Member Definition and 246 Threads

Came across this forum wanted to state first I have no background in physics but have been reading through a lot of these articles and would like to learn more. I just posted a thread on a question I had about materials that passthrough IR. Looking forward to seeing more posts with individuals...

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

There is still time to vote for PF members who made an impact in 2022. Vote for up to 3 members in each category. https://www.physicsforums.com/forums/2022-pf-member-awards.363/

Sum of forces in the y-direction = 0 and downwards is +ve P + Fab,y = 0 P + Fab (4/5) = 0 Fab = -1.25P ẟ = FL/AE -> ẟab = FabLab/AabE ẟab = (-1.25P*.75)/(pi*(.01)^2*(200*10^3)) = -0.0149P After this step, I am uncertain of how I can relate the vertical elongation with AB's elongation to find...

I have just been informed, by his sister, that long-time member @wolram passed away back in August. wolram was one of the first PF members and was a mainstay in general discussion since last year. wolram was never shy asking questions and his curiosity was endless. wolram RIP, thank you for your...

Why didn't anyone tell me?

Hi, I have a class master_t which is composed by two other classes, dev_a, dev_b. I would like that a member function from the dev_b object (within master_t) could use a member function of dev_a object (within master_t). This is a minimal working code, where line 26 implements this feature...

I'm a maths enthusiast with a pure A Level mathematics qualification. I'm currently looking to improve my physics knowledge as I have a great interest in astronomy. I'm also curious about gravity. I would like to thank you members in advance for the assistance you provide. I look forward to...

I got my last post locked due to insulting a member here. I do apologize I'm under a lot of stress and was nothing personal. The post was about the level of difficulty of engineering courses compared to those of mathematics at the undergraduate level. I am just curious if anyone would be kind...

For this problem (see image), I get the correct answer for the normal force at point E if I: 1) divide the frame into members AB and CB, 2) solve for the x and y components of the reaction force at point B, 3) make a free body diagram with the cut at point E forming member EB and setting the sum...

Hi I am working on Chapter 11 Structure, this is pointer of structure where the structure has a member that is a pointer variable. I just want to run by you guys to make sure my understanding is correct. Below is a program I wrote for verification. It works...BUT I afraid it's like last time...

I am seeking some professional help regarding a recent single man lift I purchased. My question is regarding tipping force calculations. I will try to explain all of the pertenent details as best as possible. The lift I bought weighs approximately 600 lbs. It moves around on caster wheels but...

Yes, that's me in the video @anorlunda . The TedX experience was great. They worked with me for 3 months refining and practicing the talk. I got great feedback from many polished speakers. The result was that the message changed almost totally from my first draft to the final draft. I...

Coherent Quantum Physics: A Reinterpretation of the Tradition by @A. Neumaier https://www.amazon.com/dp/3110667290/?tag=pfamazon01-20

Hello all I was hoping someone could explain Axial Forces with respect to the diagram below. I know that Axial forces relate to compression or tension and if the forces go through the centriod then it is said to be concentric or if it is not going through the centriod then its said to be...

Summary: Meaning of each member being a unit vector, and how the products of each tensor can be averaged. Hello! I am struggling with understanding the meaning of "each member is a unit vector": I can see that N would represent the number of samples, and the pointy bracket represents an...

Hi everyone!( Hope I'm not posting this in the wrong way. I was told to give a new member introduction here so here I am!) I'm Shreyas, an aspiring theoretical physicist with a long term fascination for physics. I'm in class XII currently(i.e. in high school). I became interested in this...

My name is Pedro, and I am joining this Forum, for educational reason, I want to learn everywhere (because let's be honest, Physics is awesome, so I decided to join Forums and more.

I isolated the member ABC and drew the free body diagram: α is then calculated using inverse tan: Tan-1=(6.25+15)/50=23.03 Then force of member BD on the joint can be found by sum of all moments around point A. Then Ax is calculated which is equal to BD×Cos(α)=235.2×Cos(23.03) Ax=216.48...

It might just be I hadn't notice, but the "Member" page can be seen on the mobile from the dropdownbut not the laptop version of PF.

I am Baibhab Bose, from India. I have just completed Masters in Physics from University of Delhi. I hope to delve into deeper insightful discussions on physics and mathematics and would like that there would be no 'Poles' of any order in the space of my understandings which is inside the...

Hi there, I'm new, i would enjoy to learn a lot from here, and hopefully also contribute. kind regards

As requested i will henceforth introduce myself. I am 23 years old, studying for a bachelors in physics, i am now just beginning on my second year :) My area of focus of my bachelor is in Quantum Physics, And i am thinking of persuing either the route of Solid State Physics or Particle...

Homework Statement Homework EquationsThe Attempt at a Solution I just want to know if I am doing this right... So, my homework is to calculate the members of a truss. So, here i have a picture of a bridge (truss). I am suppose to calculate the member going from U3 to U4. Thus, I am going to...

Homework Statement There are 15 members of a maths club. There are 4 different medals to be randomly given to the members of the club. What is the probability that no member will receive more than one of the medals. Homework Equations Try to find the number of combinations where no member...

Hi my name is Chad, I am a graduating high school student specializing in STEM. Hoping to meet Science and Math enthusiasts here and make new friends who share the same passion in the Sciences and Maths.

Hi :D I'm Josip and I'm a student from Croatia. I'm currently finishing my bachelor's degree in informatics :) I'm a huge science fan and the reason I joined this forum is to read and share articles I find interesting.

Homework Statement Find reactions at ends and deflection at C Homework Equations RA + RE = 115kN ##\delta##Total = ##\sum## (PiLi)/(AiEi) The Attempt at a Solution RA + RE = 115kN Then apply superposition: (Get rid of RE) divide whole member into 4 elements and add. ##\delta##Total =...

I am a new member here and decided to join Physics Forums to get help to prepare for Physics Olympiads. I am a high school sophomore. Going to be a junior soon. I have taken advanced Math classes via MIT OCW and the internet. I am also proficient with Mechanics, but nothing international...

Tell me about your dogs, favorite breeds and share a photo! Here is my 4 year old hound Penny

Hello to all, I'm a new member. Currently I am doing my doctorate in theoretical physics.

Hey all, I'm a student in university who wants to Double Major in Computer Engineering and Physics or Mathematics. Ideally I want to get some time in working on quantum computers and some time in working on advanced AI, so one of the big things I want to do is pick the community's brain on...

What is more cool... to be a member of the Poincare Group or Lorentz Group? What name would you choose for a school science team and why?

Hi, I'm a new member!

Homework Statement Determine all member forces and state if they are in tension or compression, in particular I am looking for member AE and AB[/B] Homework EquationsThe Attempt at a Solution Ok so we are supposed to redo the problems from our exam, only I can't figure out how to find the...

Hi all, thanks for allowing me on to your forum. I'm not a physicist, but I am trying to write a piece of fiction and I'm aiming to get my physics at least some what plausible, so I thought I'd ask the experts. It goes like this: A character in a novel I'm slaving on (set in the early 80s) is...

Homework Statement In this question , I don't understand why the KBC is 4EI / L ...Homework EquationsThe Attempt at a Solution I was told that for the far end pinned or roller supported , the K = 3EI / L , so shouldn't the KBC = 3EI / L.. Is the author wrong ? In the 3rd photo , we can see...

My professor explained to us that the purpose of a zero-force member in a truss is to increase the stability of the truss during construction, to provide added support if the loading is changed and to prevent the structure from becoming a mechanism. It is this latter point that I do not...

I selected the Name "Rogue Wave" because I do a lot of boating. Rogue Waves have recently been accepted into the scientific community as a fact of nature. For centuries sailors and captains have spoken of them but, was considered to be "Tales of the Oceans". Science does move at a very slow rate...

Hi, I am Sigurd from Norway. I am an engineer (master's degree) in material science. From 2017 I will be teaching math and sciences at senior high-level. I love nature, science (especially physics), music, and spirituality without religion. I hope to have learning experiences and interesting...

Hi, a friend told me about this site and am anxious to try it out. I think it's great that you help students understand the materials by making them realize it instead of telling them. Great to be here and looking forward to our time together.. :-)

Hi everyone, My name is Tim and I'm hoping to delve deeper into topics that I gain interest in from the classes I am enrolled in. I am currently a 3rd year in Materials Science and Engineering, but I have an interest in mathematics and most sciences.

Can the envelope curve (of a family of curves) intersect a member curve of the family at more than one point? It seems possible. Consider the following. Each blue line is a member curve and the red line is the envelope curve. If we modify each blue line such that it has a protrusion like a...

Hello, I've been studying for the FE, and this question in the Statics section of the review I am going through has really tripped me up for some reason. I understand Statics, and how to determine forces in X and Y directions, determining X and Y components using trig, etc, etc.. Maybe I am...

1. Homework Statement I solved for all the forces in the members, but I was using a force truss member calculator to check my work. All the forces match up with the calculated but one, that is the force in member GH. I get 11.3 in tension the calculator gets 6 in tension. So am I right or...

Homework Statement Homework Equations The Attempt at a Solution https://scontent-lhr3-1.xx.fbcdn.net/v/t34.0-12/13140955_10156888508510486_863100825_n.jpg?oh=3f13a038f3dc053c7a10858aa62f6fc0&oe=57318819...

in the case of the picture below, for the central plate of thickness 1 inch, is it the force on a bolt F/2 divided by 2at that results in F/4at ?thanks

Hi everyone! I'm brand new to this, but hopefully I'll pick it up quickly... I had a very general question about going to graduate school for physics. I'm a junior undergraduate going for my B.S. in general physics, so naturally I'm thinking about grad schools at this point. I've got a 3.98...

hi all how can i start to study physics ? please help me

Hi my name is dev. My reason evolved thought, my objective: "To repair the singularity" My thoughts are not based on facts. They are creative, and thoughtful and based on logic, imagination and possibility. My theory is a guideline. Its inspirational, and it will merge knowledge into...