Life Definition and 1000 Threads

Homework Statement Carbon 14 has a half-life of 5730 years, what fraction will have decayed in 2300 years? Homework Equations Nf/No =e^-kt The Attempt at a Solution Nf/No =e^-1.21 x 10^-4 x 2300 =0.068585374 However if I use Nf =No(1/2)^2300/5730 I get 0.757125224 I...

Quantum Man: Richard Feynman's life in science I registered, perhaps after it is over we could discuss in this thread. Rhody...

Hi, My Physics textbook talks about a nucleus disintegrating. What does this mean? I understand that the nucleus will emit either an alpha, beta or gamma ray but surely the nucleus still remains after this? Does the term disintegrate just mean than the nucleus has got smaller and become a...

Homework Statement The question asks: "What is the half-life of a He-6 nucleus with total(kinetic+rest) energy E=40 GeV?" How can we approach this problem? Homework Equations E=mc2 ; The Attempt at a Solution I thought of getting the mass of the He-6 using M=E/c2...

So I'm a 4th year biology major. I absolutely hate what I have been/am learning but that's another story. Ideally, I'd like to get into the field of math and get a master's/PhD degree but I've only taken up to CalcII - and that was about 3 and a half years ago. I did, however, love the math...

Constant state of Gossip, and the qualification for "life" In my Physics class (I'm a junior in high school), my teacher was showing how you can go online and download worksheets to do on your own time, and he even said along with my classmates that "you'd really only do this if you had no...

Hey, I enjoy to do physics, math and work with computers, but all the jobs I know of that consist of these subjects do not interest me. Maybe there's something I'm missing or something? A job like theoretical physics would interest me, but how does someone make a living doing something like...

I'm a transfer student in 2nd semester Ochem. I'm actually intending to study computer science, but I love all areas of science and I'd like to work in a scientific capacity someday (rather than just crunching code in silicon valley). My question is this: I got an A in the first semester...

Homework Statement In my Chemistry lab, we made silver using copper and silver nitrate. We put a solution of silver nitrate, distilled water, and copper wire in a test tube and observed it. Then we took the copper out (the solution turned blue and the copper had crystals formed on it but we...

Identify one (1) lesson on circles that could integrate the Seed of Life in the delivery of the lesson. I need help on this urgently

If light from long dead stars is only just reaching us, does this mean that if I shine a Lazer pointer into space, the light beam will continue long after I have turned of the power .. If this is true would a light beam continue to travel indefinably ?

After 1-2 years of writing formal math proofs in undergraduate school, I now speak and write much more eloquently than I used to. Now, before uttering or writing a statement, I take a quick pause to ask myself whether it's logically valid; it's unambiguous; it's relevant and sequentially...

"Life on Earth, forever?" Well obviously NOT, that looks more like a fairytale. When is the time when 1000 humans have left and have/not returned to the surface, according to the current trend? And, if we consider development, and emerging of new Space-countries, what will be the answer...

Are there any papers describing the possibility of life on Ganymede? I understand it is believed to have a liquid water ocean. But few seem as excited about Ganymede as they are about Europa. Is this becuase of the location of the ocean? If there are few or no prospects for lilfe on Ganymede...

I choose this site because it displays the pictures, but the article is hitting all the news sites: http://yourtubenews.ning.com/forum/topics/life-spotted-on-venus-russian-scientist Considering extreme life does exist on Earth is it possible that it does exist on Venus. After all the thick...

When i get some money that i wanted a want more. When i get some respect that i wanted a want more. It seems same thing is with power. Every time i want more and more and it never stops, where is the limit? And what is a real meaning of life? I'm sure it is not about running to delight all my life.

When i get some money that i wanted a want more. When i get some respect that i wanted a want more. It seems same thing is with power. Every time i want more and more and it never stops, where is the limit? And what is a real meaning of life? I'm sure it is not about running to delight all my life.

I read this very interesting article on physorg about how planetary tilt is essential to life and various things that can diminish axial tilt over time or not give rise to one; things that would make life less probable. But I came across this quote that I couldn't help but question the accuracy...

There has been some discussion about whether the methane lakes on Titan could harbor life. What I haven't seen discussed is the potential for life in Earth's methane lakes. There are many underground reservoir's on Earth that contain light hydrocarbons such as methane. If I'm not mistaken...

Hello everyone, First to preface I am not a scientist and have the heart of one (I purchased the heart from eBay... jk). Anyway I have a lingering question regarding Europa: Ok, I get the science about the tidal forces on Europa that flexes the rocky portion of Europa heating up the...

Does this actually happen in outer space? Do things actually move in uniform motion relative to each other? How would this work for the Earth considering it's rotating? Can the Earth ever be considered an inertial frame because it's always rotating?

I am getting my BS soon, I'm okay with going on to get my Masters if I want to do Medical Physics, but I'm not too keen on getting a PhD. I do not want a teaching job. Can anyone explain life after college to me if you want a job not in teaching or grad school? I'm pretty clueless.

It might just be finals getting to me, but what else can I do with a Bio degree besides med school and teach (which I don't really want to do)? I was thinking about it and it seems like a Chem or Biochem degree is way more valuable to industry? I'm sure (hoping) it's not true and I think I'm...

I have no idea where this topic belongs since it combines physics and biology. Is there a way to describe life, growth, and evolution in terms of Atoms or Physics. Or are they two completely different things?

Can you use any of these theories in daily life? Or how can you?

Hey everyone, I recently got a job tutoring a High School student in physics. I'm in fourth year at university. I've just had my first session, and I quite enjoyed it. Though I'm now very nervous about my student's upcoming test. I'd like to give some interesting physics related...

Homework Statement The radioactive nuclides released into the atmosphere by the Chernobyl nuclear accident in 1986 included both 131I (t 1/2= 8 days) and 137Cs (t 1/2= 30 years). Given that 5 times as many 137 Cs as 131 I are present in the reactor in steady state, and that 131 I is produced in...

My question is based around the subject of quantum processes. Is it possible that every living thing is a probable outcome of the original spark or energy. thus saying that every other living thing is a different version of myself. just a thought

If someone in a distant stars is watching for signals of life coming from other planets, how far did the signal of life in Earth travel yet, in a cosmological context?

I'm doing a research project which aims to develop a mathematical correlation for fatigue life prediction at resonance frequency. An experimental setup is also to be created which would be used to carry out the experiment, cyclic loading cycles until failure. For this a Cussons linear vibrator...

Homework Statement This is mostly a statics problem but I'm sure this forum can help me out. Mostly all in the picture. I am trying to find the force in the x direction at point B resulting from loads P1 and P2 at point A. Point A is at the center of the cross bar so therefore it is at equal...

I have been trying to maximize the life time of my laptop battery. My approach to that is to almost use up the charge in the battery then immediately charge it. It is always annoying when the battery have 5% left, because that's when it hibernates automatically. Can I change the settings so it...

my previous post about using nuclear power to travel near or at the speed of light was solely inspired by gleise581g. this system being relatively close at 20.5 LY away, which with current propulsion technology would take around 300,000 Earth years to travel there. although this extrasolar...

Hi, There have been many excellent posts recently about entropy in the universe ... some I've understood more that others. So, I have a fairly basic (I think) question: following the standard comosological model, has the (estimated) measure of entropy in the universe increased over it's life? To...

Hi All. Recently I came across pretty interesting description of life, which was positioned as ultimate truth, and the funniest thing is that concerning it's strictness and at the same time generality it looks like pretty probable candidate. I wonder what do you think about it, can it stand...

The possibility of life on other planets has been one of our oldest doubts... and oldest hopes. Many believe that we are the only ones here in an infinite and lonely universe, but, as put so eloquently by in the film Contact, based on the novel by Carl Sagan, "If it is just us, it seems like an...

Can you give me some "real life" examples of simultaneity? For instance I know the one about the train and the lighting strikes but I was under the impression that this only holds up if the train is moving close to the speed of light. Thanks.

Hey, so here's my story: I've always been incredibly interested in theoretical physics and math. I was never really exposed to it as much as other kids in my high school, though, and so we had some ridiculously good math students. I quit being competitive in math/physics ever since a bunch of...

I've been trying to do some research about it and all I get is either some comment saying we don't really know for sure or an enormous article stating all this parapsychology research that I can't go through in time. Can anyone just tell me what the science is saying for now concerning the...

Is it just that you create your own meaning or is it there is no meaning or a different options? Also if everything is predetermined does that change the meaning of life? I would assume it would make no difference to the answer.

Homework Statement I'm not sure if whether mass changes when atoms decay. Does emitting alpha/beta/gamma cause the atoms to lose mass? I don't know :confused:Homework Equations Uranium-235 has a half life of 7.35x10^5 years and uranium 238 has a half life of 4.5x10^6 years. Compare the two...

Hi all... I currently find myself within a position of which i hardly perceive to be enviable. Lost amidst the proverbial smoke of despair, instigated by an abrupt realization of life as an entity, and more specifically my relevance within it. I feel my predicament would best be aligned to...

Alot of people are trying to prove its real. I am a noob at quantum physics but I've been reading up a lot about it.I took physics in high school and did really well but this quantum consciousness idea is driving me crazy. Can someone tell me exactly why quantum consciousness isn't true...

Universe created with an explosion. ie, work directly propotional to energy. after the explosion of a universe get gravitised. ie, work directly propotional to force. there fore equation would be work=constant*energy*force Can there be a fixed value for this constant if yes what is it...

Oks, I've always been a passive reader of forum...Until now =) Im a ME student, finishing my 2nd year AND I am working 20hours/week at a well renown technology institue at my country. Working only 20hours per week gives enough time to study, so I am doing ok. Yesterday, another job was offered...

Hello everyone, I am in my fourth year of University and still have no idea what I want to do. I completed the first year of Engineering last year, but I did not get into Electrical because my average was just over the minimum required and all the people with better averages got in. I like...

It's been a long time from my childhood. I'm almost 40, so I thought I'd try to find some people from my past. In particular, two guys who had the most significance and bearing on who I would become. The first was a guy who was a friend of mine for a few years before we simply stopped hanging...

Life on Earth has existed for around 3 - 4 billion years and Earth itself has been around for about 4.5 billion years. I personally believe that there is intelligent life beyond our home planet, I think it is probably quite abundant given the numbers of stars and planets that are out there...

...or maybe not a definate "no", but a positive "much more rare than scientists predict". I have been pondering this question, and every scientist I hear speak on the matter does the famous "alien life equation". What they fail to do is factor in a few variables along with how many planets...

Is the universe similar to Conways game of life? Let me elaborate. For us, a second is the unit of time and its a pretty short unit of time. But then at the atomic scale, a second is a pretty big unit of time. Everything we do is in the order of seconds or maybe milliseconds. But so much happens...