Works Definition and 435 Threads

Forgive my ignorance here, I'm not a physicist, but the exact nature of gravity beyond the Event Horizon has me a bit stumped. Say I cross the Horizon of a Supermassive Black Hole, meaning the pull on me isn't really that much stronger than Earth's pull initially - why can't I then escape...

Hello dear physicists, Have you ever published some scientific paper works ? I'm a little confused about that publishment thing.Can I publish my works for exaple to Annalen der Physik and what are the norms for the publishment ? Can I send any of my works to any physics journal ? Thank you...

Hello there. Recently I was tasked to design a lab experiment using a ballistic pendulum. Now I understand that all the sources of the internet say that by principle of conservation of linear momentum, (1/2)(m+M)V2 = (m+M)gh , or V2 = 2gh And then using principle of conservation of energy, we...

Homework Statement we are asked to find the tension between the R6 = 20 ohms resistor, using thevenin[/B] Homework Equations the given solution for Ethev is 27.78 The Attempt at a Solution is seen in the pictures below thank i really appreciate your help as it gets frustrating not to know...

I'm currently writing a paper for a small class called "Contemporary Physics" and I am writing about particle accelerators and the search for the Higgs Boson. I have a fairly good idea about how the Large Hadron Collider works, but I cannot use my own explanation alone as I need references to...

if you have a reference for someone with a semester of thermo (as opposed to a grad student with 3 semesters), a link would be appreciated . meanwhile, a quick question: temperature, as determined by one of its factors for gases, translational kinetic energy, follows a Planck distribution. but...

The fundamental question, what is the reference geometry where images can be fused to form a 3D panorama? In other words, how images are assigned a 3D position? Does it require a gyroscope to be built in camera to define its position per image of the interest? Or just it simply fuses images with...

I need to know how a pair spectrometer works but I can't find a book that explains it in detail. They say that it has three crystals located in a line and the beam is collimated on the central crystal and somehow this signal is only analyzed when there are simultaneous signals from the other two...

So I understand that a battery consists of an anode, cathode, and electrolyte. Question: What is the function of the electrolyte? Can we use a conductor instead of an electrolyte like some kind of metal? If so, why don't we? Now for a penny and nickel battery stacked on top of each other you...

Well I was watching this documentary.there was reference to laser telescope.it use laser to get images of universe.I know the basic principle.it shoots out laser is space and get images from reflected light.but is that lasers really powerful enough to get images of objects which are far in the...

Ello, does anyone here understand how a standard overhead fan and air flow works? If so, what would happen if you're just chilling in your room with the door closed,windows shut and fan off, then the fan just speeds up to around90% thespeed of light for a second. Would that kill me, suck me...

This problem has charge that is not uniform in the inside, but it is still possible to find the electric field as a function of distance outside the slab using Gauss's law. How is this possible if the electric field is not uniform in the slab and plane? Wouldn't the electric field from the...

Homework Statement My teacher introduced the third dimension (## R^3 ##) and higher dimensions to my class using vectors. Later on, my teacher introduced functions of two or more variables and now there's no mention of vectors. I am confused as to how vectors (i + j + k) and functions of two...

Hi, let ## r_1,..,r_n## be residuals in a given regression. I am trying to understand how the test for normality works. This is how I think it works: We take the sampling mean , i.e., ##r:=\frac {1}{n} \Sigma r_i / n## , and the sampling standard deviation ##\sigma_{r_i} ##. Then, if the...

I read the Wiki page, then read Nikola Bregović's paper which Wiki mentions was selected as the best idea of about 22,000 paper submissions called by the Royal Society of Chemistry in 2012... I'm not seeing any solutions that indicate they take into account how a freezer works... a freezer...

If I'm right, all electronic component works on quantum probability. I was thinking all these electronic component works on classical physics only. Because probability will not produce 100% result, as and when desired. Thank you.

Hi. Could anybody tell me how does a purse hook works? At first, I tried to ask myself why the hook will topple if we apply downward force at the end of the rod labelled "opening" (I know opening means different in the figure). I'd say that the base of rotating head (bottom-right corner)...

I am learning classes and objects, and I don't get how ".this" works in Java. I don't know what it is used for and how to use it. My book that I am learning from doesn't do a good job of explaining how ".this" works. The book is: Java The Complete Reference 9th Edition.

I am a trucker. I drive a Freightliner Cascadia semi-truck. My cell phone charger will charge my cellphone with the engine turned off on my semi-truck. But the same charger will not charge up my cellphone in my car when my car's engine is turned off. Why will my charger charge up a...

i don't understand if light cannot bend, then how magnify glass works? how it is bending & magnifying the light?

http://www.newstatesman.com/science/2013/08/we-still-don%E2%80%99t-really-know-how-bicycles-work This is really kinda embarassing. Forget quantum mechanics our top scientists can't even figure out how a bicycle works. Is this true? I always figured it wasnt so much the gyroscopic effect of the...

I am a senior in high school researching sonoluminesce. Me and my teacher were hypothesizing the mechanism that could cause it and discussed the possibility of the bubble and water system having LED-type qualities, as an LED is light emitted by electrons falling into holes when excited by...

Homework Statement A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m-tall building. The bucket is initially at rest, but is traveling at 4.0 m/s when it reaches the top of the building. What is the minimum amount of work that the worker did in lifting the...

What kind of engineering works need one company that develop very accuracy arm robots except develop engineer in mechanics or develop engineer in control and what these engineers do in these job? What are the knowledge, experiences, requirement that are desirable to have for purchasing...

So far the explanation on BJT working principle always explained in electron flow perspective. I felt it's hard to relate with conventional current direction notation when the explanation explained in electron flow direction notation. For example in NPN transistor, the C-E current flow made me...

Is there any limitation for an NPP to work in 75% of power for a while eg. 3 or 4 months? If so should be any changes in calculations documents?

Homework Statement When it comes to charging a capacitor I'm under the impression that when a parallel plate capacitor is hooked up to a battery, that electrons simply flow from the negative terminal to the plate that is connected to the negative terminal, causing that plate to become the...

[SIZE="2"]Unfortunately I did not find suitable section to post this topic, if there is suitable one you may move it there. It is shown in the science documentary film “Through the Wormhole” (Season 2, episode 5 called "Is There a Sixth Sense?") how the consciousness acts on the Random...

I'm working on a project in which I have to build a tiny 4 cm long heater. I did this with copper-windings stuffed in a tiny steel rod. Now I know the power input into this heater is 0.368W, at constant voltage 1.5 volts and the resistance of the heating element is 6.1ohms for a time of...

NASA confirms ‘impossible’ thruster actually works, could revolutionize space travel http://www.digitaltrends.com/cool-tech/nasa-confirms-impossible-space-drive-actually-works-revolutionize-space-travel/#!btQgmZ Is there any explanation for why this produces a thrust? Does it have to...

Hi everyone, I would like to know how the BLE functions in more detailed manner. Consider the case of BLE beacons at the local retail outlet. I am notified of a offer when passing through the outlet. The offer may be a text based or a image based. I presume the merchant sends me a generic...

This must have been asked before. But never mind here I ask it again to convince myself. Newton's Second law says \vec{F} = m\vec{a} Now if we put \vec{F} = 0 here we get \vec{a} = 0 which is Newton's First law. So why do we need to state First law as a separate law? Before I asked this I did...

Hi, I didn't know if this is a homework question it didn't fit any of the template layout. If it is let me know and I'll post it there but I have some question that have become very frustrating and more frustrating in finding answers to them. If you are able to answer this question you just...

Citation: http://www.igenericdrugs.com/?s=Ampiox So, the Ampiox suppress the synthesis of peptidoglycane that are absolutely necessary for cell walls, also it inhibits the enzyme called transpeptidase that “cross-links peptidoglycan chains to form rigid cell walls”...

Hello, I'm new to these forums and they seemed like an excellent way to have my questions answered. I'll start by saying that I've never had any course that dealt with fluid mechanics (mechanical engineering freshman), so I'm having quite some trouble grasping how readings on an air flow...

So if I slowly pull the A string first B string will tear apart... Cause the A string will expand and it will pull the mass and B string... So B string will reach its breaking weight before A... Cause B has an additional weight mg working on it.. But if I suddenly pull the A string,it will...

Hello, I have a triangle wave generator working nicely with video op amps but I am trying to substitute much slower op amps. I am required to get it to oscillate at 30 kHz. I performed calculations and got it to about 29.8kHz you can see it attached for the AD829's I tried substituting 741...

I recently started working in low voltage electrical repair/upgrades in automobiles. I have a couple interns that i am working with and i truly want to be dam* sure I am explaining things properly to them. Me and my boss have had heated discussions on the subject and i believe him to be...

from what i see, only the vinyl disc is giving energy to the Gramophone; so how does it has a gain in amplitude? does the shape has anything to do with it, because i notice the same thing with shells

A nice article for laymen: http://www.michaelnielsen.org/ddi/how-the-bitcoin-protocol-actually-works/ Original paper: http://bitcoin.org/bitcoin.pdf One thing you will notice from reading the article is how terrible this protocol is for the environment!

All I have read in the electricity class is that AC is any type of current which actually reverses its directions periodically. I have also read all sorts of mathematical expressions concerning sine-wave form of AC. I have also understood how AC generator works. These topics had never bothered...

Check out TempleOS: http://www.templeos.org/TempleOSV0107.html It's incredibly impressive work. He wrote his own operating system. It's unfortunate he's totally insane (schizophrenic).

Did a quick search and didn't see this one. A friend recommended this product to me because she was concerned that I wasn't getting enough fruits and vegetables. When I asked a few questions (how it worked, what the ingredients were, etc.) she became defensive and basically said I was being a...

Dear Sirs, I am wondering what is the difference between v=s/t & dv = ds/dt where v-velocity,s-displacement,t-time. Consider Gallelio's equations-> v=u+at--(equation-1) & s=ut+1/2at^2--(equation-2) where u-initial velocity & a-acceleration My doubt is on following point; If we...

Homework Statement The integral of 5/(x^2 + 1) dx from -1 to 1. (The TheIntegral.jpg attachment shows this in a aesthetically-pleasing way.) Homework Equations sin^2 (θ) + cos^2 (θ) = 1 1 + tan^2 (θ) = sec^2 (θ) cot^2 (θ) + 1 = csc^2 (θ) x = tan(θ) x = cot(θ) The Attempt at a...

What type of physicist works in the field of Classical Mechanics? And yes, this does encompass the general theory of relativity.

This is taken from Peter J. Eccles, Introduction to Mathematical Reasoning, page 17. This is not a homework because it is an example in the text. Prove that 101 is an odd number. The text has given a way of proving it and I just want to do it with my own approach. Prove that 101 is an odd...

After studying more complicated electronics, I find myself asking this question - 'Why capacitor works?' Why does charge get accumulated on the plates? Isn't that a higher energy state than battery?

Is there any good pictorial representations of how torque, or a pulley, actually makes it easier to do work (less force required). I always hear that it spreads the work over a larger distance, hence why torque= distance*force, but that explanation just reiterates the mathematical equation. So...

i first formally learned about the cell in my chemistry class. their explanations for how it works was very unsatisfactory for me; so i wondered if this was rather a physics question. i have two half cells connected by a conductor (between the plates) and a salt bridge. i ask people why is...