What is Safety: Definition and 291 Discussions

I live in AZ so besides the "bubla" or whatever that stupid name is for a huge wall of dust we get that's crazy huge is about as bad as our weather gets. Basically Solar Flairs are the biggest threat to me and my dog, so its my the natural disaster of choice when thinking about different...

Let me start by stating up front that I am not an engineer, but as far as I could tell, this "outsider" question does not violate the forum rules. I searched (Google and this forum) for an answer, but couldn't find one, and was confident readers of this forum could probably help. My boss's...

Howdy folks Pardon any implicit or explicit stupidity in advance. I'm an EE major taking a class in Autodesk Inventor, and I'm probably going to do a motorcycle frame for a midterm project. While it will not be required, I'm curious to see if I can make something roadworthy. Does any...

am doing my final year project on designing and constructing the device i have named up there. It is an electronic device which is to be attached with the discharge rod and give an appropriate signal if the discharge process was successful or not. The challenge is, the device is to be used...

On several occasions, I've seen the demonstration where a person holds a fluorescent light bulb up to a tesla coil, and it illuminates. And in general, demonstrators don't seem too worried by the sparks generated. But I was looking at this page, http://www.pupman.com/safety.htm and was...

Greetings. Where can i read about safety and failure modes of supercapacitors? What kind of currents would be safe, if not marked? What would happen if that current is exceeded? What would happen if a charged SC gets short-circuited, briefly or for a while? Can anyone help, by...

Hello everyone. I am starting my degree in chemical engineering after a 10 year hiatus from school and need some suggestions on some high-quality safety glasses for the various labs I will encounter along the way. What I am mostly concerned with at this point in time is the quality of the lenses...

hey I'm a high school student which majors in science (physics) and to pass my grade i need to make an essay paper including the problem, experiments, and of course conclusion. But I can't make up my mind of what topic should I make. And one thing that gave me an idea is about car safety, does a...

So, I had this idea for passive safety. Break-apart rods (zirconium with low-melting point metal inserts for example) which go through reactor core at regular intervals, are tensioned by springs, and in the event of overheating, are torn apart, operating simple (springs, latches) mechanisms to...

From http://arxiv.org/abs/1112.2415, "Planck scale Boundary Conditions and the Higgs Mass", I learn of http://arxiv.org/abs/0912.0208, "Asymptotic safety of gravity and the Higgs boson mass", which predicts a Higgs mass of 127 GeV as a consequence of the vanishing of the Higgs self-interaction...

As part of my junior curriculum I'm taking a college prep course. As part of this course I am gathering a list of colleges I plan on applying to, including several safety schools. I have several schools that I am totally confident that I will be able to get in, but I wouldn't quite call them...

Homework Statement Designing a safety pin for gate valve, picture is attached! Material: EN24 (λ=680MPa and E= 207 GPa) Total distance between supports = 98 mm! Force applied by gate is 64705 N! Question: Minimum diameter of pin for 1) No shearing , 2) a maximum deflection of 1 mm...

Hey guys, My understanding of circuit analysis and the like is very minimal, and I have had a certain lack of understanding about something for a long time, and I feel I need to get a solid answer. I understand the fundamental difference between a voltage or potential difference and a...

I'm doing a physics assignment on safety devices such as helmets and i need help with a question. Why is the Impact force reduced for a helmet with a soft interior VS a hard interior? I know it is because the soft padding on the inside of soft the helmet will reduce the time taken for your...

Hello, I'm trying to learn about LiPo battery pack safety and was wondering if anyone could head me in the direction of some good sources of information. In particular I'm trying to learn enough to safely re-build and extend a laptop's 6-cell (3S2P) pack, but hopefully to extend it to a...

Homework Statement Hey everyone, I'm trying to do this question and have no idea where to go with it. http://dl.dropbox.com/u/630750/Screen%20Shot%202011-11-02%20at%2014.17.42.png Homework Equations See below. The Attempt at a Solution Here is my attempt/thinking so far...

I'm doing a report and for one of my topics what dangers are there in the paper and pulp industry?.Also what safety precautions have to be taken in the paper and pulp industry when manufacturing?.Please be very detailed if possible.Thanks

I'm a senior undergrad and will be applying to grad school soon. The field I'm interested in is experimental high-energy physics. There are already about six schools I'm looking at applying to, but I'm wondering if anyone has any advice about possible safety schools. My overall GPA is about...

Hi Im happy to find the forum, I hope you can help with my questions. I have found this calculator and would like to understand how it works - can anyone help with this? The webpage is -...

What is the difference between BWR and PWR in the case of SEFs?

Homework Statement An architect who is building a skyscraper comes to see you. The architect wishes to place a safety net on the skyscraper, to prevent damage or injury should any of the building's decorative features be dislodged by wind or other forces. What advice can you give her on...

Norway held nationwide municipal and county elections today. The outer "fringe" parties, the government coalition party Socialist Left and the "bad boy" nationalist/libertarian Party of Progress were the big losers, with about a third of their voter bloc abandoning them this time. The great...

Homework Statement Q: A beam has a solid square cross section of 100 mm and is simply supported by two supports 3 m apart. Calculate the dead load that can be safely supported when applied to the middle of the beam. * The question doesn't state material but I'm informed that it is mild steel...

Homework Statement I just want to know the difference between certain equations for shear stress. I'm trying to find the factor of safety for pins that are in double shear and have a circular cross section. Homework Equations So far I've used stress = 2F/pi*d^2 for double shear...

Interesting posts from Georg von Hippel at http://latticeqcd.blogspot.com/ Monday, July 11, 2011 Lattice 2011, Day One "Next was a talk by Jack Laiho on Asymptotic Safety and Quantum Gravity. The concept of asymptotic safety as introduced by Weinberg states that a perturbatively...

Hi, MRI safety manual says that whenever you are scanning a patient with a certain surface coil you should remove all unplugged coils from the bore during the scan. For example, if you have a head/neck + spine coil matrix with two coil ports and you are scanning only the spine part then you...

Hello Everyone, Below is a self assesment question I found in a study guide related direct and shear stress, it is in 2 parts. The guide only gives the answers. I managed part 1 but for part 2 my answer differs from the given safety factor solution of 7 mine is 12.5. In my attempt below i have...

Hello all, What are some safety physics grad schools, preferably in California. (I have 3.4 GPA). I'm going into spintronics/condensed matter. Right now I am applying to UCSB, Stanford, UCB, Caltech. Obviously all are quite a reach for me, so I am looking for some good safety schools...

Hello, I am doing a small research investigation into whether Nuclear Fusion will provide a safer and as efficient energy source as current Fission technology. Just interested if anybody has opinions on the topic and what their stance is on Nuclear Fusion, do they think it can work, any...

In building a crystal radio one thing that comes up everywhere I look is the phrase. "A good ground is as important as a good antenna". So you have your circuit. Capacitor, Inductor, diode, resistor and headphones in series. Have a long wire just hanging from one place as a long wire...

I've been thinking abut getting some MOSFETs to play around with (my classes skipped right over that particular section), specifically some http://www.fairchildsemi.com/ds/2N%2F2N7000.pdf" from Mouser. However, I've read in my textbook that MOSFETs, because of their insulated gate, can be...

Today I was doing a problem (physics) and ended up with the a differential equation dT = -µ T sin(dθ) (Where µ is constant) I wasn't sure what to do with the sin(dθ), so I used the small angle approximation of sin(dθ) = dθ. I would think this would be a perfect approximation because dθ is...

A couple questions. 1: Does US have anything similar to KHG? US robots on site in Fukushima - one with digital radiation monitor, other looking at first through camera - is that what US would use at US reactor accident? Is there a shortage / unavailability of such equipment for US-built reactors...

"Egg Safety Vehicle" (Egg Drop Project... in a car!) Hey! This is my first post so sorry if I do anything against protocol. I need to design a sort of egg protection vehicle. I will put the egg inside of the car which will in turn be rolled down a ramp and crash into one of my classmate's...

Homework Statement Hello, I've been given a question: The ultimate strength of a round steel rod is 560MPa. If a factor of safety is 6 is required, what is the maximum permissible load for the rod if it has a diameter of 6.9cm? If anyone can explain how to set up this...

5 fundamental circuit components or functions and what are some safety functions that are performed in most practical power circuits? thanks:)

why is it important to secure the connections of starter to batteries? does the size of wires matter in this? im not sure how exactly starting works so I am totally clueless here also, why is it important to disconnect the load first b4 starting/shutting down the generator? well it kinda...

Homework Statement Two different materials are being considered for a safety pad below a swing. Material 1 has a Young's Modulus twice that of Material 2. Which should be chosen? A. Material 2, because the length over which the impact force acts is larger, resulting in a lower average...

Hi, I am wonder if anyone can explain to me in details about the definition and tasks of a radiation safety specialist. Assuming the work site is a hospital, what are the major task and duties for a radiation safety specialist. Is there any good resources I can look into? Thanks.

**factor of safety** Homework Statement Im having problems with this, any help would be much appreciated http://i826.photobucket.com/albums/zz190… The material for the bolt shown in the angled joint above has an ultimate tensile strength of 218 MPa and a shear of 230 MPa. The...

What are the main safety considerations during design of a pressure relief valve? and how would you go about diagnosing if they are incorrect? Is the following correct? Orifice diameter for a fixed pressure - How to diagnose if it wasn't correct? What effect would a incorrect system...

I'm an engineering physics student writing a mock proposal for a class. I've based the proposal on a specific company that builds reactors and trains personnel for navy vessels and off of this article: http://www.world-nuclear-news.org/nerliste.aspx?id=11724 Essentially it says that during...

im working on a question that requires me to calculate the minimum shaft diameter for a maximum shear stress. the value is 80mpa. The factor of safety is 1.5, now I am aware that i can't simply increase the shaft diameter by 1.5 to do this correctly. Should I calculate a suitable diameter for...

Hi all, I'd like some help calculating laser eye safety for a 905 nm diode laser system I'm building. It's for a scanning laser rangefinder and I need to figure out if my current design (a TOF rangefinder) can be feasibly be made Class 1 eye safe. The eye safety calculations are a little...

Hi all, I'm new here and new to physics all together. I am taking a general science class in college (real basic stuff) and have only been focusing on physics for 1 term so I am pretty ignorant on the topic. We have an in class assessment dealing with cars and their safety features...

dear all i just want to ask about, switchgear that according to the calculation of short circuit currents have Isc 53 kA, but the circuit breaker that used has a Isc 40 kA , whether this condition safe for my system? thank you.

Hi, I am a new member here... I am a Doctoral candidate. I am looking for suggestions on research topics for a Ph.D. thesis in "Health and Safety in Nuclear Organisation". I would appreciate any ideas that you might have on topics that you might feel are worth considering as a result of your...

Following to close while driving is a deadly mistake. Two seconds, I think we all deserve them, plus it is the law. For those of you who don't know how to tell, at sixty five miles per hour it works out to be about one of the dash lines that separate the lanes per half second between vehicles...

10 CFR 50.46 gives the acceptance criteria as the required condition for the performance of ECCS. There, it is indicated that PCT (Peak Clad Temperature) must be below 2200F. On the other hand one can rarely find an accident analysis for NPPs with the result of the analysis showing the PCT...

Hey all, When it comes to arc lamps, it looks like the safety concern everybody talks about is in regards to UV exposure. This, however, seems to be more suited for Hg sources instead for Xe sources. My question is in regards to whether there should be any concerns with the IR portion of the...