Physics Definition and 987 Threads

I have read online that the optimal amount of time to study for is 30 minutes followed by a 10 minute break and repeat. Dose anybody else please know of a good study schedule? Many thanks!

with scholarships making the costs relatively the same, which college would you choose for physics major - rutgers, stonybrook or rensselaer? bs in physics, not engineering. don't want to choose research interest area just yet but likely interested in grad school more than industry right after...

TL;DR Summary: Imagine you have infinite funds and cooperation to build a very ideal curriculum and student organization, both dedicated to quantum information science, at a university. What does this look like pedagogically? How would this be structured? What resources do students need access...

Hello all: Watching few news , titanic came and we start to have a question , can I prove that titanic was sunk because of hitting an ice mountain, and not because of torpedo, should we use material specifications , speed of the ship , and material specifications of the ice mountain or we...

Hi it's my first post here! I'm in my second year of my degree and looking to replace my computer. The new M-series chips seem like a better deal, however I am nervous that some software that might not be compatible with the ARM architecture. For more context on my workflow I do quite a bit of...

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...

hello I am interested in computational physics at an amateur level is it worth while learning complex numerical methods with C++ /Python to solve partial differential equations as well as for other physical applications while a software such as mathematica can do the job for you ?

I'm a physics undergraduate student. Im gonna try to tell you the short version of my story. I used to be in a different science field, but always wanted to pursue physics. The reason I didn't do so at the start is because my parents were opposed to the idea (i was 17 and didn't argue much at...

I want to know how hard is to get a Master's in Physics from SJSU. I am not a Physics major and I want to know if by attending this program will I be able to do other personal activities or is it likw I will just be studying all the time.

In this popular science article [1], they say that if our universe resulted to be non-uniform (that is highly anisotropic and inhomogeneous) then the fundamental laws of physics could change from place to place in the entire universe. And according to this paper [2] anisotropy in spacetime could...

First of all, the pulling force is 300N cos(30) = 260 N At this point, I try to find the friction force Fn = mg = 20kg * 9.81 m/s^2 = 196.2 N Then, Ff = μ * Fn = 0.5 * 196.2 N = 98.1 N So after canceling the horizontal forces, 260N - 98.1N = 161.9N And the acceleration will be 161.9N / 20kg =...

Hey everyone. Let's say you have a tall tree. say, 10 m tall. Take a cubic cell 1mm in dimensions. Suppose the cell is at 1 m high in the center of the trunk of the tree. What are the forces acting on the cell? let's say tree cell's mass is t grams. its weight is F= ma = t (9.8) = 9.8 t...

I'm a diving coach at the local YMCA and I want to give a lesson regarding the physics of diving off the board with maximum efficiency. This is the type of diving board with an adjustable fulcrum, basically a lever with one end fixed with bolts. Its been almost 15 years since I've taken a...

Maybe it is my present circle but I see a lot of students pursuing Astrophysics and related domains in terms of projects, Master's Degree etc. and I wonder what are the reasons for the same. Is the field extremely "hot" or is it just saturation caused by excessive Pop Sci influence? Full...

Hey all, Long time forum lurker here. There's a lot on my mind, but I will do my best to keep it concise: I'm an undergrad chemical engineering student, just starting my junior year. I have found myself at somewhat of a crossroads concerning my career pathway: Originally, my plan was to finish...

Out of curiosity, how fast are the hands of the pros? I have timed an exchange between BJ/ALW and JD/JI that occurred at the Baird PPA in September 2022. The ball made the (about) 14 foot trip 11 times over 4.0 seconds, for an average trip time of 363mS (milliseconds). (Average speed of 26.3...

Hi, I am 25 years old living in EU. I am posting my experience with the objective of getting advice or opinions. I have a bachelor in physics with a thesis on the SM electroweak sector. I have a master again in theoretical physics with a specialization on Hadron Physics ( QFT ). Both of my...

Hi There! I am quite a beginner at physics and my aim is to apply physics to a computer program which I'm coding. The program consists of 2 balls of equal mass colliding into each other and demonstrating the trajectories after an elastic collision. I have already coded a more basic model...

Hello, I'm currently a phd candidate in pure maths, doing research in Ergodic Theory (concerning ergodic convergence theorems). When I started studying Ergodic Theory I ran into Statistical Mechanics and I immediately fell in love. I've started studying physics from scratch. As my current...

My attempt at Q3 yielded: 3a) F = Mu.n = Mu x m x g as a function of layer = Mu x m x g x n x i where n = number of blocks per layer and i = layer number. 3b) From - Fn = n x (LWH) x density x gravity x L/2 = F x d where n = layer number d = (n x L x H) / 2 My attempt at Q4 is there should be...

Hello, it looks like I have a lot of reading to do here. It looks very interesting.

Hello everyone! I have a visit day for a school coming up that they booked my hotel and flight for. I was initially interested in the program, but my partner recently received a dream job offer in Boston. I have been offered a spot at two PhD programs there, so I'll likely pick one of those in...

For curiosity (obviously not having anything better to do with my time) I turned my spectacles the ’wrong way round’ - so that they were upside down, with the arms pointing outwards - and looked though them. (This gives the correct lens for each eye of course.) The image is noticeably worse...

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Are you suggesting that mathematicians are sometimes better than physicists in spotting the real problems in physics? (Just asking.)

I'm looking to compile a large online database of physics formulas*. I have yet to find any comprehensive "physics list" that isn't too domain specific or simply scalable. My attempt will be to build it here newtondb.com following and expanding on pldb.com. It will be built using a treebase...

выбранный контур контура и получившаяся система также показана на фото.

I will start my Master's in Physics next August at San Jose State University. If I decide to start a PhD in Physics once I am done with the Master's, will I still need to take courses at the PhD? Or will I just have to do the research?

For those who have built those small model rockets, please help me understand a very very simple physics problem that i for some reason do not fully get. Why is it that the motor tube does not have a retention ring on it, to prevent the motor from flying out the nose cone? i know it cant be...

Is it possible, that one physics law is "Everything is in motion?" (since zero doesnt belong to nature)...if so, does that implies that black holes move?

I am curious to know if there are any notable differences in the amount and difficulty of the questions between Fundamentals of Physics Extended 11th Edition and Principles of Physics 11th Edition. Additionally, I would like to know if both textbooks treat the theory in the same manner in terms...

Was wondering if anyone knew of any good resources with programming challenges akin to the website "Project Euler" (about page found here). To be more specific, I'm looking for something consisting of problems centred around physics topics that would require some level of problem solving and...

In the solution below it says 22% goes to 0.0309keV. From the diagram above I interpret 22% goes to 0.1298keV with EC(L)/EC(K)=3.0 and not 4.4. Why is that wrong ? Thanks alot!

I was wondering if anyone knows of any technical pop-sci books about condensed matter physics and/or superconductivity that are at the technical level of something like the "A Very Short Introduction" series or the Feynman lectures. That is, something that goes sufficiently into depth into the...

Is it possible that when you dream, you are actually traveling through different realities, and going into the consciousness in another reality? This seems to explain how our dreams can be similar to what we preceive as our "actual" reality, or drastically different. You can also tie this...

Hello! My research is mainly in atomic and molecular physics but from time to time I come across nice experimental setups, that show promise for my work, from other fields, like chemistry or even high energy physics. I was wondering if there is a more organized way to explore experimental setups...

Hello folks, I am Alex, a guy in his 20s with autism who enjoys science and physics. After a search, I have joined, cos I want to be able to talk with like minded individuals who share the same interest in science as I do. Also, I am currently working on figuring out the inner processes of a...

Scientists recently observed a kilonovae explosion. To their surprise, the explosion is completely spherical. They are saying that this is the cause of unknown physics but I don’t understand why they think unknown physics is causing this. What’s unknown about a perfect spherical explosion? My...

Hi everyone. I thought I would pose the question in the title to those on Physics Forums that are currently working in physics research (either as faculty, postdoctoral fellows, or graduate students). I was thinking of setting up a poll, but the last time I had asked a similar question I...

Hi. I am looking for scientific papers, articles and/or even simulations that investigate how many moons it would be possible for earth to have and maybe modern theories about what these moons can be and look like (i.e what characteristics they have) if they were to exist. I have googled and...

I am going over the diffraction condition section in Kittle's Introduction to Solid State Physics physics and I am having a hard time understanding why the phase difference angle for the incident wave is positive while the phase angle difference for the diffracted wave is negative. Thank you...

Cymatics devices using sand allow us to create shapes with sound. Do you know if those shapes depend on the density and the size of the plate? Thank you

TL;DR Summary: Using vector functions how can I find the minimum average velocity (something greater than 11.86m/s) of a ball if the launch angle is unknown and if I have a point that the object must travel through (11.86, 3.47)? In my assignment, I developed a function for a lob shot...

Okay so I am a little confused as to where I made a mistake. I couldn't figure out how to program Latex into this website but I attached a file with the work I did and an explanation of my thought process along the way.

In physics there is a notation ##\nabla_i U## to refer to the gradient of the scalar function ##U## with respect to the coordinates of the ##i##-th particle, or whatever the case may be. A question asks me to prove that $$\nabla_1U(\mathbf{r}_1- \mathbf{r}_2 )=-\nabla_2U(\mathbf{r}_1-...

So this isn't actually a homework question, it's a question that was on the test I just took and I cannot figure out what I'm doing wrong. I've tried solving it three or four different ways, double checking everything, and I keep getting ##15 + 3\sqrt {15}## or ~26.6, which was not one of the...

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i notice with physics, all the equations are a bunch of scrambled sentences or variables being multiplied together. why the multiplication for everything?

Can I become a biomedical engineer after completing a Bsc in Medical Physics?