Physics Definition and 987 Threads

Putting the questionable nature of my professor's problem-writing aside, I found this question pretty confusing. I assumed that 60 m was the focal length, and that R1 was infinity since it is a flat surface. This gives me: 1/60 = (1.5 - 1)[(1/∞) - (1/R2)] This gave me R2 = 30 m, but that isn't...

My name is Les and in 1977 I began studying Physics at Texas A&M university, After four years, I decided a career in Physics was not for me. Since then Ihave been working as an Engineer.

This is a spin-off of a similar problem posted here in which the cylinder gathers snow as it rolls down an incline. I think one has to understand the snow-gathering process before attempting the more complicated case. A horizontal surface makes that easy but because it is a different problem, I...

hello! my name is Mohammad Sameer from India. Pursuing five years integrated masters in physics, will be starting my second year in couple of days. Interested in quantum theory of classical entities and want to explore more in the domain.

This is a response to a recent insight article regarding the twin paradox. The idea is to model the most basic scenario in a way, that the paradox disappears. This basic scenario and its kinematic effects are then modeled using only a straightedge and a compass. The best way to read this post...

Hi, My name is Albert, and I'm here to learn and share knowledge and experiences throughout my journey in physics and human sciences.

i have just started on relativity, so be simple. you are going to travel 1 lightyear at half the speed of light. therefore, it would take 2 years to travel 1 lightyear. on Earth, you would see me going half the speed of light, so it should take two years as well? i calculated gamma as being...

Something I have been thinking about and don't really have a good answer to. For context, let's take physics and engineering for example. From my understanding, a very rough definition of physics would be the study of naturally occurring physical phenomena and understanding how they work...

I'm supposed to enter a valid message so here we go. I'm a girl obv and very much interested in physics. Found this platform on google and thought it might help me quench my thirst of ever growing curiosities. Yea, that's it pretty much

I'm a retired physics teacher who taught physics and AP physics for maybe 40 years. I saved my problem sheets and tests. If you are a beginning (or experienced) teacher and need pre-made problems and tests I'll send you mine. I'll wait a few months for a reply, then to the dumpster they go...

Is there a category to ask physics questions based on very little information? Namely a YouTube video that discusses a topic in a way that confuses me that I merely want clarification on?

I need one since im about to enter university next year and i didn't have so much physics in HS so i might need a bit of help

Math grad, crazy about physics!!

HI, I am an International Student studying in the US (at a "liberal arts" small college ranked in the Top 20 as per US News Rankings). I will graduate in 2024 and intend to apply for PhD programs in Mathematical Physics starting October 2023 for admission in 2024. GPA: I am a double major in...

Consider an object which is constituted of two different materials, which are inseparably mixed together, but which have different magnitude of masses. To calculate the gravitational force of the object upon another object, can the superposition principle be applied to the two constituent...

I apologize for messy title, but that's as short as I could make it to say all that I wanted. I also apologize if I'm not using correct math phrases, but I'll try to picture a problem the best I can. I've been pulling my hair out trying to solve a problem I'm having for couple of months. The...

Hello! I'm from Croatia and one of my pass time obsessions is game physics, especially ragdolls, and any game that lets me play with that is a game for me. I did some mods for games like Fallout New Vegas which modify how physical objects in game work which seem to be popular. Anyway, I hope...

I’m Jessica, a (nearly) 25 year old trans woman from the UK. I studied Physics and Astrophysics at university before dropping out. I dropped out for mental health reasons which were later diagnosed as Gender Dysphoria. After a few years away, I have now begun tutoring Physics to a friend in...

I have bachelors degree in electric engineering and masters in engineering management and 14 years of experience in software product development. So no experience in physics at all. Is it possible to do a phd in physics ? Its always been my passion that i now think about pursuing

The following is more of an interesting example and observation than a question that I am presenting for public comment. It's somewhat related to a recently thread, which was closed for moderation, but I think it's different enough not to fall under the ban of reposting threads that have been...

I was given two HW questions, I was supposed to solve on using ##<\vec{a}> = \frac{\vec{V}_f - \vec{V}_i}{\delta t}## and another using ##<f(x)> = \frac{\int_{x_1}^{x_2}f(x)dx}{x_2 - x_1}##, I was able to solve using the first formula but I wasn't able to do it with second (at least I got the...

Non-perturbative methods are critical in parts of quantum field theory, such as QCD, and have at least some applications in quantum electrodynamics. You can also have mathematical problems that don't have perturbative solutions. But, it isn't clear to me if classical physics can ever have...

Homework Statement: A door opened at 75 degrees from the latch remains at rest. When moved to a position 60 degrees from the latch, it slowly closes on its own. Is there another possible cause besides a sloping floor? Relevant Equations: \tau = r x F; v = \omega x r; a_T = \alpha x r, where...

I'm asking about this with particular reference to the signs of the answers. Here is the question: The answers in the back of the book are: (a) ##1.2 \times 10^4 \text{ N}## (b) ##39 \text{ m}## (c) ##4.7 \times 10^5 \text{ J}## (d) ##4.7 \times 10^5 \text{ J}## Here's a rough sketch of...

I am planning to take undergrad physics but I am concerned about the pay scale of physicists. Since I am the leader of my family (after my father), I will be financially supporting my family soon as my father retires (we have a family system). I also will have my wife and children. The reason I...

Hi, unfortunately, I have problems with the following task I tried the fast way, unfortunately I have problems with it I have already proved the following properties, ##\bigl< f,xg \bigr>=\bigl< xf,g \bigr>## and ##\bigl< f, \frac{d}{dx}g \bigr>=-\overline{f(0)} g(0)+\bigl< f,g...

TL;DR Summary: I am doing an experiment for my Physics IA and don't know the theory behind it I am working on a Physics experiment for my school where I vary the distance between a simple pendulum and an aluminium block, and get the damping coefficient for each distance. Below are the images...

My understanding of certain topics in physics has been flawed so now trying to learn it all over again. The internet is a fantastic place to relearn misunderstood concepts.

Hello everyone, I graduated a few years ago with a bachelors in aerospace engineering with a 3.2 GPA and a second author on a published research paper. I am currently working as a senior software engineer, but have been considering going back to school for a PhD in Physics. I am planning on...

I was able to solve part 1 but I am not not getting how to find new amplitude of the motion . Please help me

I'm not sure. A source said New Velocity = Current Velocity - TerminalVelocity every second until New Velocity = TerminalVelocity But it doesn't seem right

Homework Statement: . Relevant Equations: . How do I write equations and symbols in the homework statement and relevant equations sections?

A layperson who often bumps into tricky physics questions which require somebody who knows more than me.

to discuss the basic physics and review the law of physics from different angle.

Hello, everyone, I have a BSc in physics with a GPA of 3.6 in a 4.0 system. After my BSc, I was working in my country for about 2 years at a research institute, and at that time I didn't truly understand what is research and what I should specialize furthermore in physics, etc. Now, I'm...

For me, Event Horizon was very scary but had enough sci-fi and sci-real to it that it captivated me.

TL;DR Summary: help with math for physics undergraduate degree - advice needed Hello! I'm studying physics for my undergraduate degree. I have a question, and if anyone can help I'd truly appreciate it. I have problems with the math part. I love physics (concepts, research, findings) but i do...

I remember taking Physics in high school, so I guess it is possible, but it's been so long ago, I can't remember. It just seems that Calculus is indispensable when teaching Physics topics, except for a few like heat expansion or geometric optics. I would imagine that there is a lot of Δ this &...

I think that's it. I'm glad I can be part of this forum.

Curious. That's all.

Hello everyone, I am a Physics Masters student in USA (international student). I have completed a semester so far. Currently, I am working on a project under cosmology, which is related to Fischer analysis. Background: I have graduated with a BSc Mathematics with a physics minor. While...

Hi everyone, I am a Physics Masters student in USA. Just joined the forum to learn more about physics and whats new in the community and also looking for some career advice as needed.

I'm confused because torque increases with increasing moment of inertia (MOI) but angular velocity decreases with increased MOI because of conservation of angular momentum so angular acceleration would also decrease. And then power is the product of torque and angular velocity so with a smaller...

Hi everyone, looking forward to meeting people how like to think about physics and discuss, solve problems!

I am studying Physics to get into a University to study masters in India. But, I do realize how vital a role mathematics plays and I am studying Mathematical Methods for Physical Sciences by Mary L Boas for that. I have some background in Physics, I did study Physics in high school and...

TL;DR Summary: I have heard detailed description of what to do when you study physics, but I don't know how to learn Physics in the first place, so this post tries to counter that. Here's How to Teach Yourself Physics and Math [Futurism] How To Self-Learn Physics: The Ultimate Guide How to...

I will start an M.S. in Physics this fall at SJSU. If I apply to a PhD program in Physics once I am done with the M.S., will they consider the fact that I already have a PhD in Nanoscience and Nanotechnology, my age (38 years old now) and my immigration status (international student) for...

I haven't taken a math course since 2007 and never went past algebra 2 trigonometry