Factors Definition and 411 Threads

Homework Statement y' + 2ty = t^3 Homework Equations Integrating factors and variation of parameters The Attempt at a Solution Ive solved for m M = e^{\int 2t\,dx} M = e^t^2 (this is e^t^2, but doesn't look like it in latex) I multiplied both sides by M (e^t^2)(y') + (e^t^2)(2ty) =...

Is there a way other than trial and error to tell whether an integrating factor h is a function of x only, y only, or of x and y?

Intensity of Light-- What factors contribute? What factors affect the intensity of light? What is intensity? Are the relationships or equations that link the intensity of light to other variables? I'm asking this because I'm not quite understanding intensity vs. frequency. I'm studying the...

I can't solve this problem, can u ? We have this crane hook which has a force F=3000dN pulling it down and we have to calculate a few designing elements look to the section and calculate the safety factors for: 1. the crane hook (part No. 5 )at the section A-A and B-B . 2. the hook trunion...

Could anyone please tell me any factors affectin the spring constant k of a spring ?

urgent: stress-concentration factors Hey people, I urgently need a chart of theoretical stress-concentration factors for the following general case: a part made from two thin plates of equal weidth connected parallel to each other with one shorter than the other. I need the theoretical...

Homework Statement Design and complete an investigation to determine how the following factors affect the force of friction: weight surface are speed Homework Equations The magnitude of the force that is provided by an elastic band is directly related to the distance the elastic...

Given that x^5 - 2x^4 + 2x^3 - 4x^2 - 3x + 6 is exactly divisible by x^2 + 3, find the remaining real factors of the polynomial. __________________ I could easily do that question using a calculator, just by graphing it and finding the roots. Another thing i can do is multiply the...

Hi Guys, a quick answer will be great! Just wanting to know, what are some of the factors that affect the voltage of a galvanic cell?

Homework Statement I am responsible for coming up with an experiment to determine how the following 3 factors affect the force of friction: weight, surface area and speed. The directions given inlcude: "You will need to measure the magnitude of the force of friction. Since the...

Homework Statement solve the following equation using method of intergrating factors: Homework Equations dy/dx = y + cosx - sinx The Attempt at a Solution i think i have to get it in the form dy/dx + r(x)y = f(x) but i can't see how, if i multiply or divide by a factor i...

Find the two integrals: \int_0^{\infty}\frac{e^{-\alpha x^2}}{x^2+1}\sin(\alpha x) \, dx \int_0^{\infty}e^{-\beta^2t}\cos(\beta x) \, d\beta Any hint?

It's the question for my science fair report.

Suppose you have an equation: M(x,y) dx + N(x,y) dy = 0 I have heard that there always exists an integrating factor u(x,y) such that the partial derivative of uM with respect to y equals the partial derivative of uN with respect to x. But somewhere in the back of my mind I remember that...

For every pair (a,b) of factors that equal the trangular number m(m+1)/2 there are two distinct sets of pairs (c,d) that form a determinant equal to 2m+1 such that the products (a+cn)*(b+dn) = a triangular number for all n. Is this a previously known fact and how can it be prooved?

This is my physics coursework task and although I have had only minor difficulties in actually doing the work, I thought I would post some of the things that I found to verify. Basically, I began with saying that the initial speed (u), initial height (h), gravitational constant (g) and the...

Find all positive integers n (n will be called special) such that if n divides a three digit number say ABC where A = hundreds, B = tens, C = ones. Then n also divides BCA and CAB. So far I have worked out that 1 is special of course, so is 3 (factor test sum of digits will always be the...

Hi i want to learn about the K factor that is used in the wireless communications and i used to denote the curvature of earth... Do u know where i can find information about it? Any good links about wireless communications aspects...such as antennas, radiation ...et.c.

I noted the following relation for the form F_{n} = n^{2}-3n+1 let p_n be any whole factor of F_n and p_{n}^{'} be the quotient. The following relation then holds [tex]\frac{F_{n}}{p} * \frac{F_{(n+p)}}{p} = F_{(n+p_{n}^{'})} A trivial example would be to let p = 1. Then [tex] F_{n} *...

I need a table that i can easily find the ways to convert any unit to any other unit i want for example i have 589348cm and i want to change it to Tm i need a table that will easily show me the conversion factor

It is easy to show that for all odd x that: (x^n-2) = 7 (mod 8) but why are the factors of above either congruent 1 or 7 modula 8, i.e factor(x^n-2) = {1,7} (mod 8) can anyone give me a hint. regards Anton

I have been working on constructing a method to factor composite numbers composed of two odd prime numbers a and b. As a result, I have been experimenting numerically with various patterns to see if I could find some patterns that would reveal information about composites of two prime numbers...

A nice tutorial by E.J. ROSCHKE PROPULSION DIVISION JET PROPULSION LABORATORY, Caltech. http://www.its.caltech.edu/~culick/Roschke.pdf

how to calculate the number of prime factors of 360? please give the method

Hi, I've got this particular polynomial a^{3/2}+x^{3/2} and I need to factorize it as far as possible. I've come to the conclusion that there are no factors. Am I wrong?

Hi, I"m working on my math history class project. I choose a topic to discuss about Theory of Ideal Prime Factors by Ernst Eduard Kummer. (1847). I read the material few times, but I don't get an understand of the basic idea how he can come up this theory. Can someone explain it in a...

Which factors have the most important role on one's personality and how? Genes or environment? Is it true that many of criminals and indecent people had a difficult childhood and have grown up in an indecent family? And what's your defenition of a decent and indecent family?

I am looking for some ideas about this one. I use B actin as the normalizator in my western blot. i use different dilution factors of the B actin antibody. For some samples i use 500X and for others i use 1000X. I wonder when i normalize my samples and calculate the relative expression levels...

how do you spot that a D.E. needs an integrating factor, besides experience?

I have been tasked with a physics project at school, to investigate what factors affect the resonating frequency of a piece of wire. We arent told anything about the experiment, its a kind of research on your own thing. I know that the resonating part means the frequency at which the piece of...

Hi! How do I determine the number of distinct factors of a number, say, 2520? 2520 = 2*2*2*3*3*5*7 So we've 8 different primes. The number of combinations of those is, according to me: C(8,1)+C(8,2)+...+C(8,8)=155 (I think, calculated it by hand; but it isn't important) Obviously those...

create a method to find the factors of any real number ? and then use it to find the factors of 45000 ?

I am going to be gone all day tomorrow at a conference track meet and am unable to ask my teacher how to do integrating factors and differential operators. I leave tomorrow at 9:15 am and was hoping to have some examples to take with me to study. If someone could help me walk through a these...

Apparently In optical spectroscopy it is common to use the unit cm^-1 tro define the energy (or frequency of a photon that is emitted or absorbed in a transition between electronic states of an atom. This is derived from the reciprocal of the wavelength of the photon (wavelength in cm)...

..besides grades do graduate schools and jobs you apply for look at? I' m not going to have a 4.0...most likely a 3.0 or around that area. What other factors matter? Thank you. :smile:

I'm trying to get an expression for the nth term in this series: c_1 = 1 c_n = \sum_{k=1}^{n-1} \frac{c_n}{(n-k)!} For example: c_2 = 1/1! = 1 c_3 = 1/2! +1/1! = 3/2 c_4 = 1/3! + 1/2! + 3/(2\cdot 1!) = 13/6 etc. Since the factor in front of each term is different in each...

Hello everyone Can anybody could please help me in the pendulums? i just wanted to know how a simple pendulum executes simple harmonic motion and what are the factors that could affect the time period of a simple pendulum

premise : i do not know all the factors determining a game's outcome conclusion : i do not know the outcome of the game between Man U and Milan tonight i want to ask 1. What kind of argument is the above? (is it a deductive argument?) 2. How good it is?

What are the factors that govern the diffraction of electromagnetic waves. Why is it that ordinary light diffracts so much while laser is so precise. Does it have to do something with the monochromatic character of laser?

Can someone give me some examples of factors that affect the performance of ribbon cable please.

I'm currently a sophomore in college and still have not declared a major to pursue. The problem is that I cannot decide which factors in my decision making should bare the most importance in my final decision. There are so many things in life that interest me; however, a lot of the things that...

Mutation is one of the important factors to cause evolution, but besides radiation, what cause mutation to happen? Is it happen naturally?

Can someone help me with this? What volume, cm³, would 36.25g of C_4H_1_0 occupy at 85.20 kPa and 108 celsius? So I am assuming i should use the ideal gas equation, PV = nRT, and isolate V so i get: V=\frac{nRT}{P} heres where I am stuck, how do i solve for "n" when only...

How can you improve the percent yield of an experiment? I'm not even sure what affects the percent yield. Please help.

Hi! All, Here's a specific question I need to address in a Microarray project. 1) Different companies have oligos (oligonucletides) with different lengths. My understanding is, the oligo length should be sample specific. However a glance at company websites tells me that each one has come...

Ok, I posted this in the software forum a this afternoon, but I guess all the java gurus are on vacation. So I thought I'd post it here. This is my problem: Ok, I have a new problem. This time I'm trying to make a program that prints all the prime factors of a given number and the 29...

Hi! I'm new to those forums, so I just want to say "Hello everbody!". To my question: How can I simplify \frac{\frac{1}{x+\Delta x}-\frac{1}{x}+ \frac{1}{x^2}\Delta x}{\Delta x} I've spent some hours on google, but no result. Just tell me the name of the method and I'm really gratefull!

Find a whole number for which the sum of its two largest factors is 340. pls offer help ... what method can i use to slove such a problem??

i don't even know where to start and i hate series. if someone could get me stared that would be great help. thanks The terms of this series are reciprocals of positive integers whose only prime factors are 2s and 3s: 1+1/2+1/3+1/4+1/6+1/8+1/9+1/12+... Show that this series converges...

The terms of this series are reciprocals of positive integers whose only prime factors are 2s and 3s: 1+1/2+1/3+1/4+1/6+1/8+1/9+1/12+... Show that this series converges and find its sum. this is my first time writing here. i hope someone can help me with this question.