Physics problems Definition and 189 Threads

I was curious if there were any unsolved physics problems and if so which is the most important or intriguing. I have been meaning to contribute to the scientific field in some capacity and I think solving an unresolved issue in physics could do just that. Thanks!

The question is on the title. I was just thinking if exist some magazine on physics and maths whose only focus is to publish interesting problems and solutions?

Hello All! I recently finished my undergrad but to be honest I actually feel like not learning anything. I could ace the tests because I knew the "pattern" of questions that would come but now if I open an EM textbook by griffiths, I am pretty sure I understand the topic but struggle a lot in...

I tried to solve it and I got the following is it correct? and 2 My solution... is a negative distance?

My attempt: At first, only a small part of the chain has fallen through. Let that part have mass m, speed v, and length x. Suppose the chain has a mass per unit length of u. To accelerate a small length of chain on the table to speed v, Force needed = v dm/dt = v (dm/dx) * (dx/dt) = uv^2...

I do not know how to do this because in order to find the force of gravity it seemed to me i need to know the mass of the planet and vice versa, and for the 1st exercice i do not know whether the planet fills the astronaut's field of view. If it does in understand that i need to use trigonometry...

So I'm currently doing research on studying physics by visually impaired children. I know, that there are many techniques to teach such a kid physics, but what I don't like about these techniques is that they are mostly tactile-based and implement graphs and illustrations in Braille and...

I am trying to gain some perspective into the topic of «number of valid digits» when doing physics problems. I have been doing physicsproblems for å long time, but i have never really understood why the rules regarding number of digits to include in the final answer - is the way that it is. I...

I am taking an introductory physics course at college right now and honestly, I'd rather take an uppercut to the jaw then take another physics class. I'm great at Mathematics(that's my major) but I just can't seem to get any physics problems. I have so much trouble setting them up and solving...

Hi! As the title suggests, I am searching for some good problem books with really challenging problems for classical physics, more precisely on the topics of electricity and elecromagnetism, geometrical optics and wave optics, thermodynamics and analytical mechanics. When I say challenging I...

(for undergrad) What is the best book that I can use with the book Serway?The problems in Serway are not enough for me

(Sorry for Length) 1. Homework Statement You have decided to use a CCD camera to check if a 16th magnitude quasar is variable. You can presume that all of the light of your quasar falls on one pixel. You know that a star with a magnitude of 0 would deliver 1 × 10^9 photons/second to one pixel...

Hello everyone! My finals in physics are in the corner (actually in 6 days) and I have studied a lot. Tho, my teacher yesterday told me that in the exams, unfortunately, I won't be able to make the hard thought or solve the hard problem. And that almost 1 week before just took me apart. And ok I...

When solving a math or physics problem, the process usually starts with recognizing what type of problem it is and which equations need to be used. This is simple for more straight forward problems. If they give you mass and acceleration and ask you to find the force, you have all parts of the...

Generally, what are the steps in solving a physics problem? Some problems are straight forward, and you can just plug some numbers into an equation to get an answer, but with other problems, I sometimes don’t even know where to start. I generally just solve the problem by fiddling around with...

Hey guys, I'm looking for some nice new physics challenges similar to physics.harvard.edu Problem of the Week or the 2 star and above problems in Morin's Intro to Classical Mechanics (also Feynman problems). Where else can I find such problems? Or does anyone know of a few that they could share?

I am trying to solve some physics problems but sometimes I miss some stuff.Like in the logical part sometimes I forget to include some force or things like that.I am a freshman student. Is it improve over time (to see the missing part that I couldn't see ) or ıt depends the question number...

Out of the 6 remaining Millennium Prize Problems, two concern physics, the Navier-Stokes smoothness problem and the Yang-Mills mass gap problem. What I'm curious about is, if both problems were to be solved right now, what would be the immediate experimental and/or technological impacts of the...

Homework Statement Question A car starts from rest and uniformly increases its speed at a rate of 0.7 m/s2 on a circular track of radius R = 253 m. What is the magnitude of the car’s net acceleration after 50 s? acen=.7m/s^2 t=50s R=253m Homework Equations Equations acen=(v^2)/r Maybe...

I try doing the assignments and I just can't do it, like my approach is completely wrong. What do you think went wrong? What is the best way to approach this? Thanks

Hello, i am not sure where to discuss it but here maybe proper for this thread. I just want to discuss about DC's Tv show Flash and physics on it like singularity or parallel universes?

Homework Statement explained on document attached Homework Equations Energy on a spring and work done by friction The Attempt at a Solution Included on document https://docs.google.com/document/d/1FNrmIkkWzyZJNsbGbq_DYMyMZbpyMcAYKYk9iTbdR-4/edit?usp=sharing

My name is Amit Gupta and I am a teacher of physics and calculus, I have experienced in physics last several years, I love to solve physics equations, Anyone who have problems in physics and calculus subjects, I will provide you a right solution through problems practice. We are working towards...

Homework Statement 1 c and e from the jpeg image. Homework Equations W = Fd KE = 1/2mv^2 The Attempt at a Solution P = 42.875 * 60 J / 5.3s P= 485 W and I don't know how to start 1e. Could you please help me.

From time to time I hear about people coming up with creative/"non-mainstream" solutions to classical physics problems, whether by looking from a very different angle or using some unusual math that's unknown to anyone but that one slightly quirky professor from faculty of mathematics. However I...

Homework Statement :A skier is being pulled along a horizontal surface at constant speed with a force of 50.0 N. What is the weight of the skier?coefficient of kinetic friction=0.05. My main problem is that what "at constant speed" implies here?i.e A skier is being pulled along a horizontal...

I'm a sophomore Physics major currently taking Mechanics, and I recently noticed something when I was going over some homework. I am really good at Calculus, and I noticed I tend to do way better on the calculus based problems (i.e. work, finding force from potential energy etc) than some of the...

I have created an initial state code with perodic boundary conditions and normal distribution of velocities. I not know where is the problem, when I compile the computer detect the 112 error. Could anyone help me please? Thanks! the code is...

I am supposed to take calculus next school year but I want to do some physics work over the summer. Can anyone provide me the the most common calculus problems in physics? I was thinking that derrivatives, integrals, limits, and infinate series would be the main ones but I am likely wrong.

Well well, I just realized that this page has a wonderful forum for sharing out member's ideas as well as doubts about love. Anyway I really appreciate whoever there proposed to make this forum. Just a doubt that I haven't actually experienced yet but I am sure it will cause me some trouble...

Im searching for free a book called "200 puzzling physics problems" do anyone know how can i find the full version online? thanks!

Homework Statement Hi please help me with these 2 ray diagrams... the questions is as stated in the attachment..i have no idea where to start drawing and whatever i have drawn is wrong for both qns.. thanks a lot experts! Homework EquationsThe Attempt at a Solution

Hi, I have some basic problem with solving physics problems. I cannot solve the quantum or statistical problems without help or by myself. sometimes the problem is that I don't even get what to start with. I am in my undergrad last year now. do you have any suggestion how to improve my problem...

Can anyone introduce me some physics that contains difficult classical physics problems?

Hello, Recently, I had been looking at Physics problems, and Physics word problems to be more specific. My question is, are simplifying assumptions required in physics-math-related problems? Like, you must neglect air resistance because it is a simplifying assumption right? Is this true...

Hi, I will go back to school next year to start studying physics. For the moment, I am learning/reviewing maths with Khan Academy and the book of Mary Boas. Once I am good with the maths, I will start to review/learn physics (Khan Academy, Fundamental of Physics by Halliday and Resnick...

Hello, i am not an expert in physics (i am a computer scientist) but i have a lot of interest in physics, still there are some questions that i can't seem to answer given my limited amount of knowledge in physics (i had only 1 classical mechanics subject in university, although i try to learn a...

Hi, I am going into physics 12 and my teachers homework is nothing like the test. the homework is easy and the test are hard. Does anyone of you guys know websites where i can find challenging problems for physics 12. (Kinematics, Dynamics, Work and energy..?)

Homework Statement (c) This coin is placed flat on the same ramp (incline of 50.0o to the horizontal) and released from rest. How fast is the coin moving after the same distance down the ramp (30.0 cm) if the coefficient of kinetic friction is 0.75? Homework Equations The Attempt at...

Hi, I'm completely lost in this discipline. Does anyone know of a good book with solved exercises and some examples, particularly on the 3 types of ensembles (microcanonical, canonical and large canonical), quantum mechanics statistical physics, and fermions/bosons gases? Thank you.

"Extreme situations" in physics problems I don't know if this question is pertinent for this discussion forum. I was making some study notes, and i was trying to recollect statements that are always "extreme" in physics problems (such as mechanics). Until now, i have found two of them: Lose...

Homework Statement Homework Equations - Charge conservation - Equipotential surfacesThe Attempt at a Solution Let Q1 be the amount of charge on the inner sphere with radius c, and Q2 be the amount of charge on the outer sphere with radius b. Using Gauss's law, I figured out that Q1=+2Q and...

hello all ! my teacher told me to do a research on examples of problems that has connection with green function on solving differential equations (with programmed numerical solutions) in my final year project , can you give me such problems to work on as an undergraduate ? , thank you !

Homework Statement The electric potential difference between two parallel metal plates is delta V. The plates are separated by a distance of 3 .0 mm and the electric field between the plats is E = 250 V / m. Calculate delta V Homework Equations E = - delta V / delta D The Attempt...

i have some physics problems, please help me, thanks! Question 1: Question 2: Question 3:

The "Classic" Physics Problems. In my physics education/career I have often heard people refer to the "classic" such and such a problem or to the "typical" or "archetypal" physics problems. These are the problems/models that many/most university physics problems seem to reduce down to, no...

Seems like it might be easier to just cut out the middlemen who hold the dollars and do a bunch of math somewhere until there are a few less "unsolved problems in mathematics" on wikipedia. What's stopping scientists from doing this? Much more efficient in terms of physicist-life-hours.

Algebra mistake? The answer is11.8ohm for (a). Thank you!

Before I go about trying to futilly solve the question, is this thing beyond a CIE A-Lv physics student's reach or not? Any comments on the difficulty of the question, and perhaps the reading material which you would recommend before I attempt the question? Thank you.

Homework Statement The problem is attached Homework Equations P=F/A The Attempt at a Solution I did the question like this (got wrong answer though): Surface area of sphere=4∏r2=4×∏×0.252 Atmospheric pressure=1.01×105 Force=1.01×105×4×∏×0.252≈80000N Actual answer 20000N...