Physics Definition and 987 Threads

The reading on the voltmeter is 0. I figure the potential drop through line AB must be the same as the potential drop through AC (since voltmeter is zero). As such, the 10 Ohm resistor has the same as the effective resistance of the parallel branch. 1/10 = 1/8 + 1/R 1/R = -0.025 R = -40 Ohms...

I wanted to join this forum because of my interest in physics and the fact that I am learning it. I would say that I enjoy every area of physics, there is not one that does not interest me. In addition to physics, I am also interested in forensics, mathematics and a little bit of chemistry and...

So I do know that there does exist a generalization of the cross product (the exterior product), but this question does not concern that (and I would prefer it not ) I know that the cross product (that Theodore Frankel, for example, calls "the most toxic operation in math") works in 3D only...

Hi All, My name's Théo I am currently finishing up my Bachelor's thesis at TU Delft and working on some other projects in a research group. I will be posting some questions I have on here and try to participate in as many conversations as I can. I want to build experience in academic...

I'm a mediocre physics student (at best) at an Ivy League institution, and I'm passionate about general relativity. My dream is simply to do research in the field, even though I will never be a superstar or pioneer. Finally, I'm planning to complete a Master's in astrophysics or physics...

Let the radius of the larger sheave in the upper pulley be r1, and the radius of the smaller sheave in this pulley be r2. Given, the larger sheave has n notches in its circumference and the smaller sheave, (n - 1) notches. Therefore, 2*pi*r1 corresponds to n notches, and 2*pi*r2 corresponds to...

Hi, I am Nirmalya. I am from Kolkata, West Bengal, India. I have a lot of interest in Physics.

Hi im a civil engineering student who's always been interested in physics since i was young, am taking classes in physics now.

Hey all, I finished an undergraduate degree in physics (conc: computational) last winter and I'm looking into grad schools and trying to work in field while I take a little time off from school. My physics education might be a little lacking but I am looking forward to growing with your...

Hello, I am Quinn EcSolticia. I value rationality and human intellect; whilst my main interest lies in mathematics and theoretical physics. I am currently an 18 Y/O student, but I have a deeply clarified purpose that guides my life which I do not think might really change very easily in my...

Hello, I am new here. I am Gabriel Mwamlima from Malawi currently in the third year at the University of Malawi

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an assumption being that since the M ( that is mass is a constant for the vehicle ) and a being the same as if the vehicle were to have been crashed into a stationary obstacle, that F would be the same as if said vehicle were to have been crashed into a stationary obstacle and not another...

I got the hamiltonians for n1 and n2 as (n1+1/2)hw and (n2+1/2)hw. Since the an ensemble is made by N distinguishable pairs of quantum oscillators, the general canonical partition function for the system is 1/N!((sum(-BH(n1))sum(-BH(n2))), where B is the thermodynamic beta. I got to the step...

TL;DR Summary: why is the answer "all of the above"? Could someone explain why the correct answer is all of the above? I understand that Cv implies a constant volume process, but what about the other two?

TL;DR Summary: I have spent all day on these 2 problems but i cannot solve them. Can somebody give me any clue on the solution?

I do not know much about this, please help. My truck seat back cushion is 2" thick. Truck A is ~5,700 lbs from google. 2011 f-150 super cab 6.5ft bed. Truck B is ~5775. 2015 GMC Yukon xl slt. If truck A is stopped and braked and truck B hits truck A going 45-55mph creating a force of...

Which of the following are true for sinusoidal radiation? 1) The electric field and the magnetic field have the same magnitude at the same point in space. 2) The electric field is perpendicular to the magnetic field. 3) The source of the radiation is oscillating charges. 4) The radiation pattern...

Hi! I am Mateo, and I'm interested in physics!

Im going to make this quick High School Student currently in AP Physics 1 with strong math background(Currently in Calc BC) Problem: Consistently stuck at a B+ no matter how much practice Goal: Try to reach at-least an A- Issue: I find tests consist of materials that I haven't practiced before...

I'm currently a senior in high school and i'm looking for a challenging physics project to do for my physics class since we are supposed to do one during our whole senior year. I first tried to look into fusors but my parents are scared it might be too dangerous -- what are some challenging...

I only have my AA so far (working towards physics degree), but I would like to start changing directions career-wise. I'm completely burnt out on my current field (went through several careers over the years, but lately, it's been sales, and I HATE sales, just good at it). I would love to do...

𝐹𝑃𝑥 = 93.6650N sin (85 − 90) + 28.11N sin(180 − 85 − 79) Fpx= -8.16344N +7.74816N 𝐹𝑃𝑥 = -0.4154 N←

TL;DR Summary: Got my AA with a focus in physics nearly a decade ago. Looking to go back and finish what I started, but need to brush up and looking for good resources to do so? Looking for resources that are thorough that can help me brush up on calculus 1-3, physics 1-2, and possibly...

G'day. I only have a lay interest in physics - I don't math or anything - but I think I get the jist of it. It's weird, huh?

Circuit diagram

Hey, I was just contemplating career opportunities after my Undergrad. I am slightly interested in theoretical physics but I can't imagine doing it the rest of my life. My main interests are nano-photonics and quantum technologies and I am planning to do research in these fields. I am not...

Do the contractions affect physics in any frame? Examples: If length contraction reduces mass in the direction of motion, and therefore reduces the total momentum. (from observer's perspective) If in the reference frame of a station, the moving train weighs less than it did when parked...

I know that we can answer it using conservation of energy or using N's 2nd law. Using N's 2nd Law: ##F = mv \frac {dv}{dx}## ##Fdx = mvdv## For spring we have : ##F=-kx## ##(mg-kx)dx=mvdv## We'll get same result using above equation. My question: Average spring force from 0 to x is ##-\frac...

Hi. My story is weird and I need help. Brief backstory: I'm 21 and my brain is completely empty. As a kid, I didn't realize how interesting it was to do science and learn about anything, so I was weird. I'm the same way now. I can talk and talk endlessly about some unusual and difficult topic...

Hello, I am following the paper: https://www.yumpu.com/en/document/read/42212557/exact-exchange-in-density-functional-calculations and I am confused on page 14 where the generalized Kohn-Sham equations are derived. I follow that the ground state energy is The minimization of this step leads...

Hello! My name is Eleonora but you can call me Leo. I'm a girl. I love mathematics and physics and I aspire to become a theoretical physicist one day (or maybe this will change someday, but for now it's my biggest life goal). I still go to school. I want to self-study physics and find fellow...

I have never been sure how to round it according to the rules. My steps: ##\sqrt{5 \cdot 9.81 \cdot 0.10-\frac{1}{4\cdot \pi \cdot 8.85 \cdot 10^{-12}}\frac{(1.0\cdot 10^{-6})^2}{0.150\cdot 0.10}}## In [ ] is number of significant digits using multiplication/adding etc. rules. ##\sqrt{5 \cdot...

It would be interesting to build such a Bomb. "What kind of a Bomb? the Exploding kind!" Peter Sellers.

Force free: ##\mathbf{J} \times \mathbf{B} \sim (\nabla \times \mathbf{B}) \times \mathbf{B} = 0## (N.B. MHD applies so ##\epsilon_0|\partial \mathbf{E}/\partial t|/|\mathbf{J}| \ll 1##). Axisymmetric: can write ##\mathbf{B} = \nabla \psi \times \nabla \phi + B_{\phi} \mathbf{e}_{\phi}##...

I am a physics teacher. Teaching high school physics for more than two decades. I love to interact with colleagues who can share the variations made in the field of physics especially in the high school curriculum. The terms usually change and this effect the exams for students due to the use of...

Hello! Im a 25 years old italian student, currently master degree in quantum engineering. I decided to write in this forum one of my new ideas in physics. Im always very curious and mind open on new arguments!

I hold my identification card on a low-friction surface by one of its edges. I slightly lean it, and it starts to fall. Before it falls over, I place my finger against the card, and this prevents it from falling all the way over. Then, I withdraw my finger without pushing or pulling the card and...

Consider ##n## moles of a gas at a constant temperature ##T##. If we vary pressure ##P## and measure the corresponding values of volume ##V##, we can make a plot of ##P\frac{V}{n}=Pv## against ##P##. This gives us some graph which has some form. Turns out that for a range of pressure starting...

I'm a physics major at central washington university, and this forum looks like something I might be using from time to time :) nice to meet everyone!

Homework Statement: My question is how do you approach a new topic in Physics?, I'm starting grad school next semester and I think that I don't have the best routine studying Physics, so I wanted to know what are your best tips to learn something new in physics? Specially after the pandemic I...

Hey guys it would be great if you could take a look at my statement of purpose for a physics PhD program included below. The "Future Work" section at the end is where I talked about the specific program and faculties and how it will be a great fit for me. Any comments, criticism, advice is...

Several years ago I found your thread (now inactive) called "How can I get rid of air buildup in a syphon system". I am not a physicist, I am a tool and die maker and it really helped me get a better understanding of the problem and confirm what I was seeing. Since then, I have developed a...

Hi everyone, This will be a long post. I spent a few days mulling over what I wanted to say. I’m not sure I have thought of everything, but I covered a good body of what has gone through my mind, with any other details I’ll bring up as they pertain for any good Samaritan who can offer any...

Probably, my last question about isotropy. This is the last thing that I want to double check. We know that mathematically, passive and active transformation are both the same. In passive, coordinate frame is moved and nothing else, while in active frame, objects are moved and coordinate frame...

Yes... Can someone please explain the relativity theory to me in as much simple terms as possible. It's really way in over my head. Thanks.

Heads up, I'm Johnpaul. Came across this forum on Google. And really surprised that it has the exact name I needed. Thank God! I have a real interest in physics but I feel like I know nothing. Yeah the basic stuff such as electricity, Motions, Force, etc are there but the A-level physics is...