Year Definition and 999 Threads

TL;DR Summary: This should be a simple maths problem Can anyone solve this as I can't. I found it in my son's school book which we cannot do. (see picture attached).

Hi guys, I am a first year IB student and I need to give hand in my research question for the extended essay today, the only thing is that I don't really know what I could do it on. The extended essay is basically a 4000 word research project. I was going to do it on photoelasticity, but when I...

Hi! I am 12, and will be a 13 in 9th grade ( I skipped 6th grade). I have a curiosity for mathematics and have started preparing to take the AMC 10 and 12 exams. I enjoy solving the ingeniously crafted problems, as I share the sentiment of many math competitors of not being challenged by the...

Thank you guys for taking the time to read this - I'm decently struggling with first year and need some tips on how to properly conceptualize problems and learn what the right approach is on certain problems. Have a wonderful day, again thank you for checking this post out!

I am interested in pursuing graduate reserch in physics. I have undergraduate and graduate degrees in engineering with a research in classical mechanics. However, PhD programs require a background in modern physics in order to be accepted and I would prefer to strengthen my preparation in...

So at first I thought that the time would be 10 years, and that I’d have to consider the outbound motion as v = .87c and inbound motion as v = -.87c but I’m struggling with addition of the velocities and whether or not this is even the right approach?

Currently in 1st year (UK) going through E&M right now, the recommended textbook is University Physics by S&Z. Recently had my-mid term test and got 40%. The problem is I’m overestimating my ability as the exercises in UP are not challenging at all, the majority of them are just plugging in...

Dear PF Forum, It's been a while since I logged in here. And I really do appreciate all the answers that I've been getting here. Now, I wonder. Is there any standardization for 1 light year distance? Is it 10 trillion kilometers, or 299,792,458 * 60 * 60 * 24 * 365.256 = ...

We've been speculating about this happening for a couple of years: https://www.cnn.com/2023/01/23/health/fda-covid-vaccines-strategy-shift/index.html I think at this point most of us saw this coming, but it will still be interesting to see how the transition happens, both for the vaccine and...

Oddly I remember having read about these events before (beginning of) year 2020. murder of George Floyd: https://en.wikipedia.org/wiki/Murder_of_George_Floyd Kenosha unrest shooting: https://en.wikipedia.org/wiki/Kenosha_unrest_shooting Capitol Hill Occupied Protest...

I'm 82 and was browsing through a old comic annual that was published back in the 1950's (Eagle Annual No 3). It had a puzzles page and one of the puzzles was quote: 'I have a pair of scales and 3 weights and with these 3 weights I can weigh any number of pounds from 1 up to 13.(I may, of...

Hi there. I am about to enter my final year of a computer science bachelor degree and must do a final year project that spans most of the academic year. I have some experience on the artistic side of computer graphics but none in the computer science side. I would be interested in developing...

Hello all, I am a physics major who will be starting their senior year next week. My immediate post-graduation plan is to attend graduate school in physics (my interests are in experimental condensed matter). However, I am strongly considering taking an extra year to graduate and was wondering...

Hello, I'm trying to learn calculus, what books would you recommend? For a beginner.

Using the above formula I get that the time goes 6.5∗10−86.5∗10−8 percent faster in ISS. Thus, this is approximately 2 seconds in a year. But the answer is much lower. Where am I making a mistake?

What would happen if they found a galaxy that dated to older than 13.8 billion years old? How would this affect cosmology?

Hi there. I start my final year of my computer science degree this September and, alongside other modules, will do an independent final year project. I have not had very much CS experience outside my degree so I am a bit unsure what would be feasible for me while not being too trivial such that...

Summary: I am just curious I know 🧐 Im coming up the end of intro university physics mechanics chapters. It has been quite enjoyable, especially chapters on energy, momentum and fluid mechanics. There’s so much information packed into these chapters though. I am wondering what was your...

I need advice! I know exactly what I want to do in physics: I am already doing research at my university as an undergrad and I plan to make a career out of it after I get my PhD. But I have had the absolute worst time with general motivation due to a decade of depression. I am so scared that...

These two will be the strong contenders for my photos of the year. There's our cruise ship, the Disney Wonder. And in the background, Dawes Glacier at Endicott Arm, Alaska. We got even closer to the glacier on an excursion when we got onto a catamaran. Photos were taken on May 25, 2022. Zz.

Hello, I am teaching eleven year olds about gravity. There is no issue about this subject, however I would like someone to help with a model answer. As mass never changes. What is the best answer when I am asked that if someone gets 'fatter', do they not put on mass? Thanks in advance.

Hey, I would like to do an exchange year at Imperial. I would like to follow as a physicist the Functional Analysis course. However, I have not heard the best things about this peculiar course. What is the audience opinion on that?

I failed all classes in my freshman year first semester. I am going to retake them.Does that affect my graduate admission?

My criteria for choosing this project-: 1) Should be easy. 2) Should be doable in 1.5 months. 3) Should not to be too easy and should be just hard enough to be a major project. 4) It is a group project but since this is nepal lol mainly 1 person is going to do it. max 2 persons will do this...

The original list of 10 candidates has now been parred down to 3. The Science Top Ten list: First footprints in the Americas? 23,000-21,000 year old human footprints in New Mexico. (al local record) Dragon Man skull Great looking old skull with a great backstory of it's discovery. Maybe the...

I got this as homework and I am not sure how to attempt it

If Tl;dr I am struggling in Math 171 and Physics 191 and throwing around the idea of declaring a geology major with an astronomy minor because the Physics major "juice is not worth the squeeze" at my age(29) anyone else out there who struggled with Calculus 1 when they first took it?Hello...

Hi Everyone, As the title suggests, I'm looking for some career advice. I want to go into software development (but feel free to suggest any other areas where I might be a good fit, I've also been looking at risk analysis positions). I have experience in a bunch of different areas but it feels...

Sorry for the speculative title but, I kind of think so. Both subjects are great discoveries and maybe they deserve the prize on their own (maybe not that is not my point). My point is how are they connected to each other under the vague umbrella term: "Complex systems". Their subjects are WAY...

536 AD - Worst Year in History (by Kings & Generals) https://en.wikipedia.org/wiki/536 Glacier cores reveal Icelandic volcano that plunged Europe into darkness https://www.science.org/news/2018/11/why-536-was-worst-year-be-alive The Worst Year Ever to Be Alive in History...

When something is described as say 7 billion light years away would't it be more accurate to 7 billoin years ago?

https://www.upworthy.com/3700-year-old-babylonian-stone-tablet-gets-translated-changes-history

If I work 4 weeks on and 4 weeks off, how much will I earn? My brother will be earning 1400 every shift, so would my brother earn $1,400 per shift x 5 days per week x 26 weeks per year = $182,000?

I self-studied Calculus 1 (AP Calc AB) in my sophomore year of high school and I got a 4 on the AP exam. I took the class Calculus 2 (AP Calc BC) in my junior year of high school. I did not take the exam at the end of the year. I didn't take any math in my senior year of high school. Because...

Mine expired in March 2020...I had it "hidden" under a laundry area sink and was using newer ones and forgot about it... Safe to open? Safe to pour down drain?

You are given the dollar value of a product in 2016 and the rate at which the value of the product is expected to change during the next 5 years. Use this information to write a linear equation that gives the dollar value V of the product in terms of the year t. (Let t = 16 represent 2016.)1...

As the title says, I am now in a Coronavirus induced gap year. I have been accepted at a university, which for some reason requires us to do a double major. Hence I chose math as my second major alongside Physics since it has the most overlap, and I'm also very interested in theory. In school, I...

Hi Everyone, I applied for some PhD positions in astronomy this year and was unsuccessful. I was wondering if anyone could offer up some advice for improving my applications for next year. To give you some context: I gained my Master's in Physics with Astronomy from the University of...

Hello All! I wanted to reach out for perspectives and advice on this "old-timer" wanting to do physics. At one point I was on that track, but quickly stumbled and lost my way for personal reasons. Now, I'm 35 years old and want to finally pursue a lifelong goal of a PhD in physics. My age at...

Hello, I'm in my final year of physics major in college. I have a semester left, and have to get straight A's this semester in order to have an average grade at best to further my education. I am not an "A" student. I've always been between the 55% and 45% percentile not because I'm dull, but i...

Hello, I am trying to solve this question: Assume that the Sun's energy production doesn't happen by fusion processes, but is caused by a slow compression and that the radiated energy can be described by the Virial Theorem: $$L_G = - \frac{1}{2} \frac{GM^2}{R^2} \frac{dR}{dt} $$ How much must...

How to make the most of a gap year during the Covid-19 era? =========================================================== Hello Everyone, Thanks for reviewing my thread. I am opening this thread to get insights into my future prospects for a career in Physics in the era of Covid-19. I...

As the title implies, I have a cube that was given to me new around 1980-1981. All the info I have found online indicates my cube is likely not an original. I would have thought at that time there wouldn't have been knock offs, but it's entirely possible I am wrong. - The colors on my cube do...

For me, this song sums it up quite nicely: What do you hope for Christmas this year?

If a power plant generates at 23MW, how many kWh will be generated in 1 year? And how many miles could you drive Tesla cars, at highway speeds (70mph), in one year? Thanks

Might need to take 5 courses in one semester. Are these courses too much? I would have to take: -Second year linear algebra -Real analysis -Mathematical modelling (a relatively easy course involving only high school calculus) -Second year calculus -Second year E&M. A plan I thought of...

Hi, I needed some help/advice. I am a Math Major at Dickinson College. I am also taking lots of courses in Physics and Philosophy. At this point, which is the fall semester of my junior year, I have: - 3 more courses left to complete my Math major. I still need to take Abstract Algebra, a...

Could this year's flu season be used to determine the effectiveness of virus masks? Every other person if wearing one, so if flu cases are significantly less than normal, that means that virus masks are having a noticeable effect?

Hey everyone! I started Astronomy Ph.D at a very good (as good as any top university) university this fall but I'm struggling a lot and it's only been 3 weeks! The problem isn't the amount of stuff that I have to do (I am taking two undergrad classes, one grad class and am being a TA), it's...

Since the Earth orbits around the sun and very slightly changes its relative angle and position, does the brightness of a particular star change from season to the season?