Year Definition and 999 Threads

1. 350*(1+(0.0311)/3)*ln(1+(0.0311)/3) 2 and 3. Not sure how to answer these questions.

My 50 year old science book says, black is absence of all color. Do any books still say, black is absence of all color? I looked online for 30 minutes no where say, black is absence of all color. NOW everything says, Black is the darkest color. Why the change in books? If black is not a...

From Wikipedia: So should this be interpreted as the axis of the sidereal lunar plane precessing at a rate of 346.62/366.25 of a revolution per sidereal year (i.e., the ratio of the draconic & sidereal years) about the axis of the ecliptic?

I'm in my second year, and I feel very discouraged and scared. I don't know what I'm doing, and I'm questioning whether this is right for me. I was doing very well, acing everything, until last semester when I was juggling two jobs, one full time, and ended up in the hospital during midterms...

How to calculate the wavelength of light coming from 1 light year away. Is there any formula for it. Please help.

how would the year 2011 appear in standard form

I wish a happy new year to everyone!

This was a marvel of technology for the time. Leave it up to the Greeks to invent something like this, they were at the forefront of innovation in the ancient world. https://en.wikipedia.org/wiki/Antikythera_mechanism

P = 49000; R = 57 1/7%; T = 4 yrs; SI of 2nd year = ? R = 57 1/7% i.e 4/7. i.e Interest/Principle. Principle; 7 corresponds to 49000. After this how to proceed?

Hi there :smile: Anybody out there able to explain to me how to calculate what the true length of a sidereal year was about 6000 years ago ? Kind Regards Edwin.

Science Magazine is holding its annual vote for the people's choice for Breakthrough of the Year, which will accompany the editors' own choice. Voting is open until Dec 2, after which they will narrow the field to the top four choices for a second round of voting. You can place your votes at...

I live in North Central Illinois. I just noticed that this year there are almost no dandelions in anyone's yard. Normally I would see them everywhere but I've only seen a handful. We have had an odd summer this year. We went from warm with an abundance of rain that delayed crop planting to below...

I can completely clear out all large rocks from my garden so it's just soil and pebbles down to about a foot. Then come next spring I find new large rocks again. Happens each year. This is a common problem for farmers and gardeners. Causes I've considered include: -- Ice heaves that push up...

Hello. I have been studying Biology as an undergrad and in my second year have discovered an interest in the biophysics area. I have taken 2 biophysics courses as an undergrad (introductory and more advanced) and have successfully made it into a Biological Physics Masters that is going to start...

The question is in the image. Working out with every step would be much appreciated.

I don't know how to make the practical or what practical I can conduct that would test the question we have been given.

Hi all, I just want to gain some perspective as I am sure there are people in the same boat or have been where I am. I am in the home stretch of my Ph.D in Biomedical Engineering, I have manuscript published and a couple more in the pipeline. I work in big data and how to use it to come up...

Previously discussed in the "Space Stuff" thread but this is a long-term project. What is Starship? SpaceX is working on a fully reusable two-stage rocket to replace the partially reusable Falcon 9/Falcon Heavy. It is the largest rocket that made it beyond the concept phase so far; the payload...

I would like to ask if anyone has been admitted to a graduate school(US) straight to 2nd year after a theoretical masters MSc degree in the UK. I am asking because I would really like to study in the US, preferably on top universities but I don't want to waste another year taking essentially...

I tend to buy at least 1 geeky t-shirt a year, just for the heck of it. I can't not buy this one when I saw it last week at the Chicago's Adler Planetarium during their Members Night. Most of the people I was with didn't get it. I mean, they knew that it has to be "Force", but they couldn't...

Hi fellows. I am dealing with the following question and any help to solve it will be a huge favor. Let us consider a nuclear power plant which delivers 100 MWe. The plant is based on a Rankine cycle, where the steam exiting the reactor is at 350 C and water exits the condenser at 20 C. The...

Hi, I'm working for a company that want me to calculate something for them. I haven't done physics since A level so have forgotten a lot of it and am now very stuck! They want to know the kWh per year they will be saving by reducing their heat loss (which they have given me in watts per meter)...

I thought this would be easy to find - but I can't find it. All the data I can find on-line is local to location. I am looking for data showing the highest recorded temperature on the planet per year over the past 30 years. Does anyone know if such data is compiled / accessible?

I made $29,615 in 2017 and my tax return was $838. I made $36,892 in 2018 and my tax return is $592. I didn't go up a tax bracket. The only thing different is I made a little more money. Why did my refund go down? Any ideas?

Since the Sun orbits the Solar Systems' Barycenter about once in every 12 Earth years, wouldn't it make sense to say the sun has a "year" - at least in a casual way? After all, although the sun has a lot more mass that the Earth, it orbits the Barycenter no less than the Earth does. We talk...

2019 is the smallest number that can be expressed as sum of 3 squares of prime number in 6 different ways 2019 = $7^2+11^2+43^2$ = $7^2 + 17^2 + 41^2$ = $13^2+13^2 + 41^2$ = $11^2+23^2+37^2$ = $17^2 + 19^2 + 37^2$ =$ 23^2+23^2+31^2$

I wish a Happy New Year to everyone!

Hello fine friends, I'm looking for some advice. I'm a second year physics student and my GPA is 3.66. I currently work full time in sleep medicine as a registered polysomnographic technologist (RPSGT) and really enjoy working with patients, treating their sleep disorders, and, essentially...

Hope you all have a happy Christmas and a fruitful new year, may be you can post your accomplishments for the new year?

Hey everyone! So, I just finished my 2nd year intro to SR course, we spent most of the term on Taylor expansions for relativistic corrections vs concepts. I’ve watched a crash course video and a documentary on SR and I do somewhat understand the thought experiment involved with respect to...

Science Magazine is holding its annual vote for the people's choice for Breakthrough of the Year, which will accompany the editors' own choice. Voting is open until Dec 5, after which they will narrow the field to the top four choices for a second round of voting. You can vote here...

I'm a student in a UK university and have the option of spending my 3rd year abroad in the USA or Canada. My primary motivation for doing so is the ability to do research during the academic year (which is impossible to do in the UK), which would make me more competitive when applying to...

is toxic. An old word, its being used in lots of new ways. This article discusses the choice and competitors. Started me thinking a science word of the year could be interesting.

I have two job offers: one from a community college (CC) and the other from a four year liberal arts college (LAC). Location: both are in the same area (with 20 minutes from one to the other). Salary: both jobs offer comparable salaries (four year college about $5K/year higher) Benefits: CC...

A study conducted at a certain college shows that 55% of the school's graduates find a job in their chosen field within a year after graduation. Find the probability that among 7 randomly selected graduates, at least one finds a job in his or her chosen field within a year of graduating

Basically, I'm a Physics/Math MSc student. Currently strengthening my background in Diff. Geo., QFT, GR. I feel like I should start reading some research papers on Quantum Gravity but I do not know where to start. What papers should I start with? I need papers that are accessible to 2nd year...

Some background: I'm a mathematical physics (it's not focused on the field titled mathematical physics specifically, but rather it's a general math and physics degree) student in Canada. (Update if you saw my last post about struggling in linear algebra 2 - I have been doing very well in groups...

Three business partners, Q, R, and S, agree to divide their total profit for a certain year in the ratios: 2 : 5 : 8, respectively. If Q's share was 4,000, what was the total profit of the business partners for the year? My Reasoning: 1. The variables listed represent 3 people. 2. The word...

Hoping I can find some help here, anyway a bit of context; I studied Maths/Physics/Computer Science at A-Level (Finished at 18 years old, not sure what that is in America), and passed them all with good grades, and decided to take a gap year to work on some own personal aims/goals of mine...

So I'm learning some basics about astronomy...and this right ascension value is defined as being measured eastward along the celestial equator from the vernal equinox...now as I understand it, the vernal equinox only occurs once a year (the first day of spring, in the northern hemisphere), so is...

Hey everyone! So, I’m starting my second year of physics this Wednesday ,but I have a bit of a problem. I’m having trouble recalling concepts and fundamental details from first year. I took a full year physics course in 1st year (divided into kinematics/ dynamics -first half and Electricity...

Hi all, It's a few short months before grad school applications are due, and I find myself in a bit of a dilemma. Prior to my junior year, I knew what I wanted to do is physics research for my career, and I'm particularly interested in biological and condensed matter physics. My skills are more...

Hello! What can a first year PhD student (in an American university) do, research related, in the field of Theoretical (mainly high-energy) physics? I know in the USA you need to start research from the first semester of PhD (even if you formally choose a definite field of research at the end of...

Seems that us animals got an even earlier start than we thought. Short popular version: https://www.livescience.com/63289-ediacaran-leaf-fossil-is-animal.html Longer version: http://www.dailymail.co.uk/sciencetech/article-6043177/Animal-kingdom-OLDER-previously-thought-scientists-reveal.html...

About to go into year 11 and doing physics anything I should do to be ready and get an edge?

Hello, I will be starting the 4th year of my Mphys soon, and I'd like to get a little bit of a head start on the topics that are going to be taught, can anyone recommend me any decent textbooks for the following modules? (I will insert images of the syllabus for each module if that helps) 1...

I’ll be taking the year long physics sequence at my college this fall and I want to know what specific math topics I should master, so that I can conquer my first year of physics. I’m planning to brush-up on any necessary topics from algebra, through precalc, and including calc 1. It’s an honors...

Background: https://translate.google.pl/translate?sl=pl&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fwww.syllabus.agh.edu.pl%2F2018-2019%2Fen%2Fmagnesite%2Fstudy_plans%2Fstacjonarne-inzynieria-mechatroniczna%2Fmodule%2Frme-1-101-s-matematyka-1&edit-text=(mindless applying of 'algorithms'...

Hey! Im going into second year and I’m trying to find textbooks to study for some physics courses out of since I have the time. Heck, even some multivariable calculus textbooks might help. We use James Stewart’s Early Transcendentals 8th Edition and it didn’t really help- that and uh I...

Was just wondering if this course load is too much for a junior, I’m aware everyone is different, but let’s generalize the case. 15 credits; Quantum mechanics Statistical mechanics Methods of Theoretical physics Partial differential equations w/applications Geography elective I am afraid...