Thread Definition and 573 Threads

Hi, I am trying to understand this Bell's Spaceship Paradox , which is basically asking when there is a thread connected between two spaceship (A,B) and an observer C observes a "constant" acceleration, then whether this thread will break or not by Lorentz Contraction. I think the problem...

This thread got me looking at Neutrinos for the very first time. They are the most recently discovered fundermental particles, the Tau Neutrino was first observed only 11 years ago in 2000. The neutrino was first postulated in 1930 by Wolfgang Pauli to preserve the conservation of energy...

Homework Statement Charge 1 (0.15 kg) in the following diagram is hanging from a light insulating thread, as shown in diagram (red is what I have added myself) Charge 2 is brought close and pulls charge 1 , deflecting the string away from the vertical axis by 40 degrees. The charges have the...

Another treadmill thread: am I more correct than a physics professor? I'm a freshman in college; I took AP Physics C: Mechanics last year in high school. Today my roommate and I got in an argument over whether or not it is easier to run on a treadmill than on flat ground. My friend argues that...

A newcomer named Mathbrain posed some questions/comments that need response, but posted in the balloon model sticky thread where discussion would likely be off-topic. I don't want to overload the balloon model thread with a possibly lengthy discussion so I'm starting a special thread for...

College Stress Help Alright I'm just going to get right to it. Right now I'm a freshman at BU studying physics, though I'm hoping to double major in math. And it has not been going very well. About a month ago I bombed my first set of midterms, but honestly I think I can attribute that to...

But couldn't find one. I just wanted to say hello and I really enjoy what I am reading so far. I have been running through tons of pages on a lot of these subjects on the internet and was hoping to find something with more conversations and am glad I have found it in this forum. Lots of...

I realize this is not about photo's but video's. If mentors decide this should go in the GD forum then please move it. I thought it close enough. A start: http://www.youtube.com/watch?v=k0DWfgVxMX4&feature=mfu_in_order&list=UL"...

Hey guys, I recently started a thread that linked to a website challenging the interpretation of the null resutl of the MMX, as well as Relativity; the thread was subsequently deleted. The purpose of this thread isn't to find out why, as I was made aware of the reason; instead I am just...

For anyone that doesn't know: silver is well known to have antibiotic and antifungal properties and many people claim it also has antiviral properties in vivo. Before the invention of beta lactam and other organic antibiotics, colloidal silver was the only antibiotic a doctor had at his...

Hello? Has somebody used or has experience about using Mathematica's code with multi threading for increasing it's capacity and efficiency or smth like this? My personal computer hasn't enough capacity to calculate all i need so now I'm looking for using Math on cluster. Thanks!

Everybody on the internet talks about inductors when they are in steady state. But nobody talks about inductor, when its in initial phase. Here is what I am talking about: We made a clear statement why voltage leads the current in inductor. And I understood that part quite well. But...

Does a left hand thread offer any advantages over a right hand thread?

So I was, in my pure innocense, googling for math word problems. Little did I know I'd only find word problems for kindergarten. Anyone got a good site for intermediate (17-21) word problems? Or just math problems in general? :D

Response to Deleted Thread that I've Worked on Too Hard to Let Go! This is one of my responses to the "Cold Air" thread under the "Earth" category. The thread was deleted, but there was one really excellent response, to which I counter-responded, except that the thread was deleted before I...

Hi, I am looking to adapt a car intake manifold. There are 4 injector holes (untapped) that measure a touch over 18.5mm. I plan to tap these holes and fit some reducing nipples to them. I have a 7/8" BSW tap bit and some M20x2.5 ISO tap bits. I need some help on the following; Will the...

This thread has no arguments and arguments are unwanted here. Thus, there is no disagreement. There is no agreement. There is no confusion. Therefore, this thread is the best thread ever.

Question : A balloon tied to a thread whose other end is fixed to the bottom of a beaker is held such that the string is horizontal. The path traced by the balloon if it is released is ? Answer : The path is along the arc of a circle Please explain why the path will be along the arc of a...

Why rainbow formed ?

I'm trying to determine the contact surface area of a threaded bolt so that I can make some changes to the design and maintain the same contact surface so as not to affect the performace in other ways. This presents itself as a helix, and my initial guess was that it may be best to work this...

Found this "not so little" beast flying round my garden shed today. A lower pitched "buzz" than a typical bee - it sounded a bit like a very small motorbike engine! I presume it's some sort of beetle. The wingspan was at least 2 inches. The first picture is after it crashed into the window -...

Hi, I am trying to figure out how to pass arguments to a thread via a struct. It's not really working out for me. What am i doing wrong here? #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <string.h> void *run(void *thread_arg); struct thread_args {...

Hi everyone, this is my first post on the forums :redface: OK so I want to design a microwave power transmitter and I need a few opinions before I make any commitments. I haven't made many complex circuits before, but I am going to do my homework if this is viable and break it into chunks...

Homework Statement I'm sitting down and doing somewhere around 50 problems this evening for practice, and I just got stuck. I will probably use this one thread to post multiple questions if that is okay. Homework Equations The Attempt at a Solution Edited out this problem, it was my...

EE vs. Applied Physics (different than "become an engineer thread" I think) Hello all, I read through the first few pages of the "So U want to Engineer" thread, but the gist was not quite was I was hoping. Ok, I am about to be a senior in an Applied Physics program in North Carolina. I...

Stoichiometry problem Homework Statement 1 g of H2O2 solution containing x % of H2O2 by weight required x ml of KMnO4 for complete oxidation in acid medium. What is the normality of KMnO4 solution? Homework Equations H2O2 + KMnO4 => 2KOH + 2MnO2 + 2O2 The Attempt at a Solution...

<Crackpot link deleted> Anyone have details or an opinion rooted in science?

Ok double slit experiment. Two slits send through one photon which passes through both slits due to wave/particle duality. So really we have two probablity waveforms now don't we? One passing through each slit and creating a wave pattern from the start of each slit. THat's how we get an...

Hi Folks Regarding the double slit problem, I read recently a theory that suggested that the universe itself split creating effectively two particles, which can interfere. Personally I think this is imaginative but it simply doesn't sit right, it seems somehow illogical and wasteful for...

From a locked thread: 1)When the car goes forward we tend to go backward and our back is pressed into the sit, so I'd say the balloon does the same, i.e. goes backward. It would be counter intuitive if it went the other way. 2)I have to use common sense here, pure intuition would leave me...

Maybe there should be a resources thread/sticky here? This would make a good start: http://cew.georgetown.edu/whatsitworth/

Fukushima thread, June 1st, 2235.

Hi all. Sorry for the out-of-place post, but I don't know who the right moderator is. There is a gentleman who has posted a mechanical engineering question in the EE section, and it should probably be moved. I feel bad for the guy cause he's patiently waited 3 days with no responses, but no...

My physics teacher is having us research random topics in advanced physics for us to get some experience with research. He assigned me Fluid Thread Viscosity, but I could not find any good sources on the web. Do you guys know of any good sites I could find some information on the topic? Thanks

Homework Statement A parent takes their child to a water slide which is shaped similar to a portion of a parabola (see diagram). There is an elevator 3m from the edge of the pool. The elevator takes the rider to the top of the slide which is 19m above ground. The rider slides down and falls...

Hello everyone, Is anyone else here planning on applying to grad schools soon? If so, please holler out! Maybe we can share resources with each other (in a place where there aren't many resources). I'm actually really into astronomy, but my area, modelling planetary atmospheres, is one...

I don't want to keep making threads when I come across some puzzling algebra concepts or problems, so I'll just use this thread as a reference point in the future when this may happen. I'm having trouble understanding the following: 1/x3 = -1 The author of my text says to cross multiply and...

Hi people new to this forum but i need some help on my thread design. I've been browsing the net for some time to try and find some help on the design of this but have not found much. My problem is i have a tubular member of 250mm outer and 100mm inner diameters that is subjected to an axial...

:zzz::zzz::zzz:

nvmd. This thread can be locked

Hi, I have a maglite pen powered by 2 AA battery. I hadn't used it for years. I found out i was leaking chemical already at the rear, and I couldn't open the rear cap. I tried using wrench, pliers, hammers, nails which I insert to the hole at the rear cap and no matter how I twist and turn...

I decided we needed a thread just to track radioactive contamination. I will start it with my hometown of San Diego, but reports from anywhere are appreaciated, especially if they show the degree of contamination of the Japanese countryside and the ocean. In San Diego we have seen only a very...

Discuss your latest adventures in fast food. Me? Last night I had FOUR sandwhiches in one sitting from McDonalds. It was awesome.

Your "Dream Come True" thread Now, to be perfectly straight with you all: I honestly don't consider myself very materialistic (or at least, I didn't used to be). As a matter of fact, I seriously thought for a long time about joining the church--maybe the Franciscans (pun not intended)--and...

I made the mistake of actually graduating. I had a low GPA at the time but was planning to go overseas anyways and didn't realize just how much such a low GPA would affect me. I now have a BS in Physics with a GPA of 2.9 in a no-name state university. What are my options? My goal hasn't...

dears y every time i post a thread i do not find it in the website? Did the administrator delete it? and y?

Yesterday there was a thread here on a claimed violation of Lorentz invariance, but I can't locate it today. Was the thread moved? Can someone point me to its new location? (I don't remember the exact title of the thread, but the posts referred to a letter in the Sep 2010 issue of European...

I've read most of the Paradox within a Paradox thread but rather than hijack it to get to my point I thought I'd start a new thread. First, if this has already been addressed from this angle my apologies, but it is next to impossible to read through all the TP threads to try and find one from...

A quick note: when learning anything, I wish very strongly to focus on things that have cross-applications. I have little interest in focusing on learning specific skills, so when I state an interest in programming or closely related subjects, I mean that I wish to learn the metaskills...

1. What does an experimental physicist do? What does a theoretical physicist do? 2. What does it take to be an experimentalist? What does it take to be a theorist? (In terms of ability, courses taken, skills, etc.) 3. Work conditions, career options, financial freedom, intellectual freedom...