Life Definition and 1000 Threads

Just recently I decided to buy an ozone generator that can produce 4 grams of ozone / hour. However, I did a little research and found that ozone has a half life of 12.5 hours at 35 Celsius. For fun, I decided to find an equation that would let me know the amount of ozone left in the room...

I just wanted to tell my story and would like to see if anyone has been in the same predicament or is about to encounter what i have encountered. This might be a long story but i just want to get this out there and see what people have to say. It all started in high school in southern...

Hello, I have a gamma spectrum of one element (X). There are several gamma peak in the spectrum. For example, 800 keV peak, 1000 keV peak and 1200 keV. I have an information about the peak area changing with time. Namely, I know the peak area in different times. So I can calculate the...

What do you think happens to a person's mental processes when they die? We know the molecules that made up the body are converted into simpler molecules and recycled back into nature. How about something like the memories that were recorded in their brains (chemical and electrical...

Hi, Calculus is one of those elusive areas which a lot of people grapple with. Where do we use Calculus in real life? Please share your ideas for the same. Cheers Vishal

I am working on a wireless sensor application at my internship. The sensor network is working, and I am using two Xbee radios, one at the sensing end and the other at the receiving end which routes the information into a central MCU. The issue is, the sensing radio needs to be standalone and...

Hello everyone, i return to complete the final year of my degree in the next 12 months and go on to do further studies ie masters and phd depending on how long they will put up with me and all of my questions. I have had quite a long break, and have been continuing to study pure mathematics...

I'm 25. I can't speak english very well but i will try to explain my problem. When i started high school i met a very charismatic teacher that initiated me to philosophy. Before that time i didint' have any self-consciousness. I was spontaneous, stupid, but i was united to myself. And for the...

I'm skeptical about a some things in physics as some things are hard to understand, or I need to see proof to believe it. I find that for physics, it helps a lot to see a real life demonstration (video) of what's being explained. I understand the whole radioactive decay thing, but I have not...

I think this is the right forum to start this thread, if not i am sorry please somebody change it . suppose a planet is in the right distance from its star and it is rocky , has water and atmosphere but the only thing is it's not rotating itself , i mean it's always facing it's star , then...

Hey guys, I'm writing a story where Earth suffers a catastrophic event, destroying all surface and ocean life. The surface is basically bathed in intense radiation. To be more specific, Earth is attacked by aliens, and ships destroyed during the battle in orbit crash into the planet below...

I just read Schrödinger's "What is life?" and was very confused by some of the things he said in his epilogue, some help understanding it would be great! What does he mean by the "plurality hypothesis"? I think he means that idea that multiple consciousnesses could make up one consciousness...

I'm new to this forum, but I've been reading here a lot over the past several days. I'm planning on starting a sci-fi universe for a gaming group I'm in and for a book that I want to write. I've been doing a lot of research and I want the first planet I'm designing to exist in the Castor system...

I could not qualify for JEE Advanced. I completely lost my dream of studying physics at IIT. I am going to take admission in computer science at a crap college. My 12th marks are very low to study physics at local colleges too. So i had no other options but to opt for computer science. I always...

I am 17 year old student currently doing the first year of my IB diploma in Africa. in the entirety of my life all my subjects were one's that will orient me towards a future in a scientific field which I often argued with my father about. I am highly interested in mathematics and physics and am...

Is there any real life phenomenon that can be modeled by the curve: S(t) = 1/(1+e^-t) ? in the range between t=-5 and t=5 Thanks!

Hi, I saw this problem in my textbook. (Please see attached picture.) So, first of all, my answer to this question would be that since the activation energy is lower than the bond energies, it is very easy to provide enough energy for the process to occur. Most importantly, is my answer...

What does your typical week day look like? When do you wake up? When do you study? Do you do anything else regularly? Etc.

Quasi(Almost) Equilibrium(Static) Processes <---> Real Life Processes Hi, I am posting here for the first time, hence, should I have violated any forum rules I am sorry and kindly advise. I am a novice so please bear with me. Thank you. I read everywhere (in textbooks) that a...

I work at a company that manufactures TPU screen filters for the mining industry. I've got a test to do to inspect whether the qaulity of the TPU is affected by time in the heated barrel of the injection moulding machine. The TPU material sits in the barrel due to tea and lunch breaks (15 - 30...

Hi, I have some confusion about the cosmological constant (CC). From what I have read it is to do with the energy density throughout the entire universe which is thought to drive the expansion of the universe. If the CC were any smaller then matter would not have been able to form and since the...

Hello my EE brethren, I'm currently working on my Master's with thesis in E&M Engineering, with an emphasis on RF, and I'm absolutely depressed out of my mind. Despite my loving of everything about the science behind the subject and the fact that I'm doing extremely well, I feel that I have...

If I understand Logarithms correctly it is the orders of magnitude? Either exponentially growing or exponentially decaying. I've heard that exponential growth is the same as the growth of cancer cells. But what are some other real life applications/examples of logarithms? Thank You

For a physics project, we have to increase power to an automated wheelchair. This wheelchair has: Battery Capacity 2x60AH Battery Needed (x2) GR 24 I know that this means there are 2 batteries at 60 Ampere-hours. I don't know what a GR 24 is. Also, I don't know how to increase...

Hi all, for job reasons I have come across LCCA, and I have started documenting myself reading this ebook that I found googling: Fuller-Petersen, LCCA. Now, I'm new to the topic, and I have a few questions: 1) Is it just about calculating all the costs of two projects, maybe taking inflation...

I got a lithium battery pack for my ski glove. On high it last for 2 hour, 4 hours for medium but on low it only last 3 hours. Why does the battery not working long on high? Does the cold weather affect the batteries from operating at its peaks power. Would it be better if I use some type of...

So Thursday we had our first big test in class. I had managed to ace everything in the homework leading up to the test. I got cocky, and then I ended up bombing the test. I rushed through the test and completed it in about half the time I should have. The teacher offers a review with each...

A "new" thermodynamic theory of life Interesting idea... https://www.simonsfoundation.org/quanta/20140122-a-new-physics-theory-of-life/ The peer-reviewed paper, published in AIP: Journal of Chemical Physics: Statistical physics of self-replication...

Hi, I want to know what is the proper methods to prolong lithium battery life: When Should I recharge the battery(at any level 90%, 70 or 40 etc)? Should I charging it fully at 100%? is true that discharging battery below 20% once each month is useful to boost battery life?

When I had a school tour to A water park, there I observed that when a heavy boy used to slide down a water slide(and stop at β), he used to go further than where the ligher boy used to stop after sliding(α). But the friction will act more on Heavier then why is he going further?

Hello! I'm looking into getting an electrical engineering degree. I understand that there is a very wide variety of electrical engineers, located all over the world, but my questions are a little more specific. I noticed there's a demand for electrical engineers in Texas and surrounding...

Hey guys, I’m interested in knowing if there are any known implications of quantum theory in the macroscopic scale, regarding randomness. Small particles behave probabilistically, but that has any consequence in the macroscopic or in the microscopic (but higher scale than those particles –...

As the title says. I think as a young person, it's hard to acknowledge you have these. Time seems infinite, surely there will come a day when you will achieve that illusive goal! Someday! But I'm 50 now so I realize I have a few: Run a marathon. See the green flash. Walk the...

Hi all, I think this is a self help question, but I still need some advice. I am a Post Graduate Mechanical Engineer and started a job from past 6 months. Initially I enjoyed Engineering because I liked to be with passionate people and building some things. In addition I enjoyed learning...

Hey, I am a physics major who just found out he needs to stay another year before graduating. Have people done more than one REU?

Is it possible for life to exist on a planet with an atmosphere radically different from earth's? Where the organisms breathe gases other than oxygen or carbon dioxide?

Most biology textbooks state that life can be classified into three domains: bacteria, eukarotes, and archaea. This classification began from early studies looking at the evolutionary relationship between these three groups of organisms that concluded that all archaea are more similar to...

The recent discovery of a warm super-Jupiter [re: https://www.physicsforums.com/showthread.php?t=727440] raises tantalizing questions about the prospects of life being found on, or near, such a body. A quick perusal of the literature reveals [unsurprisingly] this possibility has been considered...

People are saying that Kepler 22b looks like it may harbour life. How could we ever know? I was just wandering, but what would the delta v be to do a Hoffmann transfer (if this works on an interstellar scale) to Kepler 22b?

How does an atoms "life" end? Two stupid questions. What "force" keeps the electrons spinning around the nucleus in an atom, and how does an atom eventually "die", or wear out? Thanks for a serious answer, I really have no idea. :frown:

Would it be possible for biological life to evolve a part of itself to be as hard as iron? I’m thinking of a tree analog. The wood or bark can replace metal for a low-tech society. The planet itself is deficient in metals because of its history, so I’m not thinking that the life form uses...

There are many obstacles for life forms to overcome and many states of evolution that would have to take place for many of those species. I am looking for specific problems that need to be overcome. Besides resources, I'm looking for more attributes which affect physical existence, such as...

How likely is it that Europa has life under its icy surface IF there is a liquid ocean. Would the ocean on Europa be similar to our oceans? Lastly could Europa have to hydrothermic vents in the oceans like our oceans do or does that require a molten mantle? Thanks for the input :) P.S...

Sorry for not using the question template, but I don't have any relevant information, like equations or solution attempts at this, since I literally have no idea where to start. Google has failed me. This isn't necessarily a homework problem, but it is for part of a project I am working on...

Is discovery science's "Unexplained files" more believable than say ,History channel's "Ancient aliens" ? http://science.discovery.com/.../red-rain-in-sri-lanka.htm http://en.wikipedia.org/wiki/Red_rain_in_Kerala Mod note: Inappropriate links removed[/color] They said the red rain 'cells'...

http://www.dailymail.co.uk/sciencetech/article-2503370/Quantum-physics-proves-IS-afterlife-claims-scientist.html Valid information,or can this article be dismissed as pseudoscience?

What would a typical day consist of for, say, a theoretical physicist at a University?

universe is "fine tuned" for life http://web.mit.edu/rog/www/papers/fine_tuning.pdf There is some evidence that the universe is "fine tuned" for life. If the fundamental constants of the universe were a little bit different then we couldn't exist. Roger White considers this evidence of a...

Homework Statement A car starts from rest.When it is at a distance s from its starting point,its speed is v and it acceleration is a = (25v + v^3). Show that dv = (25 + v^2)ds and find its speed when s = 0.01 2. The attempt at a solution a = v(dv/ds) = (25v + v^3) divide both sides by v...

I'm not going to give you guys the full story, but I will summarise. A fair few years ago, I got into some trouble, starting drinking far too much and basically went of the rails. I got kicked out of uni, ended up going to prison for a little bit, almost died after being stabbed and got into a...