Physics Definition and 987 Threads

Hi everyone:oldsmile: I'm a third year physics student in Birzeit University, recently knew about PF, hoping this website can help me deepen more in the world of physics, also to dig in the computer science thing. I work at the observatory in my University as a member in it ( I present lectures...

Diagram Integrate pressure for each particle: Add normal force and weight Sum all the forces in the x and y direction to get:

What would be the ideal wavelength and power of a laser to kill an insect on human skin without burning the skin ?

I’ve heard at least a million times that you need to understand physics, but never actually understood in which way? When I study, I understand what the textbook says and how to apply it. But questioning why is it the way it is, usually confuses me and many times leaves me uncertain, I doubt it...

TL;DR Summary: how can I calculate the acceleration of a bike whilst using phyphox? Calling all physics lovers who are willing to lend a hand, Hello, I’m busy doing a physics project on the friction force on different surfaces, like asphalt, grass, etc. I need to measure the data using an app...

I was reading this article https://www.technologyreview.com/2024/05/15/1092535/a-wave-of-retractions-is-shaking-physics/ Are the numbers actually up? I am not saying that processes cannot be improved.

Hello everyone. Today I registered. I hope to share good times and learn interesting things. I live in Argentina, far from the main centers of scientific activity. It is a great experience to frequent Physycs Forums. Kind regards.

Hello to all, New to the forum, I'm not trained in the science of physics. I typically get focused on a singular topic (not unlike the fictional Columbo character), conduct experiments then attempt to compose organized questions and really appreciate the more knowledgeable who are willing to...

TL;DR Summary: The reason to force us consider complex solution for harmonic motion. Reference textbook “The Physics of Waves” in MIT website: https://ocw.mit.edu/courses/8-03sc-physics-iii-vibrations-and-waves-fall-2016/resources/mit8_03scf16_textbook/ Chapter 1 - Section 1.3 (see attached...

I was very fortunate to get into both Cornell (with the Meinig Scholarship) and Berkeley (with the Regents Scholarship) and have the difficult decision of choosing between the two. While I know Berkeley is known for its engineering and physics programs, Cornell is apparently strong in that field...

Hello! I've looked around the community, and this seems like a great place to ask the question to experienced professionals! I was wondering what kind of life does such a career in physics entail? I'm trying to contemplate a career in academia, but I'm quite nervous on the career switch, hehe...

<Mentor’s note: this thread is closed as a duplicate of https://www.physicsforums.com/threads/the-coming-revolution-in-physics-education.954664/ > In the March 2024 issue of Nature Physics 'Computing in Physics Education' (https://www.nature.com/articles/s41567-023-02371-2) we read: "In the...

Hey y'all, Physics major from a UC here. I wanted to see if I could get some brutally honest insight on my chances of admission to the Physics graduate program to schools like Caltech/MIT/Stanford/UChicago to anyone who may be able to provide it. [Current Stats] I'm a second year Physics...

Hello everyone. I am new to this website but not new to physics. I took physics in high school and college, but I did forget a lot of what I learned. I graduated from college with a degree in Electronics Engineering. I graduated in 1997. The areas of physics that I am the most interested in is...

Hello everyone, Always followed physics forum from my high school to read about solutions and interesting discussions on fundamental physics questions. Now in my PhD I am ever more daunted by physics problems in an intriguing way and would once again have fruitful discussions or follow some...

not studying physics but i have some courses that requires a good amount of electorstatics and electromagnetism

I'm trying to brush up on my Calc 1-3, and Physics 1-2. I got up to integration in Thomas' Calculus book no problem. The integration part of it is a bit convoluted to me though. So, I'm trying to find opencourseware that I can look at and go at my own pace through it. I have a few sites, but...

What in physics (or some other topic) would you memorize if you could? Yeah I know memorization doesn't usually have a point, just asking, if you could just do it without effort, what would it be? Or maybe you have done it, in which case, what is it?

Hiya! I spend most of my free time thinking about physics and concepts. I want to strengthen areas where my knowledge is weak as I do not learn or digest information linearly. This presents some problems when trying to digest mathematical concepts or I probably would have felt inclined to study...

Are there any alternatives to tracker for tracking moving objects? Paid or free Most of my issues with tracker are related to working with large files or videos that are long, it is really slow or it just doesn't work

Yes,, I know, it may not be the most obvious route but I had already submitted the subject preference list to the university and there is no way to change it. (Therefore, I beg you to not make me regret my choice, since, there is just no way to revert it) . The math I am going to learn from...

For California Community Colleges the minimum requirement for Physics instructor is: Master's in physics, astronomy or astrophysics OR Bachelor's in physics or astronomy AND Master's or above in engineering, mathematics, meteorology, or geophysics OR the equivalent. If the MS Physics program...

Hi everybody. I am Looking for brief explanation and some practical examples to practice the usage of the term dv/dt in modern applications .

Short introduction. Greetings Physics community looking forward to discussing matter, literally. Intersts and expertise: Astrophysics/Helios Science, Nuclear and Particle Physics, Quantum Physics. Whish yall a great day.

Hi all! I'm currently enrolled in a civil engineering program, and need some advice and recommendations. I've taken Calculus 1 through 3, and am finishing up Elementary Differential Equations this semester. I've taken Physics 1, and received a B. I'm honestly surprised I made it out of that...

15cos25 - 0.25N = ma.

First I calculated the volume of all of the logs... V = 13((pi)(.225)^2(g)) = 3.94 Then wanted the mass of the logs m = density(Volume) density = .6(997) m = 2356 Then calculated buoyant force... Fb = (997)(3.94)(9.8) = 3928 Then set this equal to weight of people and logs 38496 = ((number...

I was looking for videos, or post on how to do a physics home work problem. Ended up finding a similar post on this website. It didn't quite answer my question, but I thought I could post here to figure it out.

I am trying to calculate the size of coolant tank required to feed multiple grinding stations. I have a total of 12 taps all with flow rates of 20L per minute. All taps would operate at the same time. The tank would be open topped and 500mm tall. The tank also requires a dirty side and a...

Hello. I am joining this forum in hopes of expanding my physics knowledge and improving my accuracy in my current AP Physics Class. This class has been awful. I am normally top of my class, including AP Calculus BC, so I have a firm grasp of studying and mathematics. I am hoping to be a...

During my B.S./Physics I largely missed course # 3, which (back then) was entirely based on the Berkeley Physics Series, Volume 3 (Waves), by Dr. Crawford. I would *really* like to retake this course, using this book (even though it apparently is out of style nowadays). Unfortunately, Dr...

I am currently a junior (soon to be senior) undergraduate physics major and decided to join the physics forums because I have already gotten a good amount of help and understanding just by perusing past conversations without an account, and because I know that physics is not a subject easily...

Hi everyone I'm Justina. I'm excited in joining physics forums and I'm high school student who is interested in Quantum mechanics a lot .I used to spend lot of time on knowing Quantum mechanics and i learnt few little things. And this is my first time, joining an online community hope I will...

Hello, I am Derek. Physics has always interested me since childhood. How does the TV work? How the Ceiling Fan work? All these questions have always puzzled in my childhood. To seek these, I have wandered a lot which led me to the physics. Despite being a med student, the love for physics has...

I tend to love watching videos by a yt content creator called "Mentour Pilot" his videos debrief aviation accidents, explains lots of the physics involved and engineering. One of his recent videos had me thinking for a little while now and I would like everyone's opinions. This video is about...

Some time after my PhD I decided to study physics (again) on my own and with my own (maybe bit slow) pace. I do not work in the field, changed to IT but I kept physics as my hobby. The self study really brings me joy, can take it slow, rethink with no rush on terms, exams, etc. Currently, trying...

Fx = 0 = ABcos(a)+BCcos(b)-BDcos(30) Fy = 0 = ABsin(a)+BCsin(b)-BDsin(30) == Fx = 0 = ABcos(a) + 3.2737cos(b) - 3.738 Fy = 0 = ABsin(a) + 3.237sin(b) - 2.158 But i cant find a third equation to use. I've tried a+b = 90 but that produced a number of errors. Thank you. Edit: angle b is the...

I live in the SF Bay Area. I graduated in 2019 with a B.S. in Engineering Physics from UC Berkeley. My college experience began with me failing to actually sign up for orientation, and then contracting tonsillitis which lasted my entire first semester. The combination of these two things...

Hello, I graduated from UC Berkeley's College of Engineering with a degree in Engineering Physics in 2019. I performed extremely poorly academically, made no friends/connections, and have not been employed since then. I will be posting a more detailed post asking for some advice.

I’m a physics major in college looking to get into the nuclear energy field

I have been taught topics in high school circling around Newtonian mechanics and some basics of work and energy, waves, geometric optics, current and circuits and some poor electrostatics and unclear concepts of modern physics. I realize that I have significant weak areas in Physics and I aim...

I hope to have a nice time in the physics forum. I am interested in much about the laws of physics with respect to our daily lives and hope to achieve more and increase my knowledge in physics with the physics forum. Thank you for accepting my registration.

TL;DR Summary: A fluid on a vertically vibrating plate will, upon reaching a certain frequency and acceleration, produce standing waves on its surface. These are called Faraday waves, first described by Michael Faraday in 1831. Faraday waves are still an active area of research today, more than...

for 4kg box: Fx = T m1a=T (4) (2.50) = T 10 = T for 6 kg box: Fx = Fa - T m2a = m2a - T 15 = 15 - T 15-15 = T 0 = T I assumed the tension would be the same for both boxes, they are supposed to be, so what did I do wrong and is the answer 10 or zero?

I am interested in many subjects; history, physics, biology, art... well, just about everything. Why? Because the only truly useless knowledge is the knowledge you don't have. My interest in the sciences mainly derives from three sources: 1) my Dad's ongoing interest, as a layman, in sub-atomic...

I'm an ordinary college student who likes physics, engineering mathematics, and electromagnetism. I'm not sure because it's my first time participating in an overseas forum, not a domestic one, but I look forward to your kind cooperation.

Hi everyone! I stumbled across this forum looking for help on my first year physics homework about ~5 months ago and have been lurking ever since. I really appreciate the nature of these forums in that the answer to a problem is rarely (if ever) explicitly given, but instead people try to poke...

Hi, so this is a lab in which we used an air track at an angle and a glider to gather some data through various trials, ultimately to calculate "g". L_glider = 10.15 cm x (photogate activation point) = 547.5 mm or 54.75 cm x_0 (release point) = 1800.0 mm or 180.00 cm (Δx)_midpoint = | x - x_0 |...

How did you find PF?: Google search I encountered a problem in the equations for Einstein's Special Theory of Relativity back when I was in high school in 1964. With the invention of the internet, I tried to discuss this with scientists in sci.physics.relativity, but most of the responses...

.