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Representation of a Solution of the Cauchy Problem for an Oscillating System with Multiple Delays and Pairwise Permutable Matrices Abstract and Applied Analysis Volume 2013 (2013), Article ID 931493, 10 pages http://dx.doi.org/10.1155/2013/931493 Research Article Representation of a Solution of the Cauchy Problem for...
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population model, so confused June 9th 2009, 03:41 PM #1 Newbie Joined May 2009 Posts 7 population model, so confused h, a constant. dN/dt=rN(1-(alpha)*(N))-h r,h,alpha +ve constants 1.)assume r>4h(alpha).find and classify the steady states N_1 and N_2 where N_1<N_2. I can find steady...
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Stats: proving an equality with summations February 2nd 2009, 09:41 AM #1 Stats: proving an equality with summations Spent several hours trying to prove this, and now my eyes are swimming :/ I need to show that: $ns^2_{n+1} = (n-1)s^2_n + \frac{n}{n+1}(x_{n+1} - \bar{x}_n)^2$ where $\bar{x}$ is the mean...
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implicit differentiation help December 8th 2009, 10:17 PM #1 Junior Member Joined Oct 2009 Posts 72 implicit differentiation help A curve is defined implicitly by the equation $x^3 + y^3 = 6xy$ a)Using Implicit Differentiation b)Determine the location of each point on the curve whose tangen...
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Short Circuit Capacity: Basic Calculations and Transformer Sizing Need a transformer? Medium Voltage Cast Resin and Oil Immersed are available here Short Circuit Capacity: Basic Calculations and Transformer Sizing Copyright © 2001 Francis J. Martino Short circuit capacity calculation is used for many application...
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Math Help June 6th 2007, 04:38 AM #1 Newbie Joined Jun 2007 Posts 9 triangle PQR is a right triangle in the Cartesain plane with right angle at R.P = (-2,1), Q = (4,3) and R lies vertically above P. the midpoint of PQ is M. WHITCH ONE OF THE FOLLOWING IS/ARE TRUE? A. R=(-2,3) B. M=(1,2) ...
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Riemman Sum The limit as x approches infinity of the sum from i=1 to n of : $(1+\frac{i}{n})^3$ $\lim_{n\rightarrow\infty}\sum_{i=1}^n(1+\frac{i}{n })^3$ = $\lim_{n\rightarrow\infty}\sum_{i=1}^n\frac1{n^3}(n ^3+3n^2i+3ni^2+i^3)$= $\lim_{n\rightarrow\infty} 1+\frac3n\sum_{i=1}^ni+\frac3{n^2}\ sum_{i=1}^ni^2+ \frac3{n^3...
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Posts from September 2011 on Code and Football The latest and greatest. I’m still curious how deep into the season we’ll get before the optimal pythagorean exponent will fall below 3. Oakland, for now, is the SRS leader because of an exceptional strength of schedule. I can now calculate a Homemade Sagarin, but not hap...
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Patente US20040083082 - Iterative detection in MIMO systems CROSS-REFERENCE TO RELATED APPLICATIONS [0001] Priority is claimed from provisional applications: appl. Ser. Nos. 06/395,604, filed Jul. 12, 2002, and 06/399,746, filed Jul. 30, 2002. The following copending applications disclose related subject matter and ha...
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Diagonalise Symmetric Matrix. May 17th 2008, 09:08 PM pearlyc Diagonalise Symmetric Matrix. Diagonalise, $A$ = $\left[ \begin{array}{cccc} -2 & -1 & 0 \\ -1 & 0 & 1 \\ 0 & 1 & 2 \end{array}\right]$ That is find matrices P and D, where D is diagonal such that P-1 AP = D May 17th 2008, 09:15 PM I...
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Math Help November 18th 2012, 10:03 PM #1 Newbie Joined Nov 2012 From US Posts 5 Proofs -_____- Can anyone help me prove the following? Suppose S is a set of numbers which contain exactly one element, then S is closed. Re: Proofs -_____- I'm not sure i understand the question. Do you mean...
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Non-uniform inertia 1. The problem statement, all variables and given/known data A cylinder with radius R and mass M has density that increases linearly with radial distance r from the cylinder axis, ie. [itex]\rho[/itex]=[itex]\rho[/itex][itex]_{0}[/itex](r/R), where [itex]\rho [/itex][itex]_{0}[/itex] is a positive ...
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Math Help September 11th 2008, 05:47 AM #1 Newbie Joined Sep 2008 Posts 4 GCD Hi, I am a little confused on this problem. Please help!! Assuming gcd(a,b)=1, prove that gcd(a+b, a^2+b^2)=1 or 2 So far I know a^2 + b^2= (a+b)(a-b)+2b^2 Let $d$ be a (positive) common divider of $a^2+b^2$ and...
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Self-organizing Mechanism for Development of Space-filling Neuronal Dendrites Abstract Neurons develop distinctive dendritic morphologies to receive and process information. Previous experiments showed that competitive dendro-dendritic interactions play critical roles in shaping dendrites of the space-filling type, wh...
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Project Euler Problem 89 Problem 89 was kind of fun: we needed to convert some sloppily written roman-numerals into their more efficient, minimal representations. There are two tricks to doing this easily: 1. When converting from roman numerals to decimal digits, it is simplest to process the roman numeral from righ...
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Multiplication/division of matrices and vectors Jhenrique 1) Let A a square matrix, x a colum vector and b another colum vector. So, I want solve for x the following equation: Ax=b So: x=b÷A = b×A^-1 And this is the answer! Or would be this the correct answer x = A^-1×b ? First of all, you shouldn't use the divisio...
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An introduction to fractals An Introduction to Fractals Definition Fractal Dimensions Example: Calculate Fractal Dimension How Long is the Coast of Britian? ...
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Patent US7761233 - Apparatus and method for measuring the accurate position of moving objects in an indoor environment FIELD OF INVENTION The instant invention relates to an apparatus and method for measuring the accurate position of moving objects in an indoor environment. BACKGROUND OF THE INVENTION Location sensi...
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Patent US7908641 - Modular exponentiation with randomized exponent CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation of co-pending International Application No. PCT/EP04/00522, filed Jan. 22, 2004, which designated the United States and was not published in English and is incorporated herein by...
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Proving (1+x1.t)(1+x2.t)...(1+xn.t)>=(1+t)^n. Let x1,x2,...,xn be positive numbers satisfying (x1)(x2)(x3)...(xn)=1. Show that for any t>=0, (1+x1.t)(1+x2.t)...(1+xn.t)>=(1+t)^n. Last edited by mr fantastic; March 7th 2011 at 10:33 AM. Reason: Re-titled. We can show that $\dfrac{\left(1+\frac t{x_i}\right)(1+tx_i)}{(...
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Why it's not equal? October 9th 2013, 07:49 AM Mengqi Why it's not equal? HI all, I encountered an integral $\gamma(x,t)=\pi^{-0.5} \frac{x}{2} \int^t_0 t'^{-\frac{3}{2}} e^{-\frac{x^2}{4t'}} dt' = -\frac{2}{\sqrt{\pi}} \int^t_0 e^{-(\frac{x}{2\sqrt{t'}})^2} d \frac{x}{2\sqrt{t'}} = \frac{2}{\sqrt{\ ...
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Implicit Differentiation September 29th 2012, 06:25 AM kspkido Implicit Differentiation I've tried differentiating this over again, and took me a while to get it. but Im not sure, my answer were (1/3, 4/3) heres the question At what point on the curve xy=(1-x-y)^2 is the tangent line parallel to the x-a...
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rationalize expressions September 29th 2007, 11:16 AM #1 Newbie Joined Sep 2007 Posts 9 rationalize expressions hi i was wondering if any one can help me rationalize these four expressions and if possible show working out so i can understand better, thanks in advance. 1) 8_ √2 2) 16...
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Some calculus problems in the assignment of Calculus 1 course June 25th 2010, 06:53 PM #1 Newbie Joined Jun 2010 Posts 1 Some calculus problems in the assignment of Calculus 1 course 1) a) show that e^x >= 1 + x for x>=0 b) deduce that e^x >= 1 + x + 1/2 x^2 for x >= 0 c) use mathematical inducti...
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Current carrying wire and induced electric field within the wire So I just had an exam and I'm so unsure about this problem. It seems that I got it right, but I could be completely wrong. XD 1. The problem statement, all variables and given/known data A long, straight current-carrying wire carries an increasing curre...
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Numerical Solution of a Kind of Fractional Parabolic Equations via Two Difference Schemes Abstract and Applied Analysis Volume 2013 (2013), Article ID 828764, 8 pages http://dx.doi.org/10.1155/2013/828764 Research Article Numerical Solution of a Kind of Fractional Parabolic Equations via Two Difference Schemes ^1Ins...
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Physics Forums - Correction on 9.73 Statistics on Large Sample Tests of Hypotheses? Little Bear Oct13-07 02:28 PM Correction on 9.73 Statistics on Large Sample Tests of Hypotheses? 1. The problem statement, all variables and given/known data (I forgot to write out the problem statement in previous post) How do C...
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Patent US6240141 - Lower-complexity peak-to-average reduction using intermediate-result subset sign-inversion for DSL RELATED APPLICATIONS Provisional applications, Ser. No. 60/084,895 filed May 9, 1998, and Ser. No. 60/094,734 filed Jul. 31, 1998 have been filed on this application. FIELD OF THE INVENTION This inve...
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Forces of interest September 1st 2009, 06:33 PM tbl9301 Forces of interest Tawny makes a deposit into a bank account that credits interest at a nominal interest rate of 10% per year, compounded semiannually. At the same time, Fabio deposits 1000 into a different bank account, which is credited with simple in...
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Check my working please. August 14th 2009, 01:54 AM #1 Member Joined Jul 2009 Posts 149 Check my working please. Differentiate these. $y = \frac{1}{\sqrt{1-5x^2}}$ $=(1-5x^2)^\frac{-1}{2}$ $=-\frac{1}{2} (1-5x^2)^\frac{-3}{2} (-10x)$ $=\frac{5x}{\sqrt{(x^2-5)}^3}$ Next $y =...
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Nonlinear Differential Equation October 13th 2012, 04:32 PM #1 Nonlinear Differential Equation The Question is: Solve the following equation. The constant $\mu$ is non negative and $h$ is greater than zero. ${ ( \frac{dr}{dt} ) }^2 = \frac{2\mu}{r} + 2h$ Any help would be apperciated as I'm not ent...
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Complex Circle Geometry May 23rd 2009, 09:08 AM #1 Newbie Joined Jan 2009 Posts 18 Complex Circle Geometry I am trying to show that the points 1, a,−(a*), 1/a in the complex plane lie on a circle. Where a* is the conjugate of a. I know that given four points A,B,C,D then they lie on a circle iff ...
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Product rule in terms of implicit differentiation October 5th 2009, 07:11 AM #1 Banned Joined Sep 2009 Posts 35 Product rule in terms of implicit differentiation 1) x^2 + xy - y^2 = 4 x^2 + x*y(x) - y(x)^2 = 4 I understand this much: 2x + ____ + 2y*(dy/dx) = 0 But I don't understand how to d...
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Advanced Probability Help!!! April 16th 2008, 02:46 PM #1 Junior Member Joined Apr 2008 Posts 40 Advanced Probability Help!!! Peter was given n one-dollar scratch tickets, each winning: $2 with probability 1/8 $10 ------------- 1/100 $1000 ----------- 1/10,000 $20000 ---------- 1/1,000,0...
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On the Self-Intersection Local Time of Subfractional Brownian Motion Abstract and Applied Analysis Volume 2012 (2012), Article ID 414195, 27 pages http://dx.doi.org/10.1155/2012/414195 Research Article On the Self-Intersection Local Time of Subfractional Brownian Motion ^1School of Mathematics and Statistics, Nanjin...
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IVP -variation of parameters November 3rd 2009, 01:19 PM matlabnoob IVP -variation of parameters ok so here is my *big* problem im stuck on..=[ thank you for your time reading this dx/dt + x/t - 1 = t^2 ; x(1) = 1 using variation of paramter i did all this: dx/dt + x/t = t^2 + 1 dx/dt+ x...
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Conic Equation May 11th 2010, 11:35 PM #1 Member Joined Jan 2010 Posts 142 Conic Equation Can you help me prove if true or false please: True or False? Every system of two conic equations whose xy-term is nonexistent has at most 4 points of intersection. graph is not a proof. Thanks! Hello...
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[SOLVED] calc2 major help please! September 30th 2008, 06:20 PM #1 Member Joined Apr 2008 Posts 171 [SOLVED] calc2 major help please! ok so basically we are doing lengths and planes of curves.. i m lost to how the solution manual gets this.. the get: f '(x) = x (x^2 + 2)^ 1/2 = integral ...
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Patent US5457805 - Microcomputer enabling high speed execution of product-sum operation BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microcomputer, and particularly relates to a microcomputer having a product-sum operation instruction which repeats multiplication and additi...
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Partial Fractions Question Hi Need help on the following questions: 1) Resolve into partial fractions: $\frac{x^2-x+1}{(4x^2-1)(x-2)}$ This is what i have done: $\frac{x^2-x+1}{(4x^2-1)(x-2)}$ => $\frac{x^2-x+1}{(x-2)(2x-1)(2x+1)}$ $\frac{A}{(x-2)}+\frac{B}{(2x-1)}+\frac{C}{(2x+1)}$ $A(2x...
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Find eq. to ellipse November 3rd 2006, 10:17 AM viet Find eq. to ellipse Find the equation of the line that is tangent to the ellipse b^2x^2 + a^2y^2 = a^2b^2 in the first quadrant and forms with the coodiante axes the triangle with smallest possible area (a and b are positive constants) im not sure how...
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Perpendicular line equation! December 12th 2009, 12:20 PM #1 Newbie Joined Dec 2009 Posts 4 Hi There! Was hoping for some help. Set up an equation for the line (2,3) which is perpendicular to the line (2, -1) and (-1.-3). Don't understand this at all. Can someone please help me?! Thx! ...
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What is the latest on the Group Extension Problem? lugita15 Good one. OK, can you tell me the general conditions in which extensions are split or not split, or equivalently the conditions under which they are semidirect products or not? And do you know anything about the current state of knowledge concerning the ge...
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Speed of skydiver If a person has reached terminal velocity (say 50m/s), and he opens his parachute, and I want to find his speed 2 seconds after he opens his parachute, can I do this? Solve the equation m dv/dt = mg - kv^2 and substitute k with 1/2 pCdA and substitute the value for p, Cd, and A to find velocity? If ...
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Patent US7266579 - Combined polynomial and natural multiplier architecture TECHNICAL FIELD The present invention relates to semiconductor integrated circuit architectures, in particular multiplication circuits. BACKGROUND ART Multiplication hardware is usually adapted to carry out natural multiplication (the normal ...
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Working with moving pulleys A pulley system may comprise of smaller component pulley systems. Take the case of a pulley system, which consists of two component pulley systems (“B” and “C”) as shown in the figure. Figure 1: The pulley system comprises of two component pulley systems. Mixed pulley system T...
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of a Two-Language Competitive Model with Control Strategies Mathematical Problems in Engineering Volume 2013 (2013), Article ID 654619, 13 pages http://dx.doi.org/10.1155/2013/654619 Research Article Dynamic Analysis of a Two-Language Competitive Model with Control Strategies ^1College of Mathematics and Systems Sc...
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Log equation is this correct? 10^(1-x) = 6 ^(x) I got: log10 / log6 + log10 = x or x = .562 Last edited by needhelp75; December 16th 2008 at 11:14 PM. $10^{1-x} = 6^x$ $\Rightarrow \frac{10^1}{10^x} = 6^x$ $\Rightarrow 10 = 6^x \times 10^x$ $\Rightarrow 10 = 60^x$ $\Rightarrow x\ln60 = \ln 10$ $\Rightarrow x = \frac{...
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Physics Forums - (special relativity)Trajectory under constant ordinary force hoyung711 May11-10 12:27 AM (special relativity)Trajectory under constant ordinary force 1. The problem statement, all variables and given/known data A particle is subject to a constant force F on +x direction. At t = 0, it is located...
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Radian Question. January 13th 2011, 02:02 PM Mike012 Radian Question. Just got done reading the chapter... Want to make sure I have this right.... IF Circumference = 2(pi)r Let cir = 360 deg. So that 360 deg = 2(pi)r And 180 deg = (pi)r IF r = 10 then 180 = (pi)10 Hence half of a ...
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Definite integral question March 3rd 2013, 09:44 PM #1 Member Joined Dec 2012 From NY Posts 105 Thanks 1 Definite integral question Integral from 0 to 1 (1-x)^9 I did u substitution u=1-x du=-1dx du/-1 =dx get new intervals 1-1=0 1-0=1 -1 integral u^9 du -1 ...
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Inverse Rotation Matrix October 31st 2010, 11:05 AM #1 Newbie Joined Oct 2010 Posts 8 Inverse Rotation Matrix Hi, I'm totally new to this forum so please forgive me if I'm posting this in a wrong folder. I'm working on robotics and I'm currently running in to some rotation problems which kinda run o...
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mgf of a discrete random variable October 18th 2009, 07:44 AM #1 Member Joined Mar 2009 Posts 133 mgf of a discrete random variable A discrete random variable has pdf $p(y)=bk^y, y=0,1,2,...$ Find Y's mgf $m(t)$ generally. I get a bit stuck on what to do.. I know that $m(t)=E(e^{ty})$ so...
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Math Help Find the value of x, y, and z reduced to the simplest radical form. ok, because i ws wondering what x, y, and z are you talking about? so by Pythagoras' theorem: x = sqrt(y^2 - 4^2) and also x = sqrt(z^2 - 2^2) => sqrt(y^2 - 4^2) = sqrt(z^2 - 2^2) => y^2 - 16 = z^2 - 4 => y^2 - z^2 = 12 ..................(1...
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colouring vertices in graph theory December 1st 2009, 09:44 PM #1 Newbie Joined Nov 2009 Posts 11 Compare the upper bound for the chromatic number given by Brooks' theorem with the correct value for i) the Petersen Graph ii) the k-cube Qk the answer is: i) upper bound = 3, chromatic numb...
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How to interpret physically the divergence of vector field? hanson ... but I find no clue why the divergence of an electric field measures the charge denity? Can anyone tell me how to interpret the divergence of a vector field? Please kindly help. as other's pointed out, this has to do with Gauss's Law. it is a di...
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Matrix/basis question December 22nd 2010, 12:09 PM worc3247 Matrix/basis question I can see that this is true but I am having trouble presenting a convincing argument. Let V = $M_{n\times n} (\mathbb{R})$. Show that V has a basis with the property that each matrix in the basis is either symmetric or skew sym...
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Find the extrema of a trigonometric function November 15th 2009, 08:20 AM #1 Junior Member Joined Apr 2009 Posts 37 Find the extrema of a trigonometric function I am to find the extrema of the following function. f(x) = 2 sin x + cos 2x when 0 < x < 2pi. taking the derivative of the function I come up wi...
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Taylor serie of a function 1/(1+Z^2) Okay, do you have a [b]question[/b}? What do you want to know about that function? If you are asking about how to get that series, you could, of course, find the derivatives of that function, and apply the usual formula for Taylor's series. However, for this particular function, t...
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Quadratic questions : rational roots problem March 30th 2009, 11:37 AM #1 Member Joined Nov 2008 Posts 171 Quadratic questions : rational roots problem consider a quadratic equation (a+c-b)x^2 + 2cx + (b+c-a) = 0, where a,b,c are distinct real numbers and a+b-c is not equal to 0. Suppose that both the ro...
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Feynman's Calculus murshid_islam Feynman wrote in his book ‘Surely You’re Joking, Mr. Feynman!’: “That book [Advanced Calculus, by Woods] also showed how to differentiate parameters under the integral sign – it’s a certain operation. It turns out that’s not taught very much in the universities; they don’t emphasize i...
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directional derivative q ok so heres the question: find the directional derivative of the function f(x,y,z)=xy+yz+zx at the P(3,-3,4) in the direction of Q(7,1,7)... Here's what I have done: found partial derivatives and added them to give the gradient (y+z)i+(x+z)j+(y+x)k plugging in P gives: (-3+4...
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Derivative of y = sin x * cos x I'm working through Kline's Calculus book, and am at the chapter on Integration on Differentiation of Trig Functions. A question asks to find the derivative of: (I've labeled all equations for easy reference) (1) y = sin x * cos x unlike the solution guide which advocates using the pr...
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Linear first order differential equations I need to solve the equation: x (dy/dx) + 5y = 7x where y(1) = 7/2 The correct answer i have recieved is y = 7/6 (x + 2x^-5) How do i get to this answer? Ive been given this as a hint: x (dy/dx) + ay = bx^n can be simplified by multiplying both sides...
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A Diary of Numbers Long before we had cars we had horse drawn carriages. Doesn’t this mean that we should also have had bird drawn planes? How many pigeons would it take to carry a 747? According to Wikipedia, the Boeing 747 has a maximum take-off weight of 442,000 kg (~975,000 lbs). Since birds build nests, we know ...
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show compactness September 20th 2011, 09:12 PM #1 Member Joined Dec 2008 Posts 154 show compactness Let $\mathbf{X}$= $L^2(\mathbf{N})$= $\{\ x=\{\ x_n \}\ | \sum_{n=1} ^\infty = x_n ^2 < \infty \}$, $\| x \| = ( \sum_{n=1} ^\infty x _n ^2 )^{1/2}$ and $\mathbf{K} \subset \math{X}$ be closed and boun...
5
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System of linear equations May 9th 2012, 03:50 PM #1 Junior Member Joined May 2012 From NH Posts 26 System of linear equations Find all solutions to the following system of linear equations: (x1) – 2(x2) – (x3)+(x4)=1 2(x1) – 3(x2) + (x3) – (x4)=6 3(x1) – 3(x2) + 6(x3))=15 (x1) + 5(x3...
5
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Finite Element Modeling of a Piezoelectric Composite Beam and Comparative Performance Study of Piezoelectric Materials for Voltage Generation ISRN Materials Science Volume 2012 (2012), Article ID 921361, 11 pages http://dx.doi.org/10.5402/2012/921361 Research Article Finite Element Modeling of a Piezoelectric Composi...
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Triangle November 23rd 2010, 10:02 AM Veronica1999 Triangle In triangle ABC, angle C is a right angle and CB>CA. Point D is located on BC so that angle CAD is twice angle DAB. If AC/AD = 2/3, then CD/BD = m/n, where m and n are relatively prime positive integers. Find m+n All I have is the sketch. I...
4
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Prove a group is isomorphic to another February 8th 2010, 07:34 AM #1 Newbie Joined Feb 2010 Posts 14 Prove a group is isomorphic to another Let $G$ and $H$ be groups and let [tex] G^\star [tex] be the subset of $G X H$ consisting of all $(a, e)$ with $a \in G$ Show the following: 1. $G^\star \...
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Patent US4882758 - Method for extracting formant frequencies BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extracting formant frequencies from vowels or voiced consonants of a speech sound. 2. Description of the Prior Art It is known that the formant frequency i...
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Zero-Divisor Graphs with respect to Ideals in Noncommutative Rings ISRN Discrete Mathematics VolumeΒ 2011Β (2011), Article IDΒ 459547, 7 pages http://dx.doi.org/10.5402/2011/459547 Research Article Zero-Divisor Graphs with respect to Ideals in Noncommutative Rings ^1Department of Mathematics, University of Guilan, P...
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Patente US5237523 - Flowmeter fluid composition and temperature correction CROSS REFERENCE TO RELATED APPLICATION Reference is made to copending allowed application Ser. No. 07/285,897 filed Dec. 16, 1988 , now U.S. Pat. No. 4,961,348 issued Oct. 9, 1990 and assigned to the common assignee of the present application. ...
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hypothesis test for mean less than number April 6th 2011, 07:33 AM Caption12 hypothesis test for mean less than number a sample of 16 egg is take froom normal disribution. variance is unknown sample mean xbar is 4.49 and sample st dev, s, is 1.231 you wish to do a test if the population mean is less than...
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Length of the column where buckling is likely to occur pongo38 The question seems to be a tube. IN that case there are at least two modes of buckling. First, there is the overall buckling of the member as if it were a long thin rod and Euler's formula might be said to apply. But this could be preceded by a local buc...
4
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Birthdays in the Same Month 1. The problem statement, all variables and given/known data How many people have to be in a room in order that the probability that at least two of them celebrate their birthday in the same month is at least 1/2? Assume that all possible monthly outcomes are equally likely. 2. Relevant eq...
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Method and apparatus for fine resolution brushless motor control - Patent # 6744230 - PatentGenius Method and apparatus for fine resolution brushless motor control 6744230 Method and apparatus for fine resolution brushless motor control Patent...
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More p.m.f [p.d.f.] questions! September 24th 2008, 09:35 AM Chris L T521 More p.m.f [p.d.f.] questions! I think I have the hang of this now, but I have a minor question: I am to find the constant $c$ which would make $f(x)$ satisfy all the conditions of being a p.m.f. $f(x)=c(1/4)^x;~~~x=1,2,3,...$ ...
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Tap A can fill a tank in 36 minutes, Tap B can fill the same Author Message TAGS: Tap A can fill a tank in 36 minutes, Tap B can fill the same [#permalink] 27 Sep 2012, 09:21 ...
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Patent US6553293 - Rear steering control for vehicles with front and rear steering TECHNICAL FIELD OF THE INVENTION The present invention relates generally to vehicular rear-wheel steering control. More particularly, the invention relates to enhanced transient response for vehicles with active rear steering. BACKGROU...
4
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Double Angle help? (: January 27th 2010, 05:40 AM TeriyakiDonnQ Double Angle help? (: Hiii~ I don't understand the double angle identity~ Can anyone explain to me? :3 So i'm given cos81sin81 and i don't know what to do with it. I have the answers and it says it's 1/2sin162. I don't unders...
4
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Unstable ODE muzialis Hello there, I am solving numerically the ODE $$ \dot{y} = min \, (y, A) + B\, sin(t)$$ , A,B being constant. I obtain a very "wiggled" solution which is very fine to me actually, as it echoes the problem I am studying. However, as the numerical solution scheme is quite "rudimentary" I am wo...
5
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Maths question that needs to explained to 10 year old December 29th 2008, 08:58 AM #1 Newbie Joined Dec 2008 Posts 21 Maths question that needs to explained to 10 year old This is question which has to be explaine to a 10 year old. 6 lollies and 3 ice creams cost 8.52 3 icecreams and 6 drinks co...
4
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showing convergence of a function recursion relation up vote 1 down vote favorite I have obtained (formally) a perturbative solution $$ H(y) = \sum_{n=0}^\infty \delta^n H_n(y) $$ to the following integro-differential equation ($\delta$ is a small constant, $\nu$ is a L\'evy measure and $F$ is a function of $y$) $$ 0 ...
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Limit of a sequence of sets: hypercubes. Ok, so I would like to formally settle this one. I have a sequence of sets [itex]C_{N}^{n}\subset\mathbb{R} ^{n}, N\in\mathbb{Z} ^{+}[/itex] defined as follows [tex]C_{N}^{n}:=\left\{ \left( x_{1}, ..., x_{n}\right) \in\mathbb{R} ^{n}: \sum_{j=1}^{n} x_{j}^{2N} \leq n \right\} ...
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Problems with some integration July 21st 2006, 10:54 PM #1 Senior Member Joined Jul 2006 Posts 364 Problems with some integration Hi, im new here, I have some problems with the following integrations: I've tried various things with all of them, but cant figure them out. I'd love some pointers, hopefu...
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Falling towards Forgetfulness: Synaptic Decay Prevents Spontaneous Recovery of Memory Abstract Long after a new language has been learned and forgotten, relearning a few words seems to trigger the recall of other words. This “free-lunch learning” (FLL) effect has been demonstrated both in humans and in neural network ...
4
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Word prob. October 12th 2007, 01:41 PM kwivo Word prob. A particle in a magnetic field travels in a straight line. The force (in Newtons) acting upon it is given by the function F(s) = square root of (s) −s^2, where s = f(t), the position of the particle in meters, changes with time t. At what rate is the fo...
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Integration by separation of variables May 23rd 2009, 04:32 PM #1 Member Joined May 2008 From Melbourne Australia Posts 203 Thanks 15 Integration by separation of variables $\rho \frac {du}{d \rho}=1-e^u$ Use separation of variables to obtain: $e^u=\frac 1 {1-\frac{c_2} \rho}$ When...
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Pulley Torque calculations You're not thinking you can amplify power with a pulley, are you...? No, I understand that power is constant through the belted drive, the torque and speed change to keep this constant. Bandit127, you hit on my though exactly with your example The resultant force will not - it will vary in...
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Physics Forums - Matrices in Matlab sara_87 Jan29-07 04:27 AM Matrices in Matlab Question 1: Solve the system of equations -w + 3x - 2y + z = 1 w + 2x - 4y - 3z = 2 x + 2y + z = 4 2w + 3x - y - z = 7 The attempt at a solution To do this in matlab, this is what I will did: >> A=[-1,3,-2,1;1,2,-4,-3;0,1,2,1;2,3...
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Please solve these April 4th 2008, 07:58 PM #1 Newbie Joined Apr 2008 Posts 1 Please solve these Q1. By how many % will the s.a of the cube increase if each side is doubled? Q2. A circle of radius 7cm is divided into two sectors by cutting 120 degree sector from the centre.The 2 sectors are used to ...
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Probabilty ans statistics July 4th 2006, 12:25 AM #1 Junior Member Joined Mar 2006 Posts 46 Probabilty ans statistics A random variable with normal distribution with unknown mean u and variance 2.25. with a suitable value of u. find the greatest value of P(10.9<X<12.1) guess A random variable w...
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MathGroup Archive: October 2002 [00143] [Date Index] [Thread Index] [Author Index] Re: Re: Accuracy and Precision • To: mathgroup at smc.vnet.net • Subject: [mg37022] Re: [mg36983] Re: Accuracy and Precision • From: Daniel Lichtblau <...
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Family of curves on a surface (Differential geometry) May 11th 2008, 04:09 PM Tchakra Family of curves on a surface (Differential geometry) Here is a question i am not sure how to tackle, I am not familiar with how to deal with family of curves and don't really have much time to look around for the definition as...
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Rms current in circuit with capacitor resistor and rms output 1. The problem statement, all variables and given/known data A 39.5 uF capacitor is connected to a 47.0 ohm resistor and a generator whose rms output is 25.2 V at 60.0 Hz. Calculate the rms current in the circuit. (also asks for voltage drop across resistor...
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Geodesic of a Sphere in spherical polar coordinates (Taylor's Classical Mechanics) 1. The problem statement, all variables and given/known data "The shortest path between two point on a curved surface, such as the surface of a sphere is called a geodesic. To find a geodesic, one has to first set up an integral that g...
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2 Ball Bearings in a Tapering pipe August 23rd 2011, 05:57 AM Dcoz 2 Ball Bearings in a Tapering pipe Hi, I'm new here and after any help that can be given. I've finally decided to throw in the towel on a few questions and ask for help on them. This question is from a revision sheet handed out in class....
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Motion - Please, any help??? April 24th 2010, 06:46 AM Sunyata Motion - Please, any help??? A large stone is falling through a layer of mud and its depth x m below ground level at time t minutes is given by x = 12 - 12e^(-0.5t). How long will it take the stone to reach within 1 mm of its final position? Apr...
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Extended Euclid's algorithm - multiplicative inverse November 11th 2010, 09:40 PM #1 Junior Member Joined May 2010 Posts 26 Extended Euclid's algorithm - multiplicative inverse Hi All, Having trouble with using Extended Euclid's algorithm to find multiplicative inverses. I dont understand the al...
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