Comparison Definition and 378 Threads

Homework Statement Look at the diagram accompanying the question. Which has least C-H bond energy? The Attempt at a Solution On cleavage of a C-H bond, a carbanion is formed as carbon is more electronegative than hydrogen. So cleavage of (b) results in a carbanion stabilized by resonance

http://img205.imageshack.us/img205/5117/summation.jpg I think next step is: http://img205.imageshack.us/img205/7044/summation2.jpg but the questions are: how & why? why is that the next step? how do I solve such problems?\how do I choose the second part?

Hi All I'm looking for a table of Tcs and normal state resistivities for a selection of 'typical' superconductors. I'm sure such a thing must exist in literature, but I'm having trouble locating it. Specifically, I've just finished a dissertation project developing a measurement technique...

hi Is there any document about the difference between U235 and U238 properties?

Homework Statement Compare the deBroglie wavelength for an electron in the n=6 orbit of He+ compared to the n=2 orbit. Is the deBroglie wavelength the same, smaller, or larger? Derive this. Homework Equations Quantization of Paths of Electrons: 2 pi r = n (lambda) Bohr Radius: rn=n2 aB The...

I want to purchase a dental magneostrictive ultrasonic scaler. I need help with comparisons on technical specifications. Can anyone help me determine what is the best unit as far as output goes, if I give you the specifications? (Obviously I do not know electrical stuff - Just teeth)

Homework Statement (a) Let f,g: [a,b] \rightarrow \Re. Define: f \vee g(x) = max(f(x),g(x)), x\in [a,b] f \wedge g(x) = min(f(x),g(x)), x\in [a,b] (b) Let f_{+} = f\vee0, f_{-} = -(f\wedge0) Show that: f = f_{+} - f_{-} abs value of f = f_{+} + f_{-}...

hey guys I'm kind of stuck on this idea of the comparison test. i understand the process and how it is done but i don't seem to understand how to find the second series(typically called bn) to compare with the original. get what i mean? thanks! =)

I have been reading a paper which introduced classical mechanics concerning only one dimension. Before we get into anything about displacement and velocity, I read about dimensional analysis. There is a section of the paper which isn't very well explained and I hope someone can explain it to...

Homework Statement Which two of the three types of fields in the title of this are thread are the most similar? Provide supporting evidence? Homework Equations Gravitational: -Source: point mass -Field intensity proportional to: M/r^2 -Range: long range -Strength: weak -Direction of field...

How do GM crops (both current and potential in the near future) compare with organic in terms of output per acre? How does it compete with such methods as Fukuoka Natural Farming, and other forms of permaculture?

Hello, folks. This happens to be my first post here, and I've come with a question from a problem set in my textbook. Homework Statement Determine whether the following series converges or diverges. Give reasons for your answer. Homework Equations \sum^{\infty}_{n=2}...

I am trying to compare the fluid velocity given by the closed form solution and FEA analysis for fluid flowing through a channel that is 800u long and 100u wide. I am using the equation vmax= (gradP)*(radius)^2/(4*viscosity) I got 8.4cm/s in the former compared to ~10cm/s in the latter...

[SIZE="1"]Disclaimer: Although my question is targeted toward the UK, I do not wish to exclude comparison with other countries e.g. Germany or Canada. Please, if you have studied maths at universities in another country, your experience is of value and interest. [SIZE="2"]Here in the United...

Homework Statement For what values of p does the following integral converge or diverge? \int^{\infty}_{2}\frac{dx}{x[ln(x)]^{p}} The Attempt at a Solution I have graphed y=\frac{1}{x[ln(x)]^{p}} for different values of p (negative, zero, positive), and it looks as though in all...

If we think of two isolated systems, A and B, existing side by side, the proportion of the energy between those systems should always stay the same. Here is a thought, that I would like some comments on: System A contains a planet, and the advanced civilisation on this planet, have created...

Does anyone have any knowledge on these? I look at an example of a direct or limit comparison and i see what they are doing, but I have no idea how they got the "comprable" term... for example the sum (n = 1) to infinity n/(n^2 +1) you can use either test, but how do you choose what to...

I need to compare two ICE engines. I need to know the "work" of one compared to another. Let's say the first engine has a bore of 3'' and a sroke of 3" connecting rod 5.25. If you need cylinder presure,say PCP is 5000psi At 20 degrees ATDC and tapers to 800psi at 90 degrees ATDC. The second...

typedef struct Emp { unsigned char lname[MaxName + 1]; /* + 1 for '\0' */ unsigned char fname[MaxName + 1]; unsigned int id; unsigned char dept; bool married; } Emp; int comp1(const void* item1, const void* item2) { const Emp* emp1 = (const Emp*) item1; //emp1...

Hi everyone, I need your help badly. This may sound simple to everyone but I need to get the concept sorted out. For ratios, we know that it is a comparison between 2 or more quantities with the same units. My question is, can ratio be used to compare between say ingredients in a...

I am confused about the right formula for this. Is it R_{n} \leq T_{n} \leq \int_{n+1}^{\infty} or R_{n} \leq T_{n} \leq\int_{n}^{\infty} ? Say for example, I want to estimate the error in using the sum of the first 10 terms to approximate the sum of the series. The textbook seems to use...

I have been given the series sum 1/sqrt(3n-2) from n=1 to infinity I am supposed to use the limit comparison test, and the comparison series my book suggests is sum 1/sqrt n from n=1 to infinity, which I know is a divergent p series However, when I take the limit of one divided by the...

Hello everybody! I have a large set of items and, two-by-two, there exists some kind of attraction/repulsion that I have measured. I synthesize this information in a (nxn) matrix. Under different circumstances this attraction/repulsion changes. So, what kind of statistical/mathematical...

Hello everybody! I have a large set of items and, two-by-two, there exists some kind of attraction/repulsion that I have measured. Under different circumstances this attraction/repulsion changes. So, what kind of statistical/mathematical procedure can I use to measure whether the changes...

Not really a specific question, but I am really struggling with the comparison tests for infinite series. I just finished doing quite a few problems from the section. I went in pretty confident, but after completing the section I was bummed that I only did a less than a handful correctly. My...

I'm not sure where to post this one but i'll start with the mechanical guys first. There are two different motors that share identical ratings but different sizes physically. They are represented as though they perform the same work, share a common HP and KW rating and the mechanical device...

Is the same inductance formula valid for a coil made of hollow tubbing that for a solid wire made , with both having the same width?, and supposing that a high frequency current flows through it whats the skin effect influence on the result

Homework Statement is the series convergent or divergent. Sum from 2 to ∞ of 1/ [n(ln n)^.5] Homework Equations comparison test? The Attempt at a Solution Is it possible to use the comparison test for this problem. Also, could I compare this with something like: (1/[(ln n)^.5]...

Homework Statement Use the Comparison Theorem to determine whether the integral below is convergent or divergent: e^-x / sqrt x dx integrated from 0-->1 The Attempt at a Solution I think it is convergent because 1/e^x is convergent. I set the original integral less than or equal to the...

Homework Statement \sum\limits_{n = 2}^\infty {\frac{{\sqrt n }}{{n - 1}}} Homework Equations The Attempt at a Solution \begin{array}{l} a_n = \frac{{\sqrt n }}{{n - 1}},\,\,b_n = \frac{{\sqrt n }}{n} = \frac{{n^{1/2} }}{n} = \frac{1}{{n^{1/2} }}\,\,{\rm{is_ a_ p - series_...

[SOLVED] Comparison of sound waves in air and underwater Homework Statement In air, the human ear is most sensitive to sound waves of 3300Hz. The auditory canal is part of the human ear. It is a tube of length 0.025m, i.e. 1/4 the wavelength of sound with frequency 3300Hz. When under...

Just want to get some terminology right. Is TOE equivalent to QG? If so is QG more frequently used by physicsts as it sounds more professional or simply more logical?

Homework Statement Does xn converge (Sum from n=1 to infinity) of xn = 1/(n + SQRTn) Homework Equations Using comparision test The Attempt at a Solution I separted into fractions of 1/SQRTn - 1/(1 + SQRTn) and i know that both of these diverge since the power of n is less than...

Hi all, I have been looking for an answer to this and I cannot find one. So here is my question... The surface area of 57mm twin round throttle body set-up was 5100 mm^2 and the single 75mm throttle body set-up was 4415 mm^2. Now to the actual question... Does smaller (twin)...

Use the Comparisom Theorem to determine if f(x) = \int^{\infty}_{42} \frac{42+42^-x}{x}dx is convergent or divergent. I compared it to g(x)=\int^{\infty}_{42} \frac{1}{x}dx \int^{\infty}_{42} \frac{1}{x}dx = Lim_{t->\infty}\int^{t}_{42} \frac{1}{x}dx Take the antiderivative, and the limit...

Homework Statement The diagram shows two wires; wire 1 and wire 2. The charge carriers in wire 1 (of circular cross section and radius R) have a drift speed down the wire that is not constant across the wire. Instead, the drift speed rises linearly from zero at the circumference (r=R) to at...

Hello everyone, Could anyone please show me the appropriate formulas which I need for the following question? 1. How many times louder or softer than sound level of 40 dB is a sound at a) 68 dB? b) 0.3 dB? Thank you.

can anybody focus something on how pipes in parallel will work in comparison to the same pipes in series.i want to calculate pressure drop across 4 parallel pipes emerging from a tank & entering inside the other tank . pipes of sam dia,& same length. thnks

Homework Statement What are the differences between AC synchronous motors and AC asynchronous motors. Also, what are the simple and non technical differences between AC and DC motors. Homework Equations The Attempt at a Solution

Homework Statement First questions is: How to choose between using the ordinary comparison test, or using the limit comparison test? Homework Equations The Attempt at a Solution then, for these two problems below, i decide to use the limit comparison test: SUM n_infinity...

anyone who has a pool heater? or knows how they are installed? if yes...please let me know what is the power rating of the pool heater and what size the pool is..i need it for comparison issues. (power in BTU/Hr, kW, J/s...) thnx Elie

Homework Statement Use the box and the behavior of rational and exponential functions as x \rightarrow \infty to predict whether the integrals converge or diverge. Here is the box: \int^\infty_1 \frac{1}{x^p} dx converges for p > 1 and diverges for p < 1. \int^1_0 \frac{1}{x^p} dx...

Homework Statement Use the box and the behavior of rational and exponential functions as x \rightarrow \infty to predict whether the integrals converge or diverge. Here is the box: \int^\infty_1 \frac{1}{x^p} dx converges for p > 1 and diverges for p < 1. \int^1_0 \frac{1}{x^p} dx...

Homework Statement heres the equations: http://img407.imageshack.us/img407/738/untitledzk8.jpg there are two equations, a and b. Homework Equations 3/n^2 for a, and 1/n for b. The Attempt at a Solution Using the limit comparison test, i don't understand why to use 3/n^2...

Hi all, Is it 100% sure that students graduated from great universities like UC Berkeley or Stanford are much more qualified than those from normal State Universities? Is it 100% sure that alumni of great universities are much more likely to become famous such as inventors or...

What do you guys in general think will prove to be more difficult in terms of workload: Introductory Macroeconomics Introductory Biology Introductory Chemistry Between Intro to Bio and Intro to Chem, which one would be harder? Note that one of these courses will be used so that I can take 20...

cin or scanf? i use cin from iostream.h in c++ i also knowabout scanf in stdio.h but which is better? What is the difference betweeen the both? -benny

Sir, It is said that a hollow sphere cools faster that a solid sphere. Is it because a hollow sphere contains smaller quantity of heat than the solid sphere? Or is it because the rate of heat loss is inversely proportional to thickness of the conductor through which heat is lost?

In Homer's Odyssey, Odyssius has to deal with the seduction of eternal life with lots of women, but choses to go back home to his wife and son; this is what I got from watching it on sci-fi; I've yet to bye the time to read it myself even though I bought the Homer works awhile ago, but thumbing...

Hello, Do you know a website which has established a comparison between all spectrometry techniques like SAAF, ICP, SAAE, ICP-MS, LA-ICP-MS etc... concerning the nature of the analysis, the concentration domain, the nature of radiation and the main principle. thank you very much Bibinou