Application Definition and 945 Threads

Homework Statement Let f: \Re \rightarrow \Re and g: \Re \rightarrow \Re be functions such that lim_{x \rightarrow 1} f(x)=\alpha and lim_{x \rightarrow 1} g(x)=\beta for some \alpha, \beta \in \Re with \alpha < \beta . Use the \epsilon-\delta definition of a limit to prove...

Homework Statement Can anyone here help me find how and where trig identities are used in real life. can you also tell me which identity(with example) and is used for what purpose and how. Homework Equations The Attempt at a Solution I found out that it is used in the field...

Question: Find the number of zeroes of the equation $ z^7 - 2z^5 + 6z^3 - z+1 = 0 $, in the unit disk. We have Rouche's theorem which says that if f(z) and g(z) are two functions analytic in a neighborhood of the closed unit disk and if |f(z) - g(z)| < |f(z)| for all z on the boundary of...

Hello all, I'm finally preparing to apply for PhD, so it is time to write a good CV. My situation: I'm about to finish my MSc degree (research based) and intend to apply to several universities in Europe, mostly in the UK and Germany. Do you think I should list the research projects I...

I saw in an application of Sylow's theorems, it said we have something like a group of order 28 = 2^2 x 7, so we have either 1 or 7 sylow 2-subgroup. Assuming we have 7 sylow 2-subgroups, then we have 21 non-identity elements and the identity, and we have 1 sylow 7-subgroup, blah blah blah...

I am adding a function to the rear Turn Signals on my motorcycle (12vDC negative ground system). Turn Signals have 1157 incandescent bulbs - they have two filaments and three wires: ground, hot to running light, and hot to flasher. I want my Turn Signals to ALSO act as Brake Lights. So all...

Homework Statement A factory has a machine which bends wire at a rate of 4 unit(s) of curvature per second. How long does it take to bend a straight wire into a circle of radius 8? My professor likes to give us things we've never seen before on our weekend quizzes. The above is one such...

Hello all, Does anyone know how to open a .pdf file (or a .exe) file from a Visual C++ 2008 express edition program? What I am trying to do is to have the user enter a number that corresponds to a certain .pdf file and have that .pdf file open for the user to read,save,print, etc ...

Homework Statement Molecules with diffusion coefficient of 1.0 x 10^-10 m^2s^-1 are released at a constant rate of 10^10 molecules/s in the middle of a large pool and dffuse away ( assume the 3-dimensional pool is of infinite size). What is the steady state concentration 1 cm away from the...

Application of a Limit of a multivariable function..HELP! Homework Statement if f (x,y) = (xy^2)/(x+y^2). prove that for every real number a there is a path along which f (x,y) will approache a, as (x,y) is approaching (0,0). Homework Equations f (x,y) = (xy^2)/(x+y^2) A as a...

I have a test application that required a high velocity (subsonic) air trough a restriction in a close loop system. I would like to know which circulating fan would be suitable (axial, centrifugal, mixed flow, turbo) since the fan will have a backpressure from the close loop arrangement...

I have just came up with the following idea which can, with the proper equipment and technology, be applied in space in order to produce immense acceleration for a specific body/bodies: STEP 1: Number of engined spacecraft s will be placed in one dimension, in equal distances from one to...

Hey all, I'm applying to grad school this fall, and I'm starting to think about my application essay. I'm going for biomedical engineering (specifically imaging), and most of the essay topics are similar (Why is this program right for you? Why do you want to study it? etc.) I just bought...

I have a problem that can't be solved. So then, I put it to this Physics Forum to see if anyone comes up with a brain storm ( or directs me to a solution which my expert may have been unaware of ). Doing Power over Fiber is "impossible" today for a broad-based residential application...

Homework Statement Consider the circuit shown below. (a) Determine the current reading of the ammeter. (b) Determine the voltage reading of the voltmeter. (c) Determine the power dissipated by the 500 W resistor...

Hello! I was wondering about Bethe Ansatz . From what I've read, BA applies to 1D systems of N fermionic particles. Let's say I have solved 1D problem for one particle. Now, I want to setup some boundary conditions (e.g. infinite deep well) and insert, say 3 fermionic particles and...

In two months, university application will start. So I have this little time to decide what to do. I don't think it is a possibility to do everything I want so I have to narrow it down to one. What can I do?

simple application please..o:)

Would someone be so kind as to enlighten me here? My wife and I were discussing grad school application deadlines (which are still a way off, but it's fun to daydream) and she commented on how early they were at most of the schools we were just glancing at. January 31st was a common date, or...

Anyone familiar with BarCode scanners? I have four of them I want use with my app. Can a console (custom) app be used to load/save scanned data?

HI I'm not to sure where to place this post. I'm looking for a computer application where I could plug values into get charts , bar graphs pie charts etc. I do not have very much experience in this field , but I want to play around. If you guys know of any great programs that can produce...

I have a GUI interface designed in MATLAB GUIDE Builder. It works with several MEX files that control a piece of hardware. I need to compile this into a standalone application. The deploytool's build function never compiles - it complains about the MEX files and returns: "Error executing mcc...

Homework Statement A tank in the form of a hemispherical bowl of radius 4 m is full of water. Find the work required to pump all of the water to a point 2 m above the tank. Homework Equations w = fd = mgd density = 1000L/m2 1L = 1kg The Attempt at a Solution x = height w...

I'm trying to fill in an application for a scholarship to study medical physics. The instructions are thus: My goal is to eventually run my own lab and clinic (within about 15 years time frame), but I can't think of anything to write to make it more than about 5 lines, basically just...

Homework Statement When a patient’s injured neck is healing, it is often desirable to prevent the weight of the head from pushing down on the neck. This can be accomplished with the system of pulleys shown in the figure. The pulleys are all small and extremely light in weight and have no...

Homework Statement Estimate the wavelength of a 30 keV electron. Homework Equations p = h/λ E = hf The Attempt at a Solution The electron has 30 keV of mass-energy. As it is acting as a particle-wave, E = hf, so f = E/h = 30,000x1.6x10^-19/6.3X10^-34 = 7.619x10^18 Hz Now, v =...

Homework Statement A water wave has length L moves with velocity V across body of water with depth d, then v^2=gL/2pi•tanh(2pi•d/L) A) if water is deep, show that v^2~(gL/2pi)^1/2 B) if shallow use maclairin series for tanh to show v~(gd)^1/2 Homework Equations Up above [b]3. The...

Homework Statement A linear charge lambda = 10^-11 C/m is uniformly distributed along a thin nonconductive rod of length L = 0.5 m. Use Gauss' Law to calculate the field at a distance of r = 0.1 m from the charged rod. Homework Equations ∮E.da = Q/ε_0 The Attempt at a Solution Hi...

Hey everyone! I recently picked up a motorcycle for class/work commutes because walking home at 11pm from the lab is not fun. But I have come across something of interest. Some intersections keep a green light on the main street and red on cross streets until a car pulls up. Before...

Not really a homework problem but related. In one of my homework problem, it says , Calculate the moments Mx and My and the center of mass of a lamina with density ρ = 4 and the given shape. Mx = 2 My = 12 (x, y) = (2,1/3 ) I got the answer. YOUR WELCOME. But, I only got it...

Homework Statement could someone please help me to answer the following problem: Suppose a wire 20 cm long is to be cut into two pieces. One piece is to be bent in the shape of an equatorial triangle and the other in the shape of a circle. How should the wire be cut so as to: a) maximize...

Hey all, while I've applied to several REUs for this summer, I've mostly been applying in areas that I'm only tangentially interested in. Last week, I received an email about a new REU that's opened up at Case, and was ecstatic to see the following research program: (T4) Phase transitions in the...

Any Korean here applied to MIT and got accepted? I'm applying next year and need some advice I would like to know what you guys' GPA and SAT was and what ur extra curricular (including volunteer and working) was It would be great to see what u guys wrote for your application essay

Homework Statement An ecologist studies the birds at Mai Po Nature Reserve. Only 21% of the birds are "residents", i.e. found throughout the year. The remaining birds are migrants. The ecologist suggests that the number N(t) of a certain species of migrants can be modeled by the function...

Homework Statement The monthly cost C(t) at time t of operating a certain machine in a factory can be modeled by C(t) = aebt-1 (0 < t <= 36), where t is in month and C(t) is in thousand dollars. The following table shows the values of C(t) when t = 1, 2, 3, 4. C(1) = 1.21; C(2) = 1.44...

Homework Statement A textile factory plans to install a weaving machine on 1st January 1995 to increase its production of cloth. The monthly output x (in km) of the machine, after t months, can be modeled by the function x = 100e^(-0.01t) - 65e^(-0.02t) - 35. (a)(i) In which month and...

Hi all, I have a project to do for system of ordinal differential equations and their applications in physics. One of my tasks is to find where in physics the following system of ordinal differential equations appear: dA1(x)/dx=f(x).A2(x) dA2(x)/dx=f(x).A1(x)+ h(x).A2(x)+ g(x).A3(x)...

I am looking for appliction of nuclear physics in agriculture. i have actually found that it is mostly used in Genetically modified crops. These are modified in order to allow them to resist to some change of climat or to adapt a certain region. My problem now is that i did not find used...

The 2003 Cadillac Deville is equipped with a DOHC 4.6 litre V8 engine rated at 275 horsepower. There is a lack of aftermarket support for the Northstar engine, so there are very few options i the way of performance improvements. I am of the understanding that any car can be turbocharged and...

Hello Fellow Physicists! I'm having trouble with a problem from a graduate course in Statistical Mechanics. It's a two part question; I've got the first part, it's the second part that's giving me trouble. The problem is about reversible/adiabatic processes, thinking of "reversible" as...

Homework Statement I am trying to type my assignment using latex but I am having problem. i first installed the WinEdt 5.6 and i tried typing into it and everything works except, when i press the Latex button at the top (in order to see my document whether its right or wrong) it gives an...

Hi all, When are the deadlines for PhD applications in the northern hemisphere?

I have a suspension arm that I am rebuilding, the main reason is to make it adjustable in length, and the other is to replace the ball joint. The original equipment is a standard automotive ball joint, greased and the shaft is 1 piece with the ball. The new setup would use a 5/8 spherical...

Since it appears that this is a recently discovered phenomena, it seems like there should be a lot of new applications that utilize it. Obviously the carts that use the wind to travel can move faster, but it seems like this idea can be used in other areas. I have a project for my engineering...

Should I list a publication if the paper has my name in there but I didn't actually write anything in the paper? (except producing some plots and results). Particularly when the professor just put my name there as a sort of "courtesy"? If so, how do I specify that I am not the primary author or...

I don`t know where to post this , i hope this is the right place. Colud you give me the names of windows application for math or physics.*i want just the names) , and a app to solve integrals.

Help me, I'm really confused coz the school system in the US is completely different from the one here in the UK.. watch this vid to explain what I'm saying...http://uk.youtube.com/watch?v=usq7h3n8GUw See, in the US, Students go to Universities in the age of 16...but here in the UK, when...

I am going to take GRE physics next October (or November). From what someone should begin with? Are the 1st year textbooks (like Serway's) useful, or one should study all the stuff from the advanced undergraduate texts (Griffiths' e/m, Goldstein's classical mech., Shankar's quantum mech...

Hello, my name is Mark Murphy. I've kept tabs on this forum for a while, and was hoping I might garner some advice regarding my curriculum. I am currently a third year at my university, majoring in Engineering Physics. Our Engineering Physics program differs from our Physics graduate school...

I'm having trouble with this question. The percent "P", of caffeine remaining in your bloodstream is related to the elapsed time, "t', in hours, by t = 5(log P/ log 0.5) a) How long will it take for the amount of caffeine to drop to 25% of the amount consumed? b) Suppose you drink a cup...