Physics Definition and 985 Threads

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...

I have read online that the optimal amount of time to study for is 30 minutes followed by a 10 minute break and repeat. Dose anybody else please know of a good study schedule? Many thanks!

with scholarships making the costs relatively the same, which college would you choose for physics major - rutgers, stonybrook or rensselaer? bs in physics, not engineering. don't want to choose research interest area just yet but likely interested in grad school more than industry right after...

TL;DR Summary: Imagine you have infinite funds and cooperation to build a very ideal curriculum and student organization, both dedicated to quantum information science, at a university. What does this look like pedagogically? How would this be structured? What resources do students need access...

Hello all: Watching few news , titanic came and we start to have a question , can I prove that titanic was sunk because of hitting an ice mountain, and not because of torpedo, should we use material specifications , speed of the ship , and material specifications of the ice mountain or we...

Hi it's my first post here! I'm in my second year of my degree and looking to replace my computer. The new M-series chips seem like a better deal, however I am nervous that some software that might not be compatible with the ARM architecture. For more context on my workflow I do quite a bit of...

I am interested in pursuing graduate reserch in physics. I have undergraduate and graduate degrees in engineering with a research in classical mechanics. However, PhD programs require a background in modern physics in order to be accepted and I would prefer to strengthen my preparation in...

hello I am interested in computational physics at an amateur level is it worth while learning complex numerical methods with C++ /Python to solve partial differential equations as well as for other physical applications while a software such as mathematica can do the job for you ?

I'm a physics undergraduate student. Im gonna try to tell you the short version of my story. I used to be in a different science field, but always wanted to pursue physics. The reason I didn't do so at the start is because my parents were opposed to the idea (i was 17 and didn't argue much at...

I want to know how hard is to get a Master's in Physics from SJSU. I am not a Physics major and I want to know if by attending this program will I be able to do other personal activities or is it likw I will just be studying all the time.

In this popular science article [1], they say that if our universe resulted to be non-uniform (that is highly anisotropic and inhomogeneous) then the fundamental laws of physics could change from place to place in the entire universe. And according to this paper [2] anisotropy in spacetime could...

First of all, the pulling force is 300N cos(30) = 260 N At this point, I try to find the friction force Fn = mg = 20kg * 9.81 m/s^2 = 196.2 N Then, Ff = μ * Fn = 0.5 * 196.2 N = 98.1 N So after canceling the horizontal forces, 260N - 98.1N = 161.9N And the acceleration will be 161.9N / 20kg =...

Hey everyone. Let's say you have a tall tree. say, 10 m tall. Take a cubic cell 1mm in dimensions. Suppose the cell is at 1 m high in the center of the trunk of the tree. What are the forces acting on the cell? let's say tree cell's mass is t grams. its weight is F= ma = t (9.8) = 9.8 t...

I'm a diving coach at the local YMCA and I want to give a lesson regarding the physics of diving off the board with maximum efficiency. This is the type of diving board with an adjustable fulcrum, basically a lever with one end fixed with bolts. Its been almost 15 years since I've taken a...

Maybe it is my present circle but I see a lot of students pursuing Astrophysics and related domains in terms of projects, Master's Degree etc. and I wonder what are the reasons for the same. Is the field extremely "hot" or is it just saturation caused by excessive Pop Sci influence? Full...

Hey all, Long time forum lurker here. There's a lot on my mind, but I will do my best to keep it concise: I'm an undergrad chemical engineering student, just starting my junior year. I have found myself at somewhat of a crossroads concerning my career pathway: Originally, my plan was to finish...

Out of curiosity, how fast are the hands of the pros? I have timed an exchange between BJ/ALW and JD/JI that occurred at the Baird PPA in September 2022. The ball made the (about) 14 foot trip 11 times over 4.0 seconds, for an average trip time of 363mS (milliseconds). (Average speed of 26.3...

Hi, I am 25 years old living in EU. I am posting my experience with the objective of getting advice or opinions. I have a bachelor in physics with a thesis on the SM electroweak sector. I have a master again in theoretical physics with a specialization on Hadron Physics ( QFT ). Both of my...

Hi There! I am quite a beginner at physics and my aim is to apply physics to a computer program which I'm coding. The program consists of 2 balls of equal mass colliding into each other and demonstrating the trajectories after an elastic collision. I have already coded a more basic model...

Hello, I'm currently a phd candidate in pure maths, doing research in Ergodic Theory (concerning ergodic convergence theorems). When I started studying Ergodic Theory I ran into Statistical Mechanics and I immediately fell in love. I've started studying physics from scratch. As my current...