Concepts Definition and 412 Threads

I need recommendations on literature to read. Basically i do not understand these section of Frank Harary's book on graph theory since the definition of what a boundary and a cycle vector is not clearly defined. I have googled literature on it but I am having a tough time finding the right...

1. The dilemma Work (change in energy) is defined as the exertion of a force over a distance parallel to the force. So if force is exerted, but nothing is moved (presumably with two immovable objects), then no energy is changed. But think about the dilemma with a person lifting 100 pounds...

Homework Statement Homework Equations Brewster's angle The Attempt at a Solution I understand why A is true, but I have no idea what concepts are at play with B, C, and D. Any suggestions?

Hi everyone! I'm having trouble solving this problem, its set up in a way that I don't understand and I was hoping someone could help clarify it with me..Thanks a bunch!

Homework Statement My questions are just related to part a of this problem. Homework EquationsThe Attempt at a Solution I know that potential inside a conductor is equivalent to potential on the surface of the conductor and potential at any point is an algebraic sum of potential...

Hi, I have the following: Let ##\Omega ## be a discrete subgroup of ##C##, the complex plane. If: i) ##\Omega = \{nw_1 | n \in Z\} ##, then ##\Omega ## is isomorphic to ##Z##. ii) ##\Omega = \{nw_1 + mw_2 | m,n \in Z\} ## where ##w_1/w_2 \notin R ## , then ##\Omega## is isomorphic to ##Z## x...

I have an assignment on researching 2 careers that use one of the units of Physics that we've studied this year. The units we studied were Forces and motion (kinematics), Energy and Momentum, Electric and Magnetic fields, and Waves of light (not too keen on doing it for this.) I have to give a...

Hello, I would like to learn the concepts of databases and practice them. I found it hard to find a good tutorial that teaches you how to start. All seem to be advanced to me! Is there a book (or a good tutorial) that teaches you both; the concepts and the applicationsof databases at the same...

What concepts are required to define a "system" in physics ? - as in the phrase "In a closed system ... " or "If two systems are isolated from each other ..."? Is "system" always used as a term of common speech, or can it be defined more precisely? For example, in the thread...

Homework Statement An inventor claims to have invented four engines, each of which operates between constant-temperature reservoirs at 400 and 300 K. Data on each engine, per cycle of operation, can be found in the table below. Of the first and second laws of thermodynamics, which (if either)...

I have learned the basic electronics and of course Volt ,amp, and ohm relation with the water pipe thing and I am just curious about some things that my prof(s) failed to answer It says that what powers the circuit is actually current, does it mean that voltage and resistance variation is ok as...

Hi Everyone! I used to have a book that explained physics concepts quite simply. I used to read it when I was about 8 or 9 years old and one chapter really stuck with me (I'm 25 now). I'm not sure where the book went, and have been looking for it for some time and think this might be the best...

I'm studying 2nd year and I'm self studying some of the concepts in the physics,so I would be grateful if someone suggests me a book for the concept understanding

Hello, I'm new here. I have a question that I don't think many people can answer. In my Engineering Design class last school year, we use physics on a daily basis. My teacher goes over units and where they come from. He also goes over fundamental measurements like mass and time. He stressed to...

[You don't need to read the whole thing, but I'd recommend doing so, because there are examples of my struggles somewhere in there, like specific problems.] Greetings as usual, It's me again. That hopeful physicist who somehow found himself at the wrong place with the wrong mind in the wrong...

Hi, I want to know about some books that can help me to clear my concepts of calculus.I know the basics of differentiation and integration,but don't have clear idea about it.Well,I would like to buy such a book that has explained the rules and methods of calculus properly.Also,I want to know...

How can something have a definitive edge if space can always be more granular?

I have completed my engineering by now. I have decided to continue my further studies in Mathematics and to be aware of all physics concepts required for research. How can I study all physics concepts from home and what time would it take for me ?

How do I know which species is a Lewis acid and which is a Lewis base?

Hi,can someone exaplain me,why do we have a few concepts of multiplication,like repeated addition,scaling,grouping etc...but only one concept for addition that means to put something together and make it more or bigger I was solving in past,why multipliplication produce new unit and so on...but...

Hello all, i recently purchased a travel trailer, and i want to create a lift to get inside it. a little background on me, i was in a motocross accident, broke my back and am now paralyzed. I currently work at a full fabrication shop as a mechanical drafter, we have the capabilities to make...

14). Student A lifts a 50-N box from the floor straight up to a height of 40 cm in 2 s. Student B lifts a 40 N boxes straight up from the floor to a height of 50 cm in 1 s. Compared to Student A, Student B does (A) The same work but develops more power. (B) The same work but develops less...

How does physicist translate their scientific concept into an image or illustration to make it comprehensible and visual. Does the physicist make use of computer-software to produce this illustrations? Who made the first very well-known illustration of gravity that causes space-time to curve...

Homework Statement (i) Suppose there's an object rolling without slipping at any surface. (ii) Now, let's say a disk is rolling and slipping toward the +x direction 2. The attempt at a solution (i) If the surface is horizontal then it won't apply any friction force on the object regardless on...

Can anyone refer me a good book for calculus from which i can clear the basic concepts.

I know several math formulas, like which I will write below. \int_{x_0}^{x_1} f(x) dx \frac{\int_{x_0}^{x_1} f(x) dx}{x_1-x_0} \frac{\int_{x_0}^{x_1} f(x) dx}{2} f(x_1) - f(x_0) \frac{f(x_1) - f(x_0)}{x_1-x_0} \frac{f(x_1) - f(x_0)}{2} \frac{f(x_1) + f(x_0)}{2} And I know too that...

Got this for Christmas and its quite interesting to read: https://www.amazon.com/dp/0321942043/?tag=pfamazon01-20 The basic premise of the book is to explore the principles of generic programming, optimization and the mathematical concept of abstraction using traditional mathematical...

Something that recently caught my attention was the slowing of light particles - and keeping them slow. Light naturally slows when passing through transparent mediums, it is only in a vacuum that light move at it's true speed. By passing light through a mask made of transparent liquid crystals...

Hey everyone, I am beginning calculus 2 and physics this coming semester. I am not very anxious about learning the material, as it seems concepts typically develop overtime. However, I have a huge issue with retaining material. Previously, I've basically worked multiple practice problems until...

Hi, I am trying to solve the problems in the exam paper posted below, this is a HIGH SCHOOL probability exam paper. http://www.nzqa.govt.nz/nqfdocs/ncea-resource/exams/2015/91586-exm-2015.pdf I have put down my answers to these questions. Could you guys do it as well and take a look at my...

Simple question, simple example. (x-1) \frac{(x-2)(x-1)}{x-2} So, it's quite clear that the contents of the two lines are not equal to one another. Since \frac{1}{1}\neq\frac{x-2}{x-2}, how is it the case that we can treat it as \frac{1}{1}=\frac{x-2}{x-2} when we're doing limits? Edit: Oh...

Hi And Assalamualaikum i am a mechanical Final Year student i have almost completed All the subjects, but my basic concepts are very weak, can anyone help me suggesting few books or handouts that are easy in understanding the basic concepts of Mechanical Engineering. my...

first of all sorry for bad drawing, is all of the following correct : * number 1 : the current will flow normally * number 2 : the voltage source will not give current but Vb-Va = V of the voltage source (10 for example) * number 3 : no current will flow * number 4 : the voltage source will be...

I have been browsing the web, and I notice that I could not find any websites that have real analysis text around. Yes, I understand that I should look for books written by professionals in the field, but I do not know which one I should buy. Do you know of some online resources to real analysis...

Hi What are the key concepts of Maths and Physics that every parent should ensure their kids know? Major focus of this I am concentrating on is one a strong basis for them to be informed and backed with key knowledge to allow them to be curious and explore and learn.

Hello everyone. I am about to start Calculus 1 and then Calculus 2. I want to get an idea of how the order of concepts of these to classes are generally laid out.Thanks

Inorder to start with calculus ,which topics in mathematics are required and are there any books for beginners to learn calculus?

Unsure what or which answers are incorrect. 1. Homework Statement In the figure below, assume that the pulleys are massless and frictionless. **Attached File** The masses of the blocks are Ma=1.50 kg, Mb=4.00 kg, Mc=6.00 kg, and there is friction between the horizontal plane and Mc, (μk≠0)...

I do not understand this even the one in Wikipedia. Can anyone explain it to me as simple as possible as well as give me some simple examples? Thanks a lot!

Hello, I am a high school student and I am studying about rotational motion this term. However, I am having a bit of trouble understanding some concepts about this idea; specifically about cars and turns. First of all before talking about cars turning corners and the forces there, I don't even...

Hi there, I've forgotten how to solve these problems, eg: If I've got two shafts, two wheels per shaft meaning four wheels in total, each wheel is 60 mm in diameter, and the power consumed by the system in providing a constant horizontal velocity of 0.15 m/s is 200W, what is the torque in each...

Perhaps aptly, the subject of entropy is a serious mess when one attempts to use Prof. Google to learn about it. There's just too many disparate concepts across too many different domains for me to be able to piece it all together. With the baseline that I've learned the simplified...

I've been tasked with giving a presentation on any subject i like to my undergraduate physics class. Inspired by a recent lecture i attended by David Tong i have chosen to do a quick (10 minute) overview of the current state of theories beyond the standard model, obviously aimed at being...

We are modifying our middle school physics curriculum. What are the ten most important physics concepts for middle schoolers to learn for a solid foundation in physical science? Secondarily, what labs are most memorable to engage students in these concepts?

Homework Statement Hi folks! :) I have a problem with the following problem. Take any methyl halide and prepare methyl iodide.Choose the appropriate solvent. Now what i know is here we are going by SN2 mech and replacing a halide by iodide ion.But the problem i am facing is how can i replace a...

I want to learn clifford and grassmannian algebras. I need to be taken from mostly a beginners point, and from a place of matrices only in general terms, and years since use. ANybody up for it? I am a software developer, so not at the bottom of any learning curve.

I'm trying to understand what exactly it means by some tensor field to be 'well-defined' on a manifold. I'm looking at some informal definition of a manifold taken to be composed of open sets ##U_{i}##, and each patch has different coordinates. The text I'm looking at then talks about how in...

I have read 'comoving observers are a special set of freely-falling observers' . I have the following definitions: Comoving Frame: "defined at a time t is the inertial frame in which the accelerated observer is instantaneously at rest at t=t0. (Thus the term 'comoving frame' actually refers to...

NOTE: The following questions are not part of any homework assigned. This is part of finding extra concept-related questions to help me study for my physics unit test. Homework Statement I have conceptual questions, not problems. I'll provide sufficient evidence that I've attempted to think...

I've been into physics for years now but no matter how much a study, i find that i always lack basic knowledge that others seem to have. I was wondering could someone provide me (if possible) with a list of fundamental concepts every physicist should know? i imagine the list might be to long or...