Physics Definition and 987 Threads

Hello. Thanks for having me. I'm Paul, from the UK. I'm interested in physics, and maths, and science generally, but mainly physics, and within that mainly cosmology. I'm maybe around GCSE level regards maths and physics, roughly high school diploma level in the US, according to Google, although...

I never stop learning physics, especially astrohysics and cosmology.

Hi, unfortunately, I am not sure if I have calculated the task a correctly. I calculated the eigenvalues with the usual formula ##\vec{0}=(H-\lambda I) \psi## and got the following results $$\lambda_1=E_1=-\sqrt{B^2+\nabla^2}$$ $$\lambda_2=E_2=\sqrt{B^2+\nabla^2}$$ I'm just not sure about...

Hi guys, I am a first year IB student who has to pick his EE topic. The Extended Essay is an independent, in-depth study of a chosen topic within one of the IB subject areas. I chose to do mine on physics. I have to write 3500 - 4000 words for my EE. I've chosen a set up for an investigation /...

I am an Indian and even though my English knowledge is somewhat better than that of an average Indian, there isn't a day I try to real highly technical books and fail to understand it at the first glance (or don't understand it at all). I understand why they use language which might seem...

For this, Can a the equation ##x = vt + x_0## not be considered a direct proportionality between ##x## and ##v##? If so, is it because there is a constant ##x_0##? Many thanks!

seeking help for clear concept

I was studying for a Physics Masters Entrance Exams (India) and my coaching institute basically suggested me these books: I actually have regretted buying books without prior research in the past, so I am making sure I do my fair share of research before buying any of these or something...

I was trying to learn physics from a coaching institute and they started optics before they started Electricity and Magnetism and the lecturer went on saying somethings which I didn't completely understand. Is the coaching institute doing it wrong teaching me Optics before they taught me...

In 12th and considering a career in research. Ik most of the collages ( IIT Kanpur, IISc Bangalore, IISERs etc ) but I am not sure of the research possibilities provided so if anyone can help out please do

1)The atmosphere is an extremely complex system, so much so that weather forecasts beyond a few days are not possible. Why are seasonal or 10-20 year climatological forecasts reliable? I heard from a climatologist in a video on YB (I know it is not a valid source) that weather forecasts are an...

Greetings, I am here to "brush up" on my general physics knowledge and more as a life long learner. My background is in biochemistry, but I believe in being well rounded as a scientist, a student and a educator.

Vixra.org? Forgive my ignorance but never heard of that. Until someone mentioned the name in a thread here. I quickly checked a number of abstracts; no author’s title, no affiliated institution. Recipe for avoiding it.

I've inserted a photo of the figure, hope everyone can see it. SOLUTION: 1. I first solved for the angle of 100 N and 50 N since I need the force that is perpendicular to point A. >> Angle of 100 N theta = arctan(3/4) theta = 36.870 degree >> Angle of 50 N...

I have learned a lot from you and I am now proud to be a member of Physics Forums.

For this, Can someone please tell me what tolerance means in this context? Many thanks!

I have tried to subtract the two values of y for the minimum intensities to find half the wavelength but I am really stuck. Any help would be appreciated thanks

Hi, My name is Brandy and I am a biology major and a sophomore taking intro to physics this summer! i am excited to get to know the community.

I am 38 years old, I have a B.S. in Mechanical Engineering from SJSU, I have an M.S. in Adavanced Technology (from my home country) I will be done with my PhD in Nanoscience and Nanotechnology (from my home country) in one month and I will start aN M.S. in Physics at SJSU this Fall. Even...

For this part(a), Why do they give 2 sig figs in the solution? ##80 kg## and ## 10 m/s## both have 1 sig fig. Thank you for your help!

Question picture: My solution: Where: S is the lineforce Ff is the force as a result of friction a is the resulting acceleration F is the acting force The answear is supposed to be a=(F-2mg(mu))/(m+M) Any idea what i could have missed? Thanks for your help on beforehand!

Problem: Attempt at solution: So "energy passing through per unit area per unit time" is equal to $$I = \frac{E_i}{A t}$$ So for a the graph will be in the form of ##y=1/x##? For b) do we have to solve the differential equation $$dI = \frac{E_i}{A dt}$$?

Hey! This is Jasmine Masown here. A curious learner, book lover and a science buff. I've been passionate about science and how things in our universe work ever since I was a Lil kid. Hopefully carrying that love for science forward in the form of formal education (physics undergrad). Thank you...

I am aware that this question is very simple and basic. Using ##y(t)=y_0+v_{0,y}t-\frac {1}{2}gt^2## we can find distance as a function of time: ##|y_1-y_2|=|y_0+v_{0,y}t|=-y_0- v_{0,y}t## I assumed the downward direction to be negative. So as I wrote ##D(t)=-y_0- v_{0,y}t##. It tells that the...

Good Morning (And apologies if this is not the right forum -- it is not a homework problem.) On the one hand, a vector is an arrow and a tail: it has magnitude and direction. It is used to describe direction, forces, acceleration, etc. However, there are more mathematical definitions: a...

I asked Bard that question and it responded (among other things) that a) globular clusters are spherical and b) that they are spinning rapidly. Aren't those two things contradictory, as in they should be flattened by centrifugal forces?

For this, Can someone please tell me why they integrate the impulse over from ##t_i## to ##t_f##? Why not from ##j_i## to ##j_f##? It seems strange integrating impulse with respect to time. Many thanks!

I’m physics curious and a middle school science teacher. I was wondering about time dilation on day side of Earth vs. night side. Pervect gave an interesting response on the subject in 2005, complete with link. The link doesn’t work and I cannot find the paper on OpenSky. I’m hoping someone can...

I was looking at this video, and have become quite interested:

Energy lost by water = Energy gained by ice Energy lost by water = 0.16 x 4200 x (100-t) Energy gained by ice = 0.205 x L + 0.205 x (t) (where t is the temperature at thermal equilibrium). However, there does not appear to be enough info to continue. The solution, however, considered t to be...

I'm trying to understand sports physics and I have a question about an exercise we do at my taekwondo studio. For the line drills, we do something called the frog jump where you jump forward as much as you can with both legs. Everyone swings their arms forward to gain momentum. What does this...

TL;DR Summary: I need animations to understand physics better. Any links and animations would be very appreciated. I have started learning Solid state physics and I am struggling somewhat to understand and imagine certain things. I feel like this is one area of physics which needs extensive...

I ask for help in interpreting this question. Thank you !

How did you find PF?: Google Search I'm new to this forum and I am currently 14 years old. I've recently taken an interest in physics(Due to popular science/ books and natural curiosity). But I have no idea what path to take so I could study it. I come from a poor and quite unsupportive family...

In interpretations of quantum mechanics there are two types of physicists: those who care about ontology and those who don't. The ontologists, or realists, want to know what is the world made of. The non-realists, on the other hand, think that this question is not relevant to physics. Usually...

Interested in possibly chatting to like minded individuals.

I initially tried to solve this equation using work, but was stuck in a confusing integral that didn't make sense. I am almost sure that the utilization of energy is needed to solve this equation, but I have been flustered for the past three days at solving this.

For this problem, The solution is, Does someone please know why ##N > 0##. I though at the min speed to still go around the loop, we could set ##N = 0## and ##mg## provides the centripetal force. Also, I am wondering how to do this problem with using energy conservation. My working is ## N +...

If you have 2 pipes of the same cross sectional area, same volume of fluid, and same length, the only difference is one pipe is coiled several times over a cylindrical object theoretically shortening the length of the pipe, while the other is a straight pipe. Will the flow rate be same in both...

For this problem, The solution is, However, I thought the answer would be (b) and (e). I choose (b) because from the formula ##P = \frac{F}{A}## then since the vessel A has more water, then the water will have a larger weight ##W_A > W_C > W_B##, therefore from##P = \frac{mg}{A}## we conclude...

I found 3 papers on The Exceptional Jordan Algebra in physics arXiv:2305.00668 (hep-ph) [Submitted on 1 May 2023] CKM matrix parameters from an algebra Aditya Ankur Patel, Tejinder P. Singh Download PDF We report a theoretical derivation of the Cabibbo-Kobayashi-Maskawa (CKM) matrix...

After a long time, I think I want to go back to school. I want to go to an online college. So here are my questions What is the most highly recommended college? (Preferably one with relativity, quantum mechanics, and field theory) What kind of tuition and course prices should I expect? I...

Here's an applied everyday life physics question based on a MVA (motor-vehicle accident) I was involved in a few weeks ago. I was driving straight when a women hit me from the driver side (said she didn't see me due to being in her blind spot - her claim, not mine, as I don't know if I was or...

I'm guessing this question can be solved using the law of conservation of momentum Vi = 5 m/s (5 m/s) M = (4.33 m/s) cos30 M + V sinθ M I don't know what to do after this... I'm also not sure if I use the sin and cos correctly.

I have done master's in physics and I am not sure if I should also do PHD in physics or not. Can anyone help me out here and highlight the career opportunities there could be after PHD.

Hi everyone. I'm currently a 3rd year quantitative/mathematical/cognitive psychology graduate student in a PhD program finishing my masters after this semester. In it, I'm using the mathematics of quantum mechanics to model cognitive phenomena. I was accepted into a physics PhD program as an...

Hi,I want to major in Technological Physics. What opportunities are there with this field? The only thing that comes in my mind is teaching physics. Can you get a job as a physics engineer ? In my country this job is nonexistent and I have no idea what to search. I don't live in the USA,I live...