Years Definition and 634 Threads

Well today I was reading much about the subject of light and photons.And we agree that photons are massless and taht is the reason they travel at c. But if something travels at c then it means it has no time as is said and if that thing traveling at c has no time then it means for a observer...

About three years ago or so, I came to this site complaining that for the life of me, I couldn't pass calculus 1. I just couldn't grasp it. I thought I was bad at math, couldn't do it, and was destined for something far less. Fast forward to now and I am about to graduate with a double major in...

This is wonderful news. There has been an upward trend over the past months and looks very good for Obama. http://www.huffingtonpost.com/2012/10/05/jobs-report-unemployment-rate_n_1942067.html

Hi, I have just a few basic questions. I was in the army for about 6 years then worked as a CCNA for about 6 years before being layed off, entire company was farmed out to Philippians I believe. I am a disabled vet with a wife and 2 year old. I was accepted into the VA's chapter 31 program...

It's been two years as of two days ago that I joined you all here on PF. In that time I have gone through several life changes, including leaving the active duty air force and moving to Arizona. I don't think I can describe the impact this forum and all you wonderful people have had on me in a...

I am just having trouble with percentages. Lets say a town has a population of 1,000,000 in 2006 1,200,000 in 2007 1,800,000 in 2008 The percentage increase from 2006-2007 is 20% 2007-2008 is 50% So, what I want to work out is the AVERAGE percentage per year. The increase...

I've given this a lot of thought the last couple days. I look at the Hubble equation v=H_0 d, and I don't see how this necessitates everything existing in a single point at some time in the past. Certainly, everything was really close together 13.7 billion years ago, but not in an infinitely...

Question. I'm 37 years old, former US Marine (13 years), I've been living in rural Japan for the past 5 years with my Japanese wife and two sons. I'm currently an English teacher in a Japanese Jr. High. I have taken only a few basic college courses on military installations. I love...

A 70 minute video overview of the NRC 2012 Decadal Strategy for Solar/Space physics is presented. Two years in the making, basic physics and societal impact as well as budgetary issues are touched upon. Access to detailed reports. Emphasis on the sun driving a connected system...

It's been bugging me. We've looked 13.5 billion years into the past, supposedly only about 500 million years short of the big bang, at objects 46.5 billion light years away. What were the limiting factors? What stops us so close from the finish line from peeking into the very beginning? If it's...

If something is supposedly 1 billion light years away from us, how are we able to calculate this..? Wouldn't we have to send a light out and/or x/-ray out to that point and have it bounce back, calculating the time it takes to bounce back to us..? If so, it will take 1 billion years to get there...

I enrolled at the University of Wisconsin-Eau Claire with the intent of finishing their dual degree program with UW-Madison for physics and nuclear engineering (http://www.uwec.edu/admissions/facts/dualdegree.htm). Heading into my sophomore year, it has become apparent that such a program may...

I am an undergraduate student in mathematics and physics starting on my third and final year in the Netherlands. The system here appears to be quite different from the US system from what I read on other pages. Basically, my impression is that we have to (or choose to) do more courses in a...

It takes a lot to shock me when it comes to creeping authoritarianism in America, but this takes the cake. Ademo Freeman is an activist for Copwatch.org, a police watchdog group, as well as a member of the Free State Project. What the story essentially boils down to: Ademo (a blogger and...

Homework Statement Given v0= 0 m/s, xo=0 m and t= 10s, use the equation below together to find Xf Homework Equations x=xo+vot+(1/2)at^2 vf^2=vo^2+2a(xf-xi) The Attempt at a Solution vf=at xf-1/2at^2 vf=2axf so then, plug in t=10 and vf=10a xf=50a ... I don't know...

Unbelievable difference: "...dated to 44,000 years ago, about twice as old as widely believed..."

So I am about to begin my third year of undergrad physics at a private school with a relatively unknown physics department. Because I came into college with a lot of AP credit, I am able to graduate at the end of this year with BS degrees in both physics and math. I have an excellent GPA and am...

A couple of people have told me this is a bad idea, but I don't see how. After I complete my first two years of undergraduate studies at my community college, I was planning to apply to all the schools I want to go to, and depending on which schools I get accepted into, I would take the...

If 40 grams of radioactive substance decomposes to 20 grams in 2 years, then to the nearest gram the amount left after 3 years is well i used the $N(t)=N_{0}e^{-kt}$ So $20=40e^{-k2}$ thus deriving k=.3466 Thus $N(3) = 40e^{-.3466(3)}$ resulting in: $N(3)= 14.1410$ or approx $14g$ just...

Distribution of mass across the universe is not even. Therefore, passage of time should vary according to gravity. Which means at places time will pass at a higher pace or a lower pace than in respect of other places. Then, how is the entire Universe exactly 13.7 billion years old?

What would be cool to have? What if we could shrink a peptide synthesis machine onto an implantable nanochip and wirelessly send it instructions to generate any sequence of peptides we wanted? If a pathogen mutates, maybe you could find something immunogenic on its surface, send the peptide...

I left school in the middle of transferring from my junior college to a four year to join the Marine Corps in 2007. I had acceptance letters to multiple schools (UCSC,UCI,UCSD,UCSB) but I opted to do combat tours in Iraq and Afghanistan instead. As of right now, I feel like I've really screwed...

https://lh5.ggpht.com/NsJ2tAGpQI0QP2_P31FfOXryx0O3em1mSGLvBjfZcdcGux20sksxwyPJNvLGlMSs7Aw6pmA=s167 The Pillars of Creation are 10 light years away from us, but are said to be already destroyed 6000 years ago. In the picture above, it say that we still have a millenneum to observe them. But...

This comes from Robert Zurin's the Case for Mars What is a Terrawatt year? Is that 1 terrawatt produced in one year? I don't see why it's measured in terrawatts. Why not just terrawatts? Further down he says That's more understandable. Tell me if this calculation is correct...

Hey I am currently in the 12th Standard and want to, become a neuroscientist as well as a writer, however until recently I was thinking about writing later in life(like in my 50s). But recently I have come across various people advising me of the low pay of a neuroscientist, and also with the...

Thanks, just curious ever since I watched Prometheus.

Yeah, it sounds impossible for me too, but I'm very committed to do it and I'm a hard worker. I need some guidance. Please be as kind as possible. the thing is that after working in an industry I choose when I was 16 without knowing myself very much I am ready for a career change...

Just wanted to get people's thoughts on which fields of EE will have the most innovations/breakthroughs in the next few years.

Sorry, An eight year old boy still breastfeeding? A 12 year old sleeping with their parents? While they're having sex? http://www.andersoncooper.com/2012/05/21/photos-inside-time-magazines-are-you-mom-enough-issue/...

Hi everyone, It's been years since I solved a physics problem for school. Now that I'm back at it I could use some help on this problem: Question "The astonomical unit (AU) is defined as the mean centre to centre distance from Earth to the Sun, namely 1.496 x 10^11 m. The parsec is...

So when I was about 14-22 years old, I was an avid skateboarder. It was something I was very passionate about. Something happened and I stopped doing it. I picked up bad habits that some young adults pick up and the things I once cared about fell by the wayside. I ditched those habits and went...

Why does inflation mean that the universe was much smaller at 380000 years after the big bang than we would predict from the Big Bang model alone? What would we expect the two sizes to be?

What's a good year to mark when the Internet Generation of Scientists will dominate sicentific activity? I define the Internet Generation to be a generation who has used the resources of the internet (such as physicsforums, of course) throughout all their scientific training, from elementary...

What a wonderful coincidence to find such an old star so close by! http://phys.org/news/2012-04-astronomers-billion-year-old-white-dwarf-stars.html Respectfully submitted, Steve

I'm working on a science fiction novel about a prosecutor in the future. He's assigned to different planets and they have an office system and he has a personal handheld device of some type. I need some help describing what this would be like in the future. I'm sure we're past...

Hi all, my college is jacobs university bremen, germany. and has 3 years bachelors. Does anyone know whether that program is accepted for doctorate in usa? Thank you.

So...I've been in the U.S. Air Force, active duty, for 10 years in July. I've started my separation process and am leaning towards getting out. My "plan" is to go reserve for the benefits and go to school full time, which they will help pay for, in addition to my GI bill. Here's my thinking on...

Traceless protein labeling http://www.nature.com/nchembio/journal/v5/n5/abs/nchembio.157.html http://www.nature.com/nchembio/journal/v5/n5/full/nchembio0509-275.html If this procedure really does work as they say, what a really, really slick idea this group has come up with. Not only...

Do you know the corresponding years of experience range for Intel pay grade level 7, 8 , 9

I've been a bad student my entire life, and I'm 22 now. My goal right now is to become an electrical engineer. Problem is that I do just enough to pass. My GPA is at about a 3.0 and classes are getting harder. I'm almost done with my lower division and I know my GPA is going to drop more...

And what has been the greatest discovery in the last 50 years? QED? For 100 years, it's clearly general relativity.

This is amazing. I want one. I'm interested in exactly what they did. http://news.yahoo.com/flowering-plant-revived-30-000-years-russian-permafrost-200137925--abc-news.html

http://en.wikipedia.org/wiki/Timeline_of_the_far_future

Does Boric Acid Expire ? or become B2O3 after 5-10 years on its own? Hi, I have had some Boric acid (99.9%) bought a very long time ago... The expiry date was in 2006... I have used it recently and it is as if it's pure B2O3. Is that even possible??! How could it be?! or is there something I...

Gents, My questions may seem trivial but the answers I found in the internet are contradictory,so I decided to ask them here since this forum is a trustworthy source for me. First,I want to say that personally I'm interested in Ph.D programs in Electriclal&Electroincs Engineering and...

I graduated high school one year late because I cut class like a fool. I went to a small public university in NYC thinking I was going to major in business or finance but as it turns out I was bored out of my mind. I took pre-calculus and was fascinated. I got hooked and never looked back. I...

I'm majoring in electrical engineering right now. My GPA is currently at around a 3.0-3.15. I lacked motivation all throughout my entire academic career. It's only been recent that I have been trying harder. I applied to many UC's already, but I know there isn't really much hope there since...

I use the planetarium program The Sky quite a bit. It's capable of showing the sky from -4700 years ago to 10000 years into the future. What's the methodology behind this? One giant leap, or small leaps of say 100 years to get there, with some last jump to the final date?

Hi I had done my Bachelors in Mechanical Engineering and had been working at a construction company through campus placement since last 3.5+ years. During this period, I had been trying hard to switch from construction industry but couldn't make it. I wanted to switch over to Design-CAD/CAM...

I'm getting ready to teach myself calculus with the ultimate goal of then trying to learn as much advanced physics I can in about a year's time. I've heard conflicting views about how hard this stuff is. One book said it takes two years of calculus before one can understand Schrodinger's...