Beginner — 350 discussions

Where does the Coefficient of Restitution equation come from, in terms of the Conservation of Energy? The measure of efficiency is the velocity after the collision divided by the velocity before the collision, but how does it get to that point? I'm trying to view this focused on an object that...

When using the work-energy theorem (Wnet=ΔE), when do you take gravitational potential energy into account? Change in energy implies all types of energy involved, but in what cases would PEg be a part of it?

Homework Statement A 95-kg mountain climber hikes up a mountain to an elevation of 5000 m. What is the change in the climber's potential energy? Homework Equations I might be missing something but here's everything that might be relevant: w=fx p=w/t p=f*v KE=1/2mv^2 PEg=mgh PEe=1/2kx^2 Wnet=E...

How should power be calculated in a situation where distance and time are both given, as well as mass. At first, I was thinking of just using W=Fx (force as mass x 9.8) to solve for work, and then I would take the solution for work and put it into P=wt. Does this make sense? That's my best...

I've just signed up for Physics Forums, and in the email I was instructed to follow a link and 'introduce' myself which has lead me to start a thred here. I am a Nurse of 9 years, and a business partner with my husband. The name of our business is Shoestring Book Publishing. It is a viable...

Hi, let me introduce myself. My name is Paolo i’m from Argentina and I have 26 years old. I study “skills in the direction of sales teams” and I’m the coordinator of a sale team. Since I was 15 I love all referd to physics and six years ago I start seeing videos of talks from many scientific...

I am trying to learn all about Quantum Physics on my own but I am struggling to find credible sources of information. As you are probably aware the internet is filled with misconceptions, crackpot science and weird stuff about spirituality (at least that's what I find when I try and research...

First of all, I'm new here, so hello everyone! Apologies if this is posted in the wrong thread, I recently started getting into high-ish physics in general, so I'm coming from a low-ish background in the way of math- a couple courses of calculus (single variable covering the basics of the...

I'm having a difficult time understanding why the internal resistance of the EMF source is disregarded in this problem. 1. Homework Statement You are asked to determine the resistance per meter of a long piece of wire. You have a battery, a voltmeter, and an ammeter. You put the leads from the...

Hello, I'm young physicist and I have had a first contact with program in fortran. It is not my code but I have got an assignment to use that for my purpose. I can program in C. I watched few videos lessons for beginers about fortran and I hope I understand a structure and common commands...

Is it because it is more rigorous than books like Halliday and Resnick? Or maybe you need to digest those books as a prerequisite for the feynman lectures? Or maybe people don't believe a regular person could digest the feynman lectures as a introductory level physics book? If someone is a...

I was trying to picture the third derivative of something Then i came across these ... What does displacement mean? The variable x is often used to represent the horizontal position. The variable y is often used to represent the vertical position Displacement=Delta x=xf-x0xf refers to the...

Problem : A car of mass ##m## is parked on a slope. What does static friction ##\mu_s## have to be for the car not to slide down if the incline of the hill is ##30## degrees? ******* For this problem I have the following forces, where the hill is inclined upwards to the right: Upwards ...

Hi! I am new to this forum. If there is a topic similar to this plase ignore me for not seeing it. In the last months, I have a feeling of wishing of learning physics. Therefore, I did some research that how to learn. I looked at a lot of sites but couldn't findy any specific books that are for...

I just came across this recently released title by David Morin, "Special Relativity: For the Enthusiastic Beginner". If its anything like Morin's past books, it'll be excellent for self studiers. https://www.amazon.com/dp/1542323517/?tag=pfamazon01-20

I am just curious about this. Must one of these be taught before the other, or does the order not really matter? Should a student be taught beginning computer programming AFTER being taught introductory algebra 1? Or can the reverse order be done? My guess is that learning Algebra 1 first is...

I'm really interested in quantum physics and want to my own learning on it,but what does it contain, generally? And where should I start with it?

Background: (I'm a beginner) I plan on using PCV pipe for the main body. The drill's purpose will be to install screws into pre-cut groves (basically a motorized screwdriver). These screws will be only a couple centimeters tall so the motor will only need a moderate amount of torque and rpm. It...

I have searched the threads. Got some great insight but didn't find the answers to some of my questions Questions about Event Horizons Most of the textbooks and papers I have read no longer picture or talk about Einstein's original concept of a black hole; the Einstein - Rosen bridge. First...

Homework Statement A small list of business firms have their own registar number which is between 10000 and 30000. The first 4 digits represent the firm and the fifth digit is the control digit. The number is valid if the sum of all its digits are divisible by 7. Create a program which checks...

Homework Statement I just started learning pascal (school curricuulum) and am finding it quite boring compared to python. After skipping a few lessons i came today and we had this code shown. I know it creates a matrix and then transposes it but am misunderstanding the details of the code and...

Hello all, I am attempting to teach myself some basic electrical knowledge, but I am slow to start. I understand what resistors do and how capacitors store a static electric charge ect... The question is, can someone explain to me the flow of electricity from beginning to start of this circuit...

I'm new to the forums (here's my intro post). Also new to studying physics, though I did do one year in high school many decades back, too far to really count; and in addition have been studying EM & electronics for the past year, but mostly in an applied sense. Aside from enjoying myself, one...

Since i don't know how to write code here on forums i will upload a picture and explain what's it about. In the picture there are three codes that define the same procedure of finding the biggest number out of three given. The first code in the picture is defining a procedure called...

Can someone give me a link to a site that can teach me from the start in finding it hard to find something as you would in say a class room

I've started Book of Proof, the first chapter of which is an intro to sets. Q.1 Is there any particular way to approach these kinds of problems, other than using intuition / trial & error? I tend to have some difficulty in working out the best way to express the general term of a sequence, for...

How exactly do you tell if two elements are in series or parallel? I know that if two elements share two of the same extraordinary nodes then they are in parallel: But in this example I do not see that. I know for certain that the answer for Rt is: [ ( (R1 || R2) + R3) || R4 ] + R5

Homework Statement Find y' ... X^2+y^2=25I understand (I think) implicit differentiation, but there is one issue which hangs me up. I've done this before and this is just a refresher as my last calculus course was four years ago. From what I understand, 2x+2y(y')=0 But why isn't it...

#mark contains personal comments and thoughts # BTW this assignment was a beginner exercise at codeacademy intended to test the usage of if-structures # I was wondering about whether or not if-structure was going to work, or if I needed a loop-structure becauses I wanted to interrogate the...

Hi, I've just finished secondary school and am keen to learn some physics before going on to college. As part of this I've just finished reading 'The Theoretical Minimum' by Leonhard Susskind and George Hrabovsky. The book was a really helpful introduction to classical physics and the maths...

Homework Statement I am currently doing an internship and as part of my assignemnt I have to calculate the dynamic load on the bearing of a certain part that is rotating about a fixed point. https://www.physicsforums.com/attachments/chute-png.103400/ This is the part that moves ( the brown...

So I'm entering my second year in uni doing a physics degree. We're just about to tackle on some of the interesting topics like EM (which I've self-learnt before), Classical Mechanics(we've already covered Newtonian) and QMech. Apart from my core academics, I'm interested in pursuing some...

Hi, i am looking for a good textbook for someone who knows nothing about calculus.

So I've always been fairly good at whatever science I learned in elementary and middleschool (which was mostly biology), and I've fairly enjoyed it, but I've only recently started really learning, and I've come to love it. I've especially found quantum physics interesting, however, seeing as I...

Here's the issue: I am a junior chemistry major and the time has come for me to take a physics class called "Physics for Scientists". I have never taken a physics class before and I hear from my peers that not only is this particular subject extremely difficult, but so is the ONLY PROFESSOR...

For someone (like me) who is fascinated by maths and physics, but has had no education to speak of other than rudimentary basic stuff that was taught in my rather poor comprehensive school, finding a decent way to self teach is a bit daunting. The 'Dummies' books put me off a bit, I bought a...

(sorry for my poor english.) is there a math book for learning mathematics from the beginning until university level, like there's University Physics for physics?

What would be the best book for me if I want to learn nonlinear dynamics ? I have my basics clear in linear differential equations, linear system theory, integral transforms and random process if they suffice as prerequisites.

Physics has always intrigued me and being that I love science, I think this would be a great opportunity to gain knowledge. I am currently a freshman in high school and I find that most of the things be taught here, how should I say this? Boring. Since I want to start physics and being that I am...

Homework Statement The goal is to create two arrays that have the values a = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 } b = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} And then graph them so that a=mb slope m thus being 2. I am working on the first part before I graph them. Homework EquationsThe Attempt...

Hi folks, This is a question about how to calculate entropy change when there is a temperature change involved. I got the correct answer to this, but I don't actually understand why it's correct..! Any help is much appreciated. Homework Statement One mole of liquid bromine is heated from 30...

I'm trying to write a program to calculate the trajectory of a projectile with air resistance. I've made the following function which calculates the position of the particle based on a given launch angle and initial velocity: def traj_fr(angle, v0): #function that computes...

Does anyone know a good resource for exercises on these topics?

I'm starting to wrap my head around the more difficult aspects of electromagnetism, but I'm having a hard time finding a simpler answer to what should be a fairly simple question. What are the basic components of induction, and how much effect does each part have on the output? As far as I...

Hello! I'm trying to use a subprogram from the Starlink Project - Lucy in the library KAPPA - that is already installed and compiled. The idea is to be able to call it from my fortran routine. Something like this: PROGRAM ex INTEGER i REAL in(10),psf(10),out(10) DO i =1,10 in(i) = rand()...

Hi all. I'm a fresh starter on Geant4 and looking for anybody who is also familiar with it. Does anybody have experience with Geant4 ?

How do I know what formula to use?? I'm getting confused. Kinematics formulas Thank you

Hi I'm 16 years old, the physics and maths in school is really easy and it quickly becomes boring. So I wish to study outside of school, can you please recommend me some good books on calculus? I am a beginner in the subject and only know the big picture of what calculus actually is, so...

Doing MIT OCW 18.06 using Gilbert Strang Intro to Linear Algebra. Ch 1.2 The vectors that are perpendicular to <1,1,1> and <1,2,3> lie on a ___________. I would have said "plane". I've worked with vectors in calculus, and if you take the cross product of those two vectors you get a vector...

Hello there! I am searching for a good Physics book (or perhaps a combination of multiple) that does not jump over a lot of steps and explains everything (or at least a lot of it) from 0 up to University-level in easy language. Kudos if there is an e-book version free