Age Definition and 590 Threads

I'm talking about the World economy becoming so bad that it'll ultmately lead to revolts in every country and then the ensuing anarchy, which will bring down all the governments and authority.. reverting us back 300 years into another dark middle age. Before you answer, please give my...

Does anyone else believe that we are not going through global warming but actually and ice age?

There is a surprisingly strong amount of evidence to support this idea. http://www.cenpat.edu.ar/diversidad/PDFsRolo/12-Neves%20et%20al.%202004.pdf. I've just read an amazing book linked to this speculation, see attachments. The only given theory as to how they could have made it is by boat. I...

I think college is way tooo late to learn how to write mathematical proofs! Proof writing should begin at least either in elementary school or middle school. Proof writing is just as important to a students education as learning how to write sentences and learn how to combined those sentences to...

http://www.sciencedaily.com/releases/2009/02/090216092824.htm Quote. The Younger Dryas event, which began approximately 12,900 years ago, was a period of rapid cooling in the Northern Hemisphere, driven by large-scale reorganizations of patterns of atmospheric and oceanic circulation...

There is a lot of speculation about why the Earth has not entered into a new ice age, following on from the pattern of glacial cycles recorded in the polar ice cores. It is a possibility that the Earth's tilt towards the Sun actually increased in the recent past. I know this sounds slightly...

I was wondering if anyone knows of any jobs in new york state for a 15 year old boy? I am not look for yard work and baby sitting. I want real places. Also if you could give specific places like walmart not retail store. i need real places that you know hire 15 year olds.

1. Twins Abby and Billy separate. Abby travels at a uniform speed (except for the brief turn-around period) to a star 4.2 light years away and, upon returning, finds that she is 5.2 years younger than Bill. How fast was Abby traveling? By how much has Bill aged during the period Abby was...

Cells are constantly being replaced at a high rate, but why does our skin wrinkle nonetheless? When you workout or are involved in any physical activity, and you eat enough protein, muscle tissue is being built and repaired. Why do reflexes slow? It's still the same or nerve channels being...

Homework Statement How does the speed of light's finiteness limit the size of our observable universe? Using the speed of light (c = 3 x 10^8 m/s), estimate the age of the observable Universe in years given its estimated size of about 10^26 m. Homework Equations The Attempt at a...

I am attempting to solve a second order differential, but I am have never done anything like this. I was told that it was a good Idea to think about Fourier transforms. \frac{d^{2}q}{dx^{2}}=\frac{dq}{dt} Boundary Conditions: q(+/-\infty,t)=0 q(x,0)=S_{0}\delta(x) Apparently the final...

Multiple evidence suggest that the Pleistocene epoch (2.56 Million years - 11.6 thousand years) was about waxing and waning Ice sheets with the pace of the milankovitch wobbles superimposed on the Earth orbit. One intriguing element showing this is a multiple multi-millenium cycle in...

What real proof is there of the Big Bang? I have never heard anything that is convincing. And how do scientists determine the age of the universe, is it really calculated or is it just estimated?

At what age did Newton encounter and fell in loved with mathematics? I was really surprised when some sources said that he learned trigonometry during his college years and that he didn't really read Euclid's elements until after...

The age of the universe is 13.7 gyrs. The distance to the CMB is 13.7 giga parsecs, maybe I don't understand what a parsec is. Can someone explain?

Homework Statement Determine how old is a fossile where a 14C/12C ratio of 6.1 x 10^-13 is measured. 14C desintegration has a half-life of 5760 +- 40 years and proportion 14C/12C in living tissue is 1.17 x 10^-12. Determine the error in your calculation. Homework Equations Radioactive...

Is it possible to know BH age?

Well here goes. I have been looking at the posts in this forum and they have been stressing me out about my age. I am 27 and have finished an associates degree and am in my first year as a physics students at a state school. Depending on how the classes are offered I will finish my bachelors...

I did some research in regards to the age and metallicity of population I stars in hopes to come up with a novel solution to the Fermi Paradox. Anyways, while the metallicity of the oldest Population I stars can be tracked down to be something like -1 (10% of that of the sun) determining the age...

Hi, one of physician from Yale Univ explained first 6 days in bible can be very similar to 16 billion years if we understand relativity. His theory tells that first day after the big bang, temperture of the universe was around 3 trillion times higher which means frequency of universe...

A recommended lecture on the age and detailed structure of the Universe, listed in reference 1. George Smoot is a Nobel Prize in Physics laureate for his work on COBE.Primordial fluctuations simulation by Andrey Kravtsov: Reference...

Homework Statement Neglecting other elements of the cosmological model, the inverse of the Hubble constant, 1/H_0 , tells us the time since the Big Bang - the age of the universe. If H_0 = 70 km/sec/Mpc, then how old is the universe? Homework Equations Given above The Attempt at a...

arXiv:0809.3627 (cross-list from astro-ph) [ps, pdf, other] Title: Alleviation of Cosmic Age Problem In Interacting Dark Energy Model Authors: Shuang Wang, Yang Zhang Comments: 12 pages, 3 figures, 5 tables, to appear in PLB Journal-ref: Phys. Lett. B 669 (2008) 201 Subjects...

Should Kids Be Able to Graduate After 10th Grade? http://news.yahoo.com/s/time/20081107/us_time/shouldkidsbeabletograduateafter10thgrade By KATHLEEN KINGSBURY Kathleen Kingsbury – Fri Nov 7, 4:50 am ET Can most children be ready for junior college by Grade 10?! This does seem to shift the...

Homework Statement Write a program to determine the age of an object given the creation date and todays date. The program must contain 6 user input statements (asking for year, month and date of creation, and year,month, todays date) and display the age of the object in days. I have...

This is the best article i have read to date. http://www.sciencedaily.com/releases/2008/08/080815101317.htm The remarkable archaeological site, dating back 10,000 years and called Gobero after the Tuareg name for the area, was brimming with skeletons of humans and animals — including large...

http://news.nationalgeographic.com/news/2005/02/0217_050217_space.html How can we measure the cluster's age? Because astronomers are able to analyze light waves and thereby tell how long it took for the light, and the images the light creates, to reach Earth. The light that created the images...

or at 5 years later after you graduated college? Were most of you certain in what direction you wanted head to for the rest of your life? Were most of you fully matured by the end of your senior year in college (if a lot of you went to college that ) or were most of you unsure what you wanted...

I'm a junior in college and just transferred to my new school. whenever i meet new people, they all seem very surprised that I am a junior not a freshman. I'm getting really fed up with this! I've been thinking about lying to people from now on: tellign them that I'm actually a sophmore

I didn't know he had cancer. http://movies.yahoo.com/mv/news/ap/20080927/122253216000.html

I have a question regarding a probability question. If four people are randomly selected what is the probability that at least one is born on my birthday. This would make me think that I want to do the formula of 1 - (1/365)^4 which comes out to be 1 - .000000000005636405776 = .999999999...

I need help evaluating the age of a universe. Using a graphed representation of hubbles's law. The recession velocity is on the y axis, and the x-axis is in billions of light years. How can I approach this problem?

I'm curious about demographics here at the Physics Forum.

and at what age did you complete your undergrad and grad degrees and phD if you did it? I have a feeling that after one reaches thirty one cannot progress further... since most famous researchers were still young while making their greatest discoveries... anyways, my feelings aside... I...

, Like the mediums television and radio were deemed to have golden ages where the quality of tv shows and radio broadcasts were at their peaked? Now most critics say that these mediums have will never produced quality shows like they did during their golden era, and sadly tv and radio shows...

Test your brain's age here: http://flashfabrica.com/f_learning/brain/brain.html" Apparently, mine is 20...much older than most PF'er brains I am sure. I used the Google toolbar to translate the instructions:

i only would like to know, is it good for the father to have children at the age of 60 ? the mother is around 50-55

Homework Statement The technique known as potassium-argon dating is used to date old lava flows. The potassium isotope 40K has a 1.28 billion year half-life and is naturally present at very low levels. 40K decays by beta emission into 40Ar. Argon is a gas, and there is no argon in flowing lava...

Granpda and Grandma have 126 years togehter. How old is Grandma and how old is Grandpa, if Grandpa is twice older then Grandma was when Grandpa was as old as Grandma is now?

I'm reading the relativistic mechanics chapter, of Hestenes' New Foundations for Classical Mechanics. After the derivation of relativistic doppler shift is some general discussion of applications. The last of which (4) discusses Hubbles law: "distant galaxies are receding from the Earth with...

we have seen galaxies 13 billion lightyears away... this means that 13 billion years ago those galagies were 13 billion light years away.. however the light we see from them was emited about 700 million years after the big bang... so if we and those galaxies were at that same point(big bang) and...

Homework Statement The Age of the Earth is 4.5 × 109 y. Use the information given in the following table to calculate the ratio of the number of 238U nuclei at the present time to the number of 235U nuclei at the time of the formation of the Earth. Isotope Half-life...

In 1991, hikers found the frozen remains of a man in a glacier in the Alps, near the Austrian-Italian border. Carbon-14 analysis of tissue samples taken from the body revealed that the ratio of carbon-14 was 52.7% of what it was originally. Calculate the age of the body. A formula to...

I'm looking for some information regarding whether there is any evidence to support the widely held view that intellectual productivity peaks of an individual rises from their late teens, peaks in their 20s and starts to decline in their 30s. However, I'm not sure that search terms to use when...

http://www.reuters.com/article/blogBurst/science?type=scienceNews&w1=B7ovpm21IaD The Younger Dryas occurred at a time when orbital forcing should have continued to drive climate to the present warm state. The unexplained phenomenon has been the topic of much intense scientific debate, as well...

Me and my girlfriend have been having this ongoing debate, and I'd like to see what others think is the best age. When I say "best age" I mean the age where you are old enough to be financially stable and responsible, yet young enough that you're not quite over the hill. I say 28, she says...

Is it accurate to say: The Light-Year distance from Earth to the Surface of Last Scattering (= CMB location) EQUATES TO the Age of the Universe (13.73 Gyr)? (ignoring units conversion factors). Would an observer, say 13.0 G Light-yr from us, ALSO see the CMB the same distance away...

For instance, when a person graduates from college , do you think they've learned all they need to know and so they just apply the skills they acquired in college to society? Or do you think people just stop feeding there mind after they had kids? Of course, you need to learn parental skills...

I just wanted to start by stating that I have been a long time reader of these forums (this is my first post) and want to thank all of you out there for taking the time to share with the rest of us your knowledge and insight. I have fairly recently become interested in the topic of our...

consider two interacting photons in the EPR effect. the photons separate and move towards different detectors 1 km in each direction. measuring the first photon instantaneously affects the other photon. how much has teh first photon aged? how much has the second photon aged?