Concept Definition and 1000 Threads

Im really having trouble wrapping my mind around the topic of maclaurin series, my problem requires me to find the maclaurin series of f(x) = 1/(1+x^2), then use that to find the maclaurin series of g(x)= arctan(x)...i don't even know where to begin.

Hi guys, I find it quite difficult to visualize torque. The picture I use as reference could be found here. http://hyperphysics.phy-astr.gsu.edu/hbase/tord.html I have had this disk with spindle thing & had tried rotating it. But I did not feel anything in the direction of torque.(red arrow)...

This is a concept that has always eluded me. I'm a Biologist who works in the Pharmaceutical Industry and I need to get a better understanding of Biophysics with respect to enzymology, specifically with regards to crystallography, electron microscopy, and catalytic site binding physics. I...

When an aircraft begins to nose up the effects of gravity begin to slow its velocity. By dividing 100% by 90 degrees you get the number 1.11. So for each 1 degree incline the force of gravity increases by 1.11%? So at 1 degree the force of gravity is 1.11% 45 degrees the force of...

Homework Statement Prove the following useful fact: the least-squares fit for a line through any set of points (x_1,y_1) ...,(x_N, y_N) always passes through the "center of gravity" (x-bar, y-bar) of the points, where the bar denotes the average of the N values concerned. [Hint: you know...

how can an elementary particle like a photon be massless? How can physicist measure and detect a photon if the don't know its inherent properties? I know a photon travels at the speed of light , but wouldn't you have to know a particle mass , in order to know its speed? Or are physicists...

Homework Statement In the context of elliptical polarization,every book writes out this formula: (E_y/E_0y)^2 + (E_x/E_0x)^2 -2(E_y/E_0y)(E_x/E_0x) cos ε= (sinε)^2 where ε is the initial phase difference. After that they write this is the equation of an ellipse making an angle α...

Any interested in this topic?

In problems which have a pulley with a certain mass and radius, and a massless string over it, we often consider the tension of the left part of the string different than the tension of the right part of the string. I thought that since the string is massless, the tensions should be the...

Homework Statement In which of the following situations will light from a laser be refracted? a. traveling from air into a diamond at an angle of 30° to the normal b. traveling from water into ice along the normal c. upon striking a metal surface d. traveling form air into a glass of...

How should I think about the concept of phonons? As I understand it, it is a wave which propagates with a speed similar to sound and models the movement of atoms in crystals. However how many atoms per phonon? And isn't phonons meant to be analogous to photons which are single units hence one...

1st question Ohm's Law is R = V/I; however there is another law that states : R = p (L/A) (the p should be a rho, i know) so this means that V/I = p (L/A) ? 2nd question A resistor in a circuit can have a smaller current in it than the actual wire because of a higher resistivity...

Hi, I am curious to kow about this smoothing concept that I've seen mentioned somewhere but do not understand. It would be great if someone could explain it to me, preferably through a solution to this problem. Thanks for any comments. (Latex did not generate in the preview, so if it seems there...

I am studying 'Integration' These are the questions I have been thinking of, but i still did not get it. 1.I understood the basic concept of dx and dy But I don't know what exactly does dx stand for in the definite and indefinite Integrals. \int x^3\, dx\right)2. I have read a proof in...

concept of resistive touch screen, anyone an IEEE member? hi, i am having a problem with my 8 wire resistive touch screen the cursor keeps drifting about due to analog noise i suppose i would need to program an algorithm to clean up the noise to keep it stationary. i have tried putting a...

Please help, I'm confused with an "easy" concept. Suppose you drop an object off a cliff. Does increasing the mass of the object you drop decrease the time it takes the object to reach the ground? (Assume that air friction is neglected) Is this true to infinite extent? So if there was no air...

reality or myth? what traits make someone a soulmate? do you have one? i dont! and i even don't know what's that!:cool:

i just don't understand why an object will experience buoyant force equal to the weight displaced when it is partially or wholly immersed in a fluid.I don't want to memorize this,i want to understand and get the idea.But i just don't seem to understand.

Hi My thought might be a bit weird or maybe childish, but I can not find anything to object it or to prove that it is wrong. As a basic definition of a straight line that it is an infinite number of points that are connected together. Regardless the length of that straight line, it consists...

Hello, I have read over many textbooks and websites (including posts on this forum) relating to the concept of tension but I am still a bit confused. Many sources seems to only define tension rather than explain it. They seem to assume that you know it the way you know 1+1 =2. Here is the...

I am having trouble wrapping my head around the concept of the constant speed of light. Imagine I am moving in a ship at a certain speed (let's say 1/4 the speed of light). I send two probes out at the same speed, one directly ahead of me, one directly behind me. They are set to activate a...

Current Electricity: Help understanding concept of "potential energy" This is not a problem that I need help with. I rambled on and on for 5 minutes with teacher, eventually giving in and pretending that I understood.. http://i80.photobucket.com/albums/j199/pugfug90/CEPE.gif Umm.. Perhaps...

How does a small change in base current result in a large change in collector current in a BJT? Please explain in terms of movement of electrons (in NPN). Most textbooks I have referred say that the reason is low resistance of emitter-base and high resistance of collecter-base. However i cannot...

Hey guys, I’m currently working with a personal water craft docking company that is trying to redesign there current port series models into something that can capture the market as well as be designed to hold future personal water crafts i.e. jet skis and there future bulkier sizes and...

I am studying divergence and curl in my E&M class. I was wondering, why is divergence a useful concept? I mean, for point charges, the divergence is zero everywhere except where the charge is located. Even for charged surfaces, \nabla\cdot E = \frac{\rho}{\epsilon} Loooking at this it seems...

I have some confusion about what 'radiance' means as used in radiometry; specifically, I don't understand what it is a function of. For example: radiant energy is specified over some region, radiant energy density is specified at a point, radiant flux is specified across some surface...

I am having trouble understanding the concept of the effects on an orbit. The question asks if we replaced the sun with a rock of the same mass, would Earth's orbit change? I think it doesn't because orbits don't change because of its orbital energy. but I'm not sure because i wonder if the...

Hi, I'm looking for some information about effective potential, but I haven't found any (Wikipedia, Googled...). I was just willing to get a rough understanding of the concept, and understand what it is. Could you explain/link to good info please? Thank you very much.

I cannot understand how to apply the concept of relative velocity in certaijn questions like the below one the question is Two trains A and B of length 400m each are moving on two parallel tracks with a uniform speed of 72km/hr in the same direction with A ahead of B The driver of B decides to...

I've come across the Kondo effect in my research and specifically measuring the Kondo resonance. Now I'm sure I don't need to be an expert but I having some trouble clearing the concepts, the actual physics in my head. I know the Kondo effect is an exchange of spin do to an interaction...

Homework Statement http://xs511.xs.to/xs511/07046/workenergy.JPG Homework Equations The Attempt at a Solution Ok I am all confused on this one. ok so leave part (I) and (II) onto part (III) word done by the pulling force acting on the block = the loss of energy + work...

Homework Statement This is more like a concept question. If you have a solenoid with AC frequency f, placed in close proximity on top of a wire with both ends fixed, and projected parallel to it, why is the frequency of the standing wave observed in the wire equal to 2f? The Attempt...

hi everyone, I am just learning the taylor series at school. I am slightly confused. in my textbook, one of hte exercises is to find hte nth degree taylor polynomial of x^4 about a=-1. n is 4 in this case so this gives me a long polynomial. i understand that inputting any x value into this...

So a previous problem said to show that the area of some simple closed curve C was: A= \frac{1}{2} \oint_{C} (xdy - ydx) Simple enough. My problem says to find the area of the curve x^{2/3} + y^{2/3} = 4 using that formula. So off to polar coordinate land I go. r = 4, x = cos(t), dx =...

sir i haven`t good idea about function analysis &limit&continuity pls send me the message containing all this thankyou sir

"When a ball is dropped to the floor from a height h, it strikes the ground and briefly undergoes a change of shape before rebounding to a max ht. less than h. Explain why it does not return to the same height h." Is this because some of the kinetic energy is transferred to heat?? What does...

hmm I don't think I have the concept of the wronksian down all the way yet. mainly I'm having trouble seeing how the the wronksian not equaling zero implies that all the solutions are linearly independant of each other.

OK, I'm having trouble with this and can't seem to find an explanation for it. So To start off, i understand gravitational force, which is always just m*g (mass * -9.8 m/s). Now, when an object is moved by a force either horizontally or up an incline, etc. how do you figure out the work done...

[SOLVED] Why is push gravity concept considered not viable by mainstream science? Hello guys, I would like to know the main reasons why the push gravity concept is not considered as a viable concept by mainstream science. I know it gave rise to numerous published works, amongst which we have...

Here's the question: ------- A 0.5m3 rigid tank contains refrigerant-134a initially at 200kPa and 40% quality. Heat is now transferred to the refrigerant until the pressure reaches 800kPa. Determine (a) the mass of the refrigerant in the tank and (b) the amount of heat transferred. Also, show...

Here is the given problem: http://img213.imageshack.us/img213/6781/problemtk6.jpg Here is my incorrect solution: http://img152.imageshack.us/img152/6698/solutionzm3.jpg Why should distance even matter for the final velocity in this problem since once the spring is uncompressed...

I'm trying to understand the utility of the concept of apparent weight. I'm not trying to over throw centuries of science, but it just seems not to be very useful to me. Why is it useful to say 'the apparent weight in an accelerating elevator is more (less)' rather than to just say 'you weigh...

I guess this is going to be my worst thread. I'm so sick of this stupid concept "relative velocity" that I'm in no mood to present this thread in my "exemplary style" for which i have been included in the "best homework threads" section. I'm sorry for that, but its true. I have no problems...

A 0.6 kg baseball is dropped out of a window that is 6.1 m above the ground. The ball is caught by a person whose hands are 1.5m above the ground. Questions What is the gravitational potential energy of the baseball, relative to the ground --When it is caught? (Is this -27.05 J ?) --when...

Three objects with masses m1 = 4.0 kg, m2 = 10.0 kg, and m3 = 15.0 kg, respectively, are attached by strings over frictionless pulleys, as indicated in Figure P5.32. The horizontal surface is frictionless and the system is released from rest. Using energy concepts, find the speed of m3 after it...

Can someone please explain to me the concept of equilibrium because i am having trouble understanding it. Thanks

Hi all (it has been a while again), I have just started Universtiy and after my second lecture I was given a question sheet to complete in two weeks. I have completed 14 out of the 16 questions set, 2 of which I just haven't done yet and another will require a little more thought before I...

The problem is to rank the forces exerted from three blocks on top of each other. Like so: [10 kg] #3 [5 kg] #2 [2kg] #1 -------- Here is my reasoning, From least force, to most force: a. Force of block #1 on #3; They don't touch, so net force = 0 b. Force of #3 on #1; same thing...

Does anyone know of a good site that has good physics concept questions because our tests in class are 10 multiple choice questions--usually concept questions (since we can't use a calculator just like the AP Exam) and two free response questions. i need a little help with those concept...

Hey. I am having a little trouble understanding the concept of impulse. The textbook i am using doesn't really shed much light onto the topic. I know that impulse is equal to the change in momentum of an object, or the product of a force applied to an object and the time it is applied for...