's fine with me if this post is deleted by an admin. I would like to know how to predict when a flow of liquid---dichloromethane, actually---freely flowing downward through a small hole...

I would like to know how to predict when a flow of liquid---dichloromethane, actually---freely flowing downward through a small hole (varying from around .05 to .001 cm) will exit as droplets instead of flowing in a steady stream. I have been bouncing around the Internet for a good while now and...

One difference between GR and LQG is that LQG is chiral, whereas GR is not. In order to break the electroweak symmetry, a higgs field needs to be introduced by hand. Einstein's understanding of inertia implies a strong EP as gravitational mass and inertia are identical, while a higgs...

Optics and bio research hi yall! im doing a neuroscience research on the circadian behavior of different species of fishes, and i need a device to measure activity levels of fish under different light conditions. one of the mostly used method is to have a light source (IR or something else)...