Concepts Definition and 412 Threads

Hello! Using concepts of physics 1 like kinamatics, dynamics, circular motion, pressure, newton's laws. Make me a physics question that needs basic calculus like integrals and derivaties to solve!

but at the same time give true essence of fundamental quantities i.e. what truely is heat? I have read couple of books where each book gives definition of quantities but not its essence.

When I learn a concept, I often find that to understand it, I have to learn some other concepts and I don't know if they also require learning new concepts. During this procedure, I find learning frustrating, as the teacher always presume that I should have learned them. So I think I can build...

What is the need to introduce the concept of work and energy when the motion can be completely understood by the concept of force and acceleration and momentum and velocity and displacement, etc? Why do we need to understand the same thing once again in terms of Work and energy? Also the kinetic...

I'm going to give my best attempt to word my thoughts the best I can. As a subject I don't personally know a lot about but am heavily curious about with lots of questions, what would be keeping our known universe from colliding/merging with an unknown universe(s) following the inflation theory...

We have a material of dielectric constant (or relative permittivity) k=##\epsilon_r##. I place it in an external uniform electric field pointing down ##E_0(-\hat z)##. Induced charges and net field There will be charges induced on the near and far surfaces normal to the field (top one...

I was reading Shape and Flow: The Fluid Dynamics of Drag by Shapiro and wanted to see the movies described by the book. There is a whole series of fluid dynamics movies at http://web.mit.edu/hml/ncfmf.html Of course, they pale in comparison to my favorite educational movie which is about...

Hi guys, Hopefully, no geometry-enthusiasts are going to read these next few lines, but if that's the case, be lenient :) I have always hated high-school geometry, those basic boring theorems about triangles, polygons, circles, and so on, and I have always "skipped" such classes, studying...

The options are rank(B)+null(B)=n tr(ABA^{−1})=tr(B) det(AB)=det(A)det(B) I'm thinking that since it's invertible, I would focus on the determinant =/= 0. I believe the first option is out, because null (B) would be 0 which won't be helpful. The second option makes the point that AA^{−1} is I...

Im very new to the terminologies of isometric basis and musical isomorphism, will appreciate a lot if someone could explain this for me in a simple way for a guy with limited experience in this field. The concrete problem I want to figure out is this: Given: Let ##v_1 = (1,0,0) , v_2 = (1,1,0)...

I am confused with the concept of Torque handled differently in books, Concept1: If a loop is placed in a magnetic field and the current flowing in the loop is ##I## there will be force and torque acting on the loop given by ##F = I \vec l \times \vec B ##. The torque is given by ##\tau =\vec...

We were told that incomplete dominance occurs when in heterozygous condition one of the allele is less efficient and another is normal/wild type/unmodified. Co-dominanace occurs when in heterozygous condition both the alleles produce normal functioning enzyme but both the alleles produces...

(sorry i post this here now because i didn't know about this sub forum earlier) I came across an interesting paper from which I'll quote parts of the intro: and the conclusion: obviously the authors are more competent in Physics than I am - so are most PF member. what are your opinions on...

I came across an interesting paper from which I'll quote parts of the intro: and the conclusion: obviously the authors are more competent in Physics than I am - so are most PF member. what are your opinions on this? can the work of these authors "discover" physical laws in any way or is the...

Hey, first post here. So I have to classify these 6 elements under closed-loop/open-loop system and under CO2 removal/oxygen supply. I thought it should be: Closed-loop CO2 removal: Rapid cycling anime, Lithium granules Closed-loop oxygen supply: Water electrolysis, Cryogenic tanks Open-loop CO2...

Sometimes I run into this claim But what are some examples? Is it perhaps the discovery of binary numbers and then their much later application to computers? Or what about this?

In Jackson, (3rd edition p. 545), there are equations they are given as, $$A = e^L $$ $$det A = det(e^L) = e^{Tr L}$$ $$g\widetilde{A}g = A^{-1} $$ $$ A = e^L , g\widetilde{A}g = e^{{g\widetilde{L}g}} , A^{-1} = e^{-L}$$ $$ g\widetilde{L}g = -L $$ I have several doubts. 1) $$det(e^L) =...

I'm kind of a late boomer when it comes to math, or maybe liking math... Anyways in junior high(I live in Canada), I found math easy and boring and I ace the class without ever listening in class or doing any homework and I continued that habit in my first year of high school which ended...

The paper https://www.whitman.edu/Documents/Academics/Mathematics/klipfel.pdf (beginning page 2``1) describes a model for experiments based (it says) on the book An Introduction To Hilbert Space and Quantum Logic https://www.amazon.com/gp/product/1461388430/?tag=pfamazon01-20. This approach...

Im looking for a book that gives descriptions and explanations of physics concepts instead of a equational representations. Or A book that focuses mostly on concepts with minimal equations. I have come across Richard F. Lectures that are red textbooks and I am looking for other alternatives...

For me it is their behavior. How it is different from humanity. Some will seek to answer the why, but I am only interested in their ongoing goals. To a large degree that fits their behavior, since in my work, each fictional race I tailor made for a specific purpose which drives them to do what...

Question.

How much essential is it to learn concepts such as - different types of transport of vectors, like Fermi Walker and Parallel transport; - different frames (basis vectors); - tensor densities and integrations To put it another way, do they play a important role in the theory? If one for some...

We have some people trying to report four places to the right of the decimal with inputs that rounded to 2 and 3 decimal places. Can you please articulate why it is impossible to guarantee four decimal precision? I have been unsuccessful in my attempts and am looking for help from someone with a...

Okay, I am confused about work and what it is. I know the formula, W=FDCos(theta), so putting it in math terms doesn't help. I am trying to get a layman's/physical understanding of it. Everything I read says it is equal to energy, so then I think it must be energy right, has same units? But...

I'm having trouble wrapping my head around some thermodynamics and ideal gas law concepts. I don't have a specific textbook question but Just a concept I'm having trouble with. What I'm struggling with is understanding some of the relations between pressure, volume and temperature...

I'm finishing up physics 2(intro E&M) at my college, and I'd like to apply the concepts I learned in it over the summer. I was considering working through an electronics book, or building a radio, etc. What kind of projects or books do you recommend to cement some of the topics I learned in a...

In a https://jila.colorado.edu/thompson/sites/default/files/pdf/PhysRevLett.113.154101_0.pdf on quantum synchronization, they introduce the setup given in the attached 'Fig1.png'. I would like confirm a few concepts regarding this setup. The setup is described in the following way: The general...

Hi all, I have an issue with understanding the following passage in the aforementioned book. I have uploaded the relevant passage as an image below. Any assistance is greatly appreciated! The paragraph under equation (22.57) says that the total Helmholtz function ##F## is a sum of Helmholtz...

Hi friends, I'm just thinking, in some video games, the characters have a double jump mechanical. What's the physics concepts behind this? I mean, it's really possible explain it? I saw a brazilian video about science in games in which the author talks about air resistance. It's a curious...

Hello! Thanks for your time reading my questions. When I was studying quantum statistical mechanics, I get so confused about the relations between Pauli's exclusion principle and the Fermi-Dirac distributions. 1. The Pauli's exclusion principle says that: Two fermions can't occupy the same...

Homework Statement A box of mass X kg hangs motionless from two ropes, as shown in the diagram. The angle of rope 1 is specified amount of degrees. Choose the box as the system. The x-axis runs to the right, the y-axis runs up, and the z-axis is out of the page. What is the magnitude of |F2|...

I’m not sure what’s up but I find myself over complicating concepts that are new and ones that I was really good with and have been practicing for the last like 3 years. I find myself trying to connect things to previous concepts but it isn’t working out. I’m in second year but I’ve found...

I have a project for my physics class that revolves around the idea of building a working pneumatic tube system. I understand how I would build it and such but my teacher wants me to explain the theory behind it. Does anyone have any ideas about the physics behind this or the principles, rules...

What is the best site to learn physics concepts with lots of examples? some site which doesn't show up on google. Like i give example of cplusplus.com which has all topics of c++ programs. Is there some physics site like that? Like i am always confused with pulley,strings, tension problems.

Has anyone ever uh forgotten physics concepts? I'm kinda panicking right now because last term during the mechanics part of my 1st year physics course, there were concepts I KNOW I understood - like circular orbits of satellites or angular motion but yesterday I was trying to explain orbital...

Greg Bernhardt submitted a new PF Insights post Intro to Big Bang and Infinity Concepts Continue reading the Original PF Insights Post.

What concepts should be cleared to better understand quantum tunneling?.

I was just wondering if there are any resources on mathematics and physics that explain the origins of the concepts. I am not currently in college right now but I absolutely love physics and quantum mechanics. I am trying to understand the nature of reality because it is so fascinating. I'm...

Before I begin learning what System Calls, Kernel, and Operating System is, I want to confirm that Operating System concepts like Multi-threading, Concurrency, Parallelism, Scheduling, Memory Management, Process Management, Network Management, Device Drivers can be implemented by using Linux...

I hope to one day help engineering students by having a wealth of videos that cover the "weed-out" courses (in the first two years of engineering curriculum). Does anyone have any suggestions on how I can make these videos be the best that they can be? I plan to do narrated powerpoints, but I...

Hi Problem: Three loads are connected in parallel across a 12.47 kV three-phase supply. Load 1: Inductive load, 60 kW and 660 kvar. Load 2: Capacitive load, 240 kW at 0.8 power factor. Load 3: Resistive load of 60 kW. (a) Find the total complex power, power factor, and the supply current. (b) A...

Hi all, I'd like some assistance regarding some issues I have understanding such states. (Referencing Griffiths' QM) 1) Meaning of Bound and Scattering States. The bound states I have studied thus far are limited to the infinite square well and the quantum harmonic oscillator. In the case of a...

I'm planning to make free Illustrations on physics concepts(as many as possible) for instructors' use. I m not sure if i design it for printing or presentations. Feel free to make any kind of suggestions. https://www.physicsforums.com/attachments/211203

I started this thread because I was much confused by the post https://www.physicsforums.com/threads/first-energy-or-mass.923809/page-2#post-5831139 in a thread which was closed before I could seek clarification there. I am hopeful that @PeterDonis, and/or others, will help me here. Peter...

Hi everybody, Consider the situation illustrated in the attached figure . A large water tank at elevation z1 is connected to a penstock with diameter D and outlet at elevation z2. The flow in the penstock is Q. The outlet of the pipe is connected to a valve and nozzle that direct a jet of water...

If a capacitor is charged to 10V where the negative side is connected to ground (0V), when the capacitor is disconnected from the power supply on both the positive and negative sides; 1) Will the negative side of the capacitor still be 0V relative to the ground it was just connected to? 2) Say...

Doubts regarding the law of reciprocal proportions: What i have understood by reading the definition is that the ratio of the masses in which two elements A and B combine with a fixed mass of a third element C, will be a whole number multiple of the ratio of the masses in which A and B combine...