Age Definition and 590 Threads

<< Mentor Note -- typo fixed below with strikethrough history shown >> I am in a heated debate with a client climate change denier (he created some of the software for their instruments, he says all evidence of how Earth's age is determined is flawed because the Earth's crust is continually...

It seem incredulous to me that the Milky Way was formed just 13.775 million years after the start of the universe. If this is correct was it in the form that it is today?

Please correct me understanding if it is wrong. I know that the oldest light we can observe is 13.8 billion light years away. However, we know that space undergoes inflation, and as a result, there is a maximum observable radius of light that could possibly be seen from any point, regardless...

The Wikipedia page on gravitational time dilation (https://en.wikipedia.org/wiki/Gravitational_time_dilation) states: "Relative to Earth's age in billions of years, Earth's core is effectively 2.5 years younger than its surface." A clock subjected to less acceleration (gravitational or...

I'm 31 years old & going to enter into 2nd year of BEng mech. Degree which has 3 years.I already have diploma in marine engineering & have sailed on ocen going ships for 1 year as junior engineer.Is the first is better? (1.Is 1 year experience on ships can relate to mechanical experience...

i got a bit lost in the responses to my last question so I am guessing this one is really going to be beyond me. Assumptions I have used for my questions are: · Speed of light = 299792.458 km/s · Hubble constant = 71 km/s/Mpc (I know about the tension of H0 being 68 and 73 but...

The ratio of Miss Chen's age to her father's age is 2:5. In 8 years' time, the ratio of their ages will become 1:2. How old is Miss Chen's father now? My work. Age of Chen = C Age of Father = F ----------------------------------------------------------------------------------------- Method 1...

It is said (hopefully no need to give references for such a common statement) that the electromagnetic field of a given charged particle is infinite in range (albeit converging to zero as the distance goes to infinity). However, given that charged particles apparently did not exist at the...

This is a gendenke experiment. You(A) and your friend (B) are on earth. Now your friend sits on a spaceship that can fly at speed of 0.1c. He flies for 5 year straight ahead(away from earth) and then returns back slowly. The answer that i get is B would have aged. Assuming this answer is right...

Homework Statement Today i am half as old as my brother was 7 years ago. I am 11 years younger than my brother. How old am i? 2. The attempt at a solution Let I = Me and B = Brother Let: Brother age = x Hence my age now = x -11 So, 7 years ago: my brother was (x - 7) and I was (x - 11 - 7)...

Shutdown and evacuation of Sunspot observatory: https://www.abqjournal.com/1219922/nm-solar-observatory-closed-authorities-mum.html Note the word "mystery" in the headline. The in charge people need a tune up on procedures for dealing with events like this. Especially when it comes to places...

John is x years old and his mother is 25 years older than he is. a) How old is John's mother? My answer: x + 25 = mother b) What is the sum of their ages now? my answer: x + mother = current age c) when john is 12 years old, how old is his mother? my answer: 12 + 25 = 37.

Homework Statement If a father is twice as old as his son. six years ago father was thrice as old as his son. Find the percentage. A.10 B.12 C.120 D.6 Homework EquationsThe Attempt at a Solution first i am trying to express the equation f=age of father s=age of son f=2s (father is twice as old...

Hi, I am from India. I will be getting my honors for Bachelor's degree for physics in a few days. I am 21. As members at this forum are from USA too, so I want to know if I take exams like GRE, IELTS, TOEFL and get admission in USA, just suppose. Then, in any way, would I be able to be the same...

Q: The sum of the present ages of Vatha and Chris is 36. In 4 years time, the sum of their ages will equal twice Vatha's present age. How old are they now?A: Vatha:22, Chris: 14 (from the back of the textbook, only I'm not sure how to get here)I'm a little stuck with this one. If you could...

Hello everyone. A little bit on me.. I am 37, live in nyc, and have one more semester to catch up with calculus and other prerequisites. After that I will be starting a BS in Physics. I have an associates degree in radiologic technology, but found it very difficult to find work in my field. I...

Enjoy my collection of physics&related html mini applications, it's free and not commercial (I did them for fun and for my kids at extra school lesson). The idea was "so you have this adress and discover by yourself what is that". Some are simply just external links to PHeT etc, some are unique...

I think dogs of all ages are cute, we have two 1yr old dogs and they are as cute as heck, what do you think of this study. https://www.sciencedaily.com/releases/2018/05/180515142523.htm

Can someone kindly review my solution to see if I did it correctly. This is an assignment question. Homework Statement If Darth Vader was 50 years old when he left his galaxy in 2007, how old would he be if he returned in 2025 if he had traveled at a rate of 2.8 × 108 m/s? Homework Equations...

Hey guys, does anyone have more or less current statistics for the average PhD graduation age in maths or physics? I wonder wether graduation at age 32 is still unproblematic, for jobs out of academia. Suppose I lost a few years for internships or stays abroad.

Ok, some background. I'm nearing age 30. I have a degree in applied mathematics and masters in statistics. I'm thinking about entering the artificial intelligence field( maybe computer vision) by getting a PhD in Computer Science. It's not like I'm starting from complete scratch as I have a...

A mother is 10 times as old as her son. In six years time she will be four times as old as her son. Find the present age of the mother. Here is the set up: Mother = 10x Son = x 10x + 6 = 4(x + 6) Correct?

Hi, I was wondering, how can I find out my bioage? or is there a way/scientific test/s I can take to find out my current biological age? I am 33 in years but I want to see if my biological age is younger, the same or if its older then 33.

This WIRED article talks about CareCoach for seniors with Alzhiemers: https://www.wired.com/story/digital-puppy-seniors-nursing-homes/

Does the new quasar http://news.bbc.co.uk/2/hi/science/nature/649059.stm indicate a challenge for models of quasars? Some of the ritz-type models do provide explanations for these, e.g., http://faculty.washington.edu/devasia/Physics/Devasia_cosmology.pdf It provides potential explanations to...

Hi How much companies that hires people with a degree care about their age? Considering that two person has bot no experience for the work, a company prefer to hire younger people, or they care more about the skills a person have? Thanks.

Apparently "old age" is not a scientifically recognized cause of death. The typical belief by scientists is that people die of diseases that occur in old age, never of old age itself. However some gerontology researchers have disputed such and say that people can indeed die of old age alone.

I am now 24 and graduating a business major. I want to go for a second bachelors degree in physics. I already took an undergraduate physics course in my current college. I will be 25 or 26 when i start a physics major. Is it too late?

do we know for a fact that the gravitational constant has always been the same since the dawn of the universe? I feel like gravitational forces should slowly be decreasing as the universe ages (meaning that assuming mass of Earth doesn't change, we should weigh a bit less in a billion years)...

(Mods, feel free to move this thread to a more appropriate place.) I've been learning (the basic) of investing and one question I have is about when to start - in particular, when to put money into a retirement account? If you've got debt (student loans) and minimal income (I work part-time...

Homework Statement Q1. Lindsay is twice as old as she was 10 years ago. Kimberly is half as old as she will be in 10 years. Find Lindsay’s age now? Find Kimberly’s age now? Q2. In 8 years Tiffany will be 3 times as old as she is now. The number of years until Tiffany will be 6 times as...

Homework Statement "In 2010, a 20-year-old astronaut leaves her twin on Earth and goes on a rocket to explore the galaxy. The rocket moves at 2.7 x 10^8 m/s during the voyage. It returns to Earth in the year 2040. Using relativity, calculate the age of the returning astronaut." Homework...

John’s father is 5 times older than John and John is twice as old as his sister Alice. In two years time, the sum of their ages will be 58. How old is John now? John's dad = 5(2x) John = 2x Alice = x 5(2x) + 2 + 2x + 2 + x + 2 = 58 10x + 3x + 6 = 58 13x + 6 = 58 Correct so far?

John is twice as old as his friend Peter. Peter is 5 years older than Alice. In 5 years, John will be three times as old as Alice. How old is Peter now? Set up: John = 2(x + 5) Peter = x + 5 Alice = x 2(x + 5 + 5) = 3(x + 5) Is this the correct equation?

Ten years from now, Bill Crowe will be three times older than he is today. What is his current age? Bill's age today = x. Bill in 10 years = x + 10. x + 10 = 3x Correct?

In 20 years, Kayleen will be four times older than she is today. What is her current age? Kayleen's current age is x. Kayleen in 20 years = x + 20. x + 20 = 4x This equation does not make sense.

I would like to find the 12 to 19 abortion rate per 10,000 women from the following table: This would be the merging of age groups "12-17" with "18-19" to some how get the 12-19 abortion rate. EDIT: "Distribution of abortion age" was translated from "Répartition des ges l'avortement" in...

I was wondering if we are only aware of the observable universe, and the actual universe could be infinite, what do we mean when we say the age of the universe is 14 billion years? Are we talking about the age of only the observable universe or the whole universe?

I just watched a presentation about the acceleration of the Universe by Perlmutter. At this moment in the video he points the correct line for the scale factor of the Universe. Aaaaand that lines starts around 15 billion years ago, not 14 billion. So I thought maybe the latest estimations of...

Since time and distance are relative, it would seem that the universe's age (and shape, too) depends on the measurer's frame of reference? Like while for us the universe is 14 billion years old, to an observer in a black hole it might be only a few seconds old (and small). What frame of...

I just recently read about how we got to know the true age of the Earth but I am a bit confused and curious about one thing. The mineral or rock is initially going to be a uranium right? If it is, isn't all of it going to decay at the same rate? I know that a radioactive reaction is spontaneous...

Since time is relative then what is the age of the universe (13.8 billion years) relative to?

Lets suppose for a stroy, that a time traveller arrive in a civilization that hasnt reached iron age yet. He isn't a well qualified engineer or doctor, but he becomes a king. How much he could help their development by simply telling : with really hot fire, you could produce iron, not just shape...

Lee has an older sister and a younger sister. Her older sister is one year more than twice Lee's age. Lee's younger sister is three years younger than she is. The sum of their three ages is 26. Find Lee's age? My equation set up is x + (2x + 1) + (2x + 1) - 3 = 26 This equation yields a...

Until what age does brain plasticity still manifest? If it's real.. how come those of us who are poor in math are still poor in math and our brain math circuit ain't developing?

Recently I was thinking about designing products in a modular fashion and I began wondering what is it that makes products age? For example, many people don't bother repairing an old laptop because they know that its more likely to experience more technical issues simply because of it's age...

I have marked this as high school level, although I am studying an undergraduate general relativity course, and just want to get some basics right. Whenever I look for a 'cheap and dirty' method of calculation for the age of the universe, with a Hubble constant not changing with time, I am met...

With the life of a proton exceeding 10 to the 34 years and the electron even greater why can't we assume the universe is eternal and the big bang a fluctuation in that duration? Its no more difficult to consider an eternal universe as it is a finite one with nothing coming before as it seems...

From my understanding: The age of the universe is ~13.8 billion yrs. The age of Earth is ~4.5 billion yrs. The age of the Earth is based on radiometric dating. I understand that the Earth was probably formed by gas and dust clouds ~9.3 billion yrs after the universe was born, but if the gas...