Concepts Definition and 403 Threads

Homework Statement A) [Directly proportional/Inversely proportional] The electric field inside the wire is ... to resistivity of the material the wire made of. B) [Directly proportional/Inversely proportional] The electric field inside the wire is ... to the current passing through the wire...

HELP! PLEASE concepts in free fall an object is thrown upwards, at the top of the path it has a) zero acceleration b) maximum momentum c) maximum kE d) is at equillibrium e)none of the above i know accelarion is 9.8m/s^2 i also know is not KE since at the top is potential im...

Can you explain me how to realize these experiments? I would to reproduce them. http://it.youtube.com/watch?v=c3asSdngzLs http://it.youtube.com/watch?v=t7s3cvm6CfY&feature=related Can you explain me the theoretical bases of those experiments?

Homework Statement The sketch below is a side view of two capacitors consisting of parallel plates in air. The capacitor plates are equal in area but the plate separation differs as shown. Individual capacitors are specified with two letters, for example WX is a single capacitor. The charge on...

Homework Statement The sketch below is a side view of two capacitors consisting of parallel plates in air. The capacitor plates are equal in area but the plate separation differs as shown. Individual capacitors are specified with two letters, for example YW is a single capacitor. The charge on...

Hi, I'm new to the forums here but I just wanted two Article summary on the concept of time and spacetime please , I really need it

It is clear that the concepts of position and momentum are idealizations from our macroscopic experience which are not appropriate in the quantum domain. Yet, in the presentations of elementary quantum mechanics I've seen so far, they are still used in a fundamental way. But obviously, they will...

what are the fundamental symbols in logic? maybe this is a vague question but that's cause i don't know anything about logic. are they \neg \wedge \vee? do we define the material implication in terms of these symbols? basically I'm having trouble understanding the paradoxical nature of...

My girlfriend has a younger brother who's 8. He starting to understand some concepts about life, but he's still misunderstanding a lot of them. Not having a younger sibling in my life to teach and guide I was kind of wondering how someone would actually teach kids some life concepts? Is it...

Goodevening, I am confused with Venn diagrams questions(2/3 circle diagrams). Can i find some online resources which explains its concepts(including advanced concepts). Eg. 3circled(A,B,C) diagram is there. Find minimum/max. possible of ONLY A such that B is minimum/maximum - how to do these...

Homework Statement Well were making a poster about circular motion. I was wondering if you guess had any other important things i should add on there about it. Homework Equations ac=v^2/r fnet=mac The Attempt at a Solution So for the circular motion the subtopics in the book are...

Homework Statement A fisherman and his young nephew are in a boat on a small pond. Both are wearing life jackets. The nephew is holding a large helium filled balloon by a string. Consider each action below independently and indicate whether the level of the water in the pond, Rises, Falls, is...

Homework Statement Explain why a sharp knife cuts better than a dull knife Homework Equations None that i know of The Attempt at a Solution Not sure where to begin 1. The problem statement, all variable and given/known data what happens to the density of air in a common rubber...

Hey, I see a lot of things going on with some mathematical equations that even I would do, but I'm always confused by them for some reason, such as: \frac{\sigma-\delta}{\sigma} Wouldnt this just be equal to: \frac{\sigma}{\sigma} - \frac{\delta}{\sigma} = 1 - \frac{\delta}{\sigma} I...

People tell me that a straight column wood is stronger than applying weight on a slanted angled wood. It seems like common sense that there's more force applied on an angled wood but when I try to prove it I can't seem to prove it with math.. Please help me.

I submitted this last night, but for some reason it didn't go through... so I don't have time to make it as awesome as I had before. Through what potential difference would an electron need to be accelerated for it to achieve a speed of 39.0% of the speed of light, starting from rest? C =...

We just started applying the concept of potential energy and conservative forces in my electromagnetism class, so I might have a few of these up soon. Question : Through what potential difference would an electron need to be accelerated for it to achieve a speed of 39.0% of the speed of...

Hello, I have merely been brainwashed by the formulas and math of AP Physics. Now, I want to actually understand what I was being taught. I don't really want the answer to my question, but the questions that are in the brackets. 1. What is Kinetic Energy?(I know faster an object, the...

Hey all, I don't know if this is the correct forum, but can anyone give me advice on remembering material? My professor has a lot to cover in a short amount of time, and so we move through materials rather quickly. Now, this has no bearing on my tests, quizzes, or homework (I'm doing rather...

Homework Statement Consider the fission reaction in which 236U92 breaks up into 141Ba56 and 3 neutrons and an unknown fragment. Which of the following statements are true about this fission reaction in particular and nuclear reaction energies in general? You are given a plot of the binding...

I'm giving a talk entitiled "concrete analogies of abstract concepts", where I give examples of concepts in mathematics that might have arisen in things found in every day life. I already have "chess" for isomorphism and "acronyms" for homomorphisms, but I'm running a bit dry. Anyone got any ideas?

I am currently taking a class entitled "Discrete Mathematics for Computer Science." Part of my assigned reading is an introduction to logic. I have understood everything until I reached a part called "Conditional Statements." The statement p is "Maria learns discrete mathematics." The...

doppler effect / expanding universe . trouble uniting both concepts? Ok, I think I understand both; I just don't understand their relationship. As I understand the doppler effect, in short, its cause by the difference in velocity (movement through space). And as I understand the expansion...

A very vivid approach to learning a few concepts in engineering and physics. Some topics are: How Semiconductors and Transistors Work (1) Making an Integrated Circuit Scanning Electron Microscope (SEM) The above are a few of my favorite. They have done a tremendous job in providing easily...

Hello, I'm taking cal I and II this summer as a special five week course each. I need a good way to understand the concepts of calculus. It seemed like in college algebra the examples that were done in class were fine, i could do those with no problem, but once I got home and looked at the...

Homework Statement An an electric field. An electron is held stationairy in a vacuum between two charges metal plates. It is attracted to the positive plate since unlike charges attract. The weight of the electron balannces the electric force. Now these two forces are balanced...

I'm in Calc II right and have switched my major from biology to math. I go to a small liberal arts college, my calc class consists of 8 people. Needless to say, the professor continually calls on each one of us in class to make sure we understand what's going on. I've been doing A+ work...

This may be inapplicable to the advanced thinkers in here, but I, at 17 am learning about special relativity for the first time and i find that i am very slow at understanding the very basics of it. I have always been slow at grasping concepts because i like to be very sure in my thinking. I...

Homework Statement What are elastic and inelastic collisions? What is an explosion?Homework Equations N/AThe Attempt at a Solution In elastic collisions, the colliding objects bounce off of each other to some degree, and kinetic energy is conserved. Inelastic collisions involve the...

In response to a very critical review in another thread of the following statement by philosopher Ayn Rand. "Every word we use (with the exception of proper names) is a symbol that denotes a concept, i.e., that stands for an unlimited number of concretes of a certain kind" (A. Rand, 1979...

I am a beginner on integration and I am stuck on some concepts. I hope that someone can explain, thank you so much!:smile: 1) "Let f be continuous on [a,b]. Take a partition P={xo,x1,...,xn} of [a,b]. Then P breaks up [a,b] into n subintervals [xo,x1],[x1,x2],...[x(n-1),xn] of...

I need to be able to build a trebuchet,write a 15 page technical paper on it, and give a 5 minute speech on the different concepts of a trebuchet. I have never taken physics being a biology kid myself. So therefore I know only very basic physics. I will of course need to do a lot of...

I recently made several comments about the sole use of formulas when a logical approach would be as effective. https://www.physicsforums.com/showthread.php?t=150999 I am a high school senior taking AP physics C. Last year I took a more basic course, and in both of these classes (more so...

"Concepts and Misconceptions in Physics - Rahul Tuli" hi all Am frm India and this a bk by an indian author . Anyone who is using or has used it...?Is this a good book.Iam keen to know about some of its FEATURES.Moreover will it help in some last moment brushing of essential concepts and help...

hi all Is this a good book.Iam keen to know about some of its FEATURES.Moreover will it help in some last moment brushing of essential concepts and help me in clearing out my conceptual doubts(Iam preparing (self study)for AIEEE & BITSAT 2007).I need some guidance urgently. Thankyou!

1. Water in an electric kettle connected to a 220V supply took 5 minutes to reach its boiling point. How long would it had taken if the supply had been of 200v? My ans: 6 minutes 2. Does the e.m.f. of the cell depends on the size of the plates? 3. Tail of a comet always points away from...

Does anyone know a website/book that teaches you concepts?? I need another source to accommodate me in my Pre-Cal/Math Analysis studies. Sometimes, my teacher just admubrates the concepts and the book gives abstruse explanations or an inadequate amount of examples to make me understand it...

I don't understand these concepts very well. Could someone please take the time and help run through a few of these problems. I don't want the answers I want to know how to get them. Any help would be appreciated, thanks. 1. Two builders carry a sheet of drywall up a ramp. Assume...

Hi all, I m having some difficulties understanding some basic concepts of thermodynamics: -What is reversibility? Ok, i understand that if after the "go" and "return" processes, the system as well as the surroundings are back to their initial state, then we can say that the overral...

hey, i'm doing a course on materials science as part of an aerospace engineering degree. I'm just trying to gain a full understanding of some of the fundamental concepts involved. Would i be right in saying that, all processes that occur in metallurgy on an atomic scale (like...

Most 3d volume formulas look similar to their corresponding 2d area formulas for a particular shape. How does calculus, specifically integration, relate the two sets of formulas? For example: how is the formula of a cone derived from the formula of a circle?

Anyone know a good text that covers the conceptual aspects of calculus? I can do the math, but I like to understand conceptually what's going on. The current bug in my ear is indeterminate forms (limits of 0xinfty, 0/0, 1^infty, etc.). I see that they are indeterminate (heck, I do the...

I can learn how to do the problems, but I never understand why I'm doing the problems. Exactly what am I proving or figuring out? I can do derivatives, but I really don't know what a derivative is, I just know how to solve a derivative problem. How do you figure the logic? I swear, Calculus was...

The subject came up in another thread. http://www.niac.usra.edu/ http://www.niac.usra.edu/files/library/misc/ What they have funded. http://www.niac.usra.edu/files/library/misc/Overview_for_AIAA_TC.pdf Highlights of CP 01-02 (from Overview_for_AIAA_TC.pdf)

Can anyone explain the concepts of deciphering codes such as these? CUSFOOEOLYIULSNAOFSDLGTUTAPURIWYNICAOOTDEKDNNHGCY

I have a few conceptual questions on limits that i need help with.. 1. A student in your class says, "The limit of the sum of two functions is the sum of the limits of the functions." When is the statement not correct? I'm not sure. I thought it was always correct because doesn't one of the...

I have a question for those of you who may have seen books/resources on this before. I am just finishing calculus 2 this semester and will be continuing in math next year. What I would like to know is whether there are any books written for my mathematical level of knowledge that would...

In case the name didn't give it away, I like science fiction. A while ago (more than a year ago) I decided to look into space combat from a scientific standpoint. After spending huge amounts of time procrastinating from real work by looking up laser efficiencies, theoretical maximums for...

In this thread, I will explore some elementary concepts in fluid mechanics, starting with the distinction between a particle description and a field description (Lagrangian vs. Eulerian formalism). I will continue by distinguishing between the concepts of particle trajectories, streamlines...

Can anyone help to clear these up for me ? If you have a wedge on a horizontal frictionless surface, a block starts from rest and slides down the inclined surface of the wedge, is rough. During the motion of the block the center mass of the block and wedge --- - would it be moving...