content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Analysis of Equation of State for Carbon Nanotubes
Journal of Nanotechnology
Volume 2013 (2013), Article ID 639068, 5 pages
http://dx.doi.org/10.1155/2013/639068
Research Article
Analysis of Equation of State for Carbon Nanotubes
^1Department of Physics, National Institute of Technology Uttarakhand, Srinagar 247174,... | 4 | [
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eigenvalues and eigenvectors theory
September 21st 2012, 06:50 AM #1
Junior Member
Joined
Sep 2012
From
ohio
Posts
68
eigenvalues and eigenvectors theory
Thanks to all in advance for looking at this problem.
Given A is an unspecified 3 x 3 matrix that has eigenvlaues 2, -2, square root of 3 and t... | 5 | [
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Maximizing a volume
July 8th 2009, 01:01 PM #1
Maximizing a volume
I find the following problem very hard!
A rectangular box has 3 faces in the planes given by $x=0$, $z=0$ and $y=0$. The vertex that is not in the latter planes is in the plane $4x+3y+z=36$. Determine the dimensions that maximizes the
volu... | 5 | [
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geometric sequence
June 20th 2007, 08:43 AM #1
Find a, r, and Tn for each geometric sequence
a)t4=24 and t6=96 b)t2=-6 and t5=-162
-thank you for whoever answers my question
a) $t_4 =24$ and $t_6 = 96$
In general
$t_n = t_1 \cdot r^{n - 1}$
We have
$t_4 = t_1 \cdot r^3 = 24$
$t_6... | 4 | [
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Continuous Semimartingales
A stochastic process is a semimartingale if and only if it can be decomposed as the sum of a local martingale and an FV process. This is stated by the Bichteler-Dellacherie theorem or, alternatively,
is often taken as the definition of a semimartingale. For continuous semimartingales, which ... | 4 | [
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Chaos Control and Synchronization in Fractional-Order Lorenz-Like System
International Journal of Differential Equations
Volume 2012 (2012), Article ID 623234, 16 pages
http://dx.doi.org/10.1155/2012/623234
Research Article
Chaos Control and Synchronization in Fractional-Order Lorenz-Like System
Department of Mathem... | 5 | [
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... | 22,505 | 22505 | |
The addition-subtraction puzzle (calculus)
January 12th 2011, 11:02 AM
wonderboy1953
The addition-subtraction puzzle (calculus)
In my easy calculus puzzle, I've submitted $\dfrac{1}{\sin(x)cos(x)}$ (in another form) and I pointed out how by letting 1 = $sin^2x + cos^2x$ would lead to a solution. The formula can ... | 5 | [
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Gabriel Kron, Electric Circuit Model of the Schrödinger Equation, 1945 -
Component of : Early Ideas in the History of Quantum Chemistry.
{This website: Please note: The following article is complete; it has been put into ASCII due to a) space requirement reduction and b) for having... | 4 | [
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Electric ceiling fan
teenholiday
1. The problem statement, all variables and given/known data
An electric ceiling fan is rotating about a fixed axis with an initial angular velocity of 0.290 rev/s. The angular acceleration is 0.888 rev/s^2. Its blades form a circle of diameter 0.740 m.
Through how many revolutions ... | 4 | [
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Translation operator
P: 192 [tex]e^{\alpha\frac{d}{dx}}=1+\alpha\frac{d}{dx}+\frac{\alpha^2}{2!}\frac{d^ 2}{dx^2}+...=\sum^{\infty}_{n=0}\frac{\alpha^n}{n!}\frac{d^n}{dx^n}[/tex]
Why this is translational operator?
##e^{\alpha\frac{d}{dx}}f(x)=f(x+\alpha)##
H... | 5 | [
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Application
The period of oscillation T of a simple pendulum for small amplitude is given by:
where g is the standard acceleration of gravity and L is the length of the string of the pendulum (or, more precisely, the distance from the point of suspension to the center of the pendulum bob).
A student constructs a pen... | 4 | [
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(n choose k) How can I work this out?
I know what n choose k means but usually I get given both the values.
I don't get it... what value is N? But how do I compute that using my calculator? N still does not have a value, you're saying 8x7x6x5 = (N - 4) but what is N?
1. Definbition: $\displaystyle{{n \choose k} = \fr... | 4 | [
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Proof within Univariate Normal
Show that E(X)=μ<br><br>thats all the information i've been given.<br>I dont know where to start.<br>
First, note that the pdf of $\mathcal{N}\left(\mu,\sigma^2\right)$ is $f\!\left(x\right)=\frac{1}{\sqrt{2\pi}\sigma}e^{-\frac{1}{2}\left(\frac{x-\mu}{\sigma}\right)^2}$ Now, $E\left(x\ri... | 5 | [
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rate of change and extrema
January 2nd 2012, 12:20 PM #1
Junior Member
Joined
Dec 2010
Posts
47
Hi, I have a strangely worded problem that I'm having problems interpreting/solving
(calculator active) The rate of change R, in km/hr, of the altitude of a hot air balloon is given by $R(t) = t^3 - 4t^2 +... | 4 | [
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Long Run Damage Calculation, Math is Fun! - Tyrian Assembly
Hi all,
Don't know if this has been posted before but I was wanting to figure out how to maximize my raw power stats (before weapon damage, traits, skills and boons/conditions are added which can be further
tweaked and tested in Heart of the Mists with gear a... | 4 | [
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Math Help
June 12th 2011, 09:29 PM #1
spheres
Three mutually tangent spheres of radius 1 rest on a horizontal plane. A sphere of radius 2 rests on them. What is the distance from the plane to the top of the larger sphere?
The answer is 3+ root 69/3.
I really can't think of an approach, yet...
The l... | 4 | [
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Patent US7778805 - Regression system and methods for optical proximity correction modeling
Publication number US7778805 B2
Publication type Grant
Application number US 11/191,849
Publication date Aug 17, 2010
Filing date Jul 28, 2005
Priority date Jul 28, 2005
Fee status Paid
Also published as ... | 4 | [
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... | 22,516 | 22516 | |
given that vector v1=2i-3j & v2=i+5j find:
a) the magnitude of the vector v1+(2xv2) b) the unit vector in the direction of (2xv1)-v2
To a): $\overrightarrow{v_1} = \langle 2,-3 \rangle$ $\overrightarrow{v_2} = \langle 1,5 \rangle$ then $\overrightarrow{v_1} + 2 \cdot \overrightarrow{v_2} = \langle 2,-3 \rangle + 2 \cd... | 4 | [
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Integration Problem (Substitution)
Are we integrating with respect to x or t? I suspect you mean for the two variables to be the same, and if so, let u be the value under the radical, and you will find you can easily get du as part of
the integral.
Yes, I meant them to be the same, oops! I got the answer to be sqrt((t... | 5 | [
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Acid/Salt math
March 11th 2008, 03:19 AM #1
Junior Member
Joined
Mar 2008
Posts
51
Acid/Salt math
a) how high is the salt in a solution of 800g water, 50g alt and 500g 2,5 saltsolution?
b) A detergent that is bought 20% strong and is going to be thinned to the proportion 3:50. What strenght does the... | 4 | [
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Applying chain rule
October 10th 2009, 09:36 PM #1
Applying chain rule
Find the derivative of the following:
$y = (2x - 5)(4 - x)^{-1}$
I got $y' = 2x(4 - x)^{-1} + (2x - 5)(4 - x)^{-2}$ or $y' = \frac{2x}{4 - x} + \frac{2x - 5}{(4 - x)^2}$
Correct?
$y' = 2x(4 - x)^{-1} + (2x - 5)(4 - x)^{-2}$... | 4 | [
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Area and Circumference, homework for 2moro!
September 16th 2007, 05:37 AM #1
Newbie
Joined
Oct 2006
Posts
12
Area and Circumference, homework for 2moro!
Hello, please can you help me solve these math problems i am having some trouble.
Q1. a circle has an area of 98mm(squared).
Calculate the circu... | 4 | [
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0.0062866210937... | 22,521 | 22521 | |
Connection of linear equation to span.
(note: I switched a,b,c, to [tex]b_1,b_2,b_3[/tex].)
E is defined by two things, [tex]E=\{(x, y, z) | b_1x + b_2y + b_3z = 0\}[/tex], as well as, [tex]E=(a_2, a_1 + a_2, a_2-2a_1)[/tex], so inserting the values of the linear combination into the
constraint of E we have:
[tex]b_1... | 4 | [
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... | 22,522 | 22522 | |
Closest approach of particle problem - Please help
1. The problem statement, all variables and given/known data
A proton (q = 1e, m = 1u) and an alpha particle (q = +2e, m = 4u) are fired directly toward each other from far away, each with a speed of 0.01c. What is their distance of closest approach, as
measured betwe... | 5 | [
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Cumulative Distribution Function Question
October 1st 2006, 06:48 AM
abc4616
Cumulative Distribution Function Question
The C.D.F. (cumulative density function) of the random variable X is given by,
F(x)= [0, x<0
x/2, 0<=x<1
2/3, 1<=x<2
11/12, 2<=x<3
1, 3<=x]
a) Find P(X>1/2)
b) Fin... | 4 | [
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Why do you Tack on The Negative For this Integral
Because using u-substitution, we get this:
u = 1 - y, du = - dy
And so...
[tex]\int \frac{1}{1-y} dy = - \int \frac{1}{u} du[/tex]
Integrating the right-hand side, we get - ln|u| + C, or - ln|1-y| + C.
| 5 | [
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Algebra showing 2 = 1. Where's the error?
June 3rd 2010, 09:02 PM
chinchu
Algebra showing 2 = 1. Where's the error?
Can anyone explain how this is possible?
1. Let a and b be equal non-zero quantities
a = b
2. Multiply through by a (^ : is raised to)
a^2 = ab
3. Subtract b^2
a... | 4 | [
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Second derivative help!!
March 2nd 2009, 05:55 PM #1
Newbie
Joined
Mar 2009
Posts
19
Second derivative help!!
Hi there, I've been working this problem forever and I cannot come close to the right answer...
A function of the position of a car being driven on a straight road, measured in feet from som... | 5 | [
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Con
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ ┃
... | 5 | [
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elliptic curves: points of finite order
October 25th 2009, 11:24 PM #1
Newbie
Joined
Oct 2009
Posts
11
I was wondering if anyone could explain the method of finding all the points of finite order over C(\mathbb{Q}), with C: y^2=x^3 + px, where p is a prime bigger or equal to 2.
this would explain a l... | 5 | [
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Finding expected value and variance of pdf
Find $E(X)$ and $Var(X)$ for the random variable $X$ with probability density function proportional to: $e^{-x^2+x}$
Last edited by CaptainBlack; June 19th 2010 at 12:02 AM.
First, and very much most importantly, you must specify a DOMAIN. I'm going to guess you mean $[-\inf... | 5 | [
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Improved Method of Blind Speech Separation with Low Computational Complexity
Advances in Acoustics and Vibration
Volume 2011 (2011), Article ID 765429, 10 pages
http://dx.doi.org/10.1155/2011/765429
Research Article
Improved Method of Blind Speech Separation with Low Computational Complexity
^1Corporate Research & D... | 4 | [
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Control Systems and Number Theory
International Journal of Mathematics and Mathematical Sciences
Volumeย 2012ย (2012), Article IDย 508721, 28 pages
http://dx.doi.org/10.1155/2012/508721
Research Article
Control Systems and Number Theory
Sanmenxia SuDa Communication Group, Sun Road, Sanmenxia Economical Development Z... | 4 | [
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trigonometry and rows
January 21st 2006, 07:23 AM
mahadeva
trigonometry and rows
I need to prove that:
sin x + sin 2x+ ...........sin nx = (sin nx/2 * sin (n+1)x/2) / sinx/2
it is specified that sin x/2 is not 0 ,and that n is >=1
I used various trigonometry theoremes but i just cant find the algo... | 5 | [
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How do matrices work
okkvlt
Say i want to find [xa,ya,za]*[xb,yb,zb]
I could use pythagoras to find |a| and |b|. Then use pythagoras again to find the distance between the endpoints of a and b. Then use law of cosines to find the angle formed by a and b, then do |a||b
|cos(angle).
Or, i could just do xa*xb+ya*yb+za... | 4 | [
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Parametric Lines & Planes
July 16th 2010, 04:58 AM #1
Junior Member
Joined
Jan 2010
Posts
43
Parametric Lines & Planes
Hi I'm reading Lang's Intro to Linear Algebra Page's 30 -36 and I'd just like some input on whether I understand this or not. Basically my problem is with Planes but the parametric eq. t... | 4 | [
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Math Help
August 1st 2008, 12:43 AM #1
Junior Member
Joined
Apr 2008
Posts
37
Variance
A dealer's profit in units of $5,000 on a new automobile is a random variable X having density function
f(x,y) = 2(1-x) for -1 <= x <= 1
a) Find the vaiance in the dealer's profit.
b) Demonstrate that che... | 5 | [
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After calculus first pure math course, having a hard time.
chimath35
Also if you are bored, here is a number theory problem:
An integer is divisible by 9 if and only if the sum of its digits is divisible by 9
Proof by induction?
I am stuck ac=b 9c=b ex. 9c=81 so c is an int. thus divisible let b= d+dn so 9c=d+dn ... | 5 | [
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Periodic Solutions for Impulsive Stochastic BAM Neural Networks with Time-Varying Delays in Leakage Terms
International Journal of Differential Equations
Volume 2013 (2013), Article ID 543947, 12 pages
http://dx.doi.org/10.1155/2013/543947
Research Article
Periodic Solutions for Impulsive Stochastic BAM Neural Networ... | 5 | [
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... | 22,538 | 22538 | |
Question about Solid of Revolution (Disc Method)
March 2nd 2011, 06:49 AM #1
Newbie
Joined
Mar 2011
Posts
1
Question about Solid of Revolution (Disc Method)
So, I know the formula for the disc method is: $v=pi\int\limits_{b}^{a}[R(x)]^2dx$ ...what I'm so confused about is how to fix up $[R(x)]$ when the ... | 5 | [
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Sphere, Geometry Problem
September 21st 2013, 05:37 AM
PhillipMasagca
Sphere, Geometry Problem
A cone circumscribes a sphere and has its slant height equal to the diameter of its base.
Show that the volume of the cone is 9/4 the volume of the sphere.
Basically I need to show my professor that the volume... | 4 | [
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Mistakes about illuminance
Hello everybody,
this question is about an exercise but I post it here because it is not homework, it is an exercise that I've done to learn by myself. I hope it is ok.
It is an exercise from Irodov book (exercise 5.12)
The exercise says:
A small spherical lamp, uniformly luminous with radius... | 4 | [
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Basic Pharmacokinetics and Toxicokinetics
Crispin H. Pierce, Ph.D.
(206) ... | 4 | [
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Finding final 'X Velocity'
June 12th 2012, 11:37 AM
CakeSpear
Finding final 'X Velocity'
Hi
I have never been very good with advanced math, and i dont even know if this is the correct area to ask this kind of question.
But anyway here goes:
...
I have a Ball and i want to determine its final X V... | 4 | [
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Help with a proof
February 20th 2011, 12:06 AM #1
Junior Member
Joined
Feb 2011
Posts
43
Thanks
5
Ok I've just started a university maths course and the first thing we are learning is proofs. (I hope this is the right sub-forum
I get the concept and all but I am reading a book on the subject anywa... | 4 | [
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0.01550292968... | 22,544 | 22544 | |
Race word problem
September 30th 2008, 11:31 AM #1
Newbie
Joined
Sep 2008
Posts
19
Race word problem
At a recent world cup 10000m speed skating race, the winner, A, finished in 13 minutes 20.4 seconds. The last place finisher, B, took 15 minutes 37.0 seconds. The track is 400 m long.
i. How many mete... | 4 | [
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Electric Potential Vs. Electric Field
Hello pwkellysr,
Welcome to Physics Forums!
Yes, I think you are correct (if I'm understanding you correctly).
Remember, potential is related to the definite integral of the electric field.
[tex] V(B) - V(A) = -\int _A ^B \vec E \cdot d \vec l [/tex]
I have a helpful hint. Aft... | 4 | [
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More Bayes’ magic
Statistics can be quite bewildering. Consider the following problem:
It is given that if a person having a disease takes a diagnostic test for the disease, the test returns a positive result 99% of the time, or with a probability of 0.99. Now, for some person
picked at random, if the test ret... | 5 | [
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Exact and Approximate Stochastic Simulation of Intracellular Calcium Dynamics
Journal of Biomedicine and Biotechnology
Volume 2011 (2011), Article ID 572492, 5 pages
http://dx.doi.org/10.1155/2011/572492
Review Article
Exact and Approximate Stochastic Simulation of Intracellular Calcium Dynamics
Medical Biophysics G... | 4 | [
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Patent US5801974 - Calculation method and circuit for obtaining a logarithmic approximation value
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improved calculation method and circuit for obtaining a logarithmic approximation value. More particularly, the invention relates ... | 5 | [
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Can anyone give a common-sense explanation of singular values?
MikeyW
I think I'm understanding it slightly. My problem is mostly concerned with numerical solutions to under-determined problems, and I think I do have the issue that if A is rank-deficient, then rounding
errors would appear to make A'*A "singular to w... | 5 | [
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Physics Forums - View Single Post - Tangent bundle on the sphere
Sephi
Hi everybody,
How can one show that the tangent bundle TSē of the 2-sphere is not trivial ? I know we can use the tools of algebraic topology, but I'm looking for a way to show it only with elementary tools of
differential geometry.
More preci... | 4 | [
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Physics Forums - Need in solving a programm in FOTRAN
Sampath Emani Feb11-12 01:04 PM
Need in solving a programm in FOTRAN
Friends,
i have written a program in FOTRAN for solving a equation [f(x0,y0)= 2*(y**2)+5]
I'm in the learning stage of FOTRAN. So please don't mind if my program has got any silly mistakes.
Pl... | 4 | [
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0.026000976... | 22,552 | 22552 | |
Combinations
August 30th 2006, 05:20 PM
ashkash
Please Help
Here is the problem:
A sequence of letters of the form abcba is an example of a palindrome of five letters.
a. If a letter may appear more than twice, how many palindromes of five letters are there? of six letters?
b. Repeat part a under ... | 4 | [
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Characteristic Function
August 19th 2007, 08:30 AM #1
Member
Joined
Aug 2007
Posts
239
Characteristic Function
Given $A \in \mathcal{P}(X)$ define the characteristic function $\chi_{A}: X \to \{0,1\}$ by $\chi_{A}(x) = \begin{cases} 0&\text{if}\ x ot \in A\\ 1&\text{if}\ x \in A \end{cases}$.
(i) Pr... | 5 | [
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-0.06787109375,... | 22,554 | 22554 | |
Proving a subgroup relation
October 18th 2009, 01:51 PM #1
Junior Member
Joined
Oct 2009
Posts
66
Heres the question:
Let G be a group a element in G and H is a subgroup of G. Define K={aha(inverse) such that h element in H. Prove K is a subgroup of G.
Heres what i got.
Let x,y elements in K ... | 5 | [
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AWG, kcmil to Metric mm2
Details
Category: Electronics Software
Published on Monday, 10 September 2012 04:28
Written by Super User
Hits: 1212
AWG, kcmil to Metric mm2
Background
Imagine you were an 19th century engineer and were given the task to sort up among the different sizes wires your e... | 4 | [
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Confidence Interval
December 25th 2008, 04:35 AM #1
MHF Contributor
Joined
Jul 2008
From
NYC
Posts
1,489
Confidence Interval
A math expert kept track of how many questions he answered over one week: 10, 20, 30, 20, 20, 70, 40 What is the 95% confidence interval for the mean number of questions answer... | 5 | [
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Nonequilibrium Thermodynamics and Distributions Time to Achieve a Given Level of a Stochastic Process for Energy of System
Journal of Thermodynamics
Volume 2012 (2012), Article ID 318032, 5 pages
http://dx.doi.org/10.1155/2012/318032
Research Article
Nonequilibrium Thermodynamics and Distributions Time to Achieve a G... | 4 | [
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Patent US3560925 - Detection and correction of errors in binary code words
Feb. 2, 1971 HTOHNSORGE 3,560,925
' DETECTION AND CORRECTION OF ERRORS IN BINARY CODE WORDS Filed Ma rch 25, 1968 4 Sheets-Sheet 1 Fig] SHIFT /REGISTER ERROR CODE CONTROL FR Z INPUT 4 1L L L J T L S'Ii SHIFT REGISTER b I KOUTPUT E l
1 A F ,TEMP... | 4 | [
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How to change to f(y,t)?
April 16th 2010, 03:30 AM #1
Newbie
Joined
Apr 2010
Posts
4
How to change to f(y,t)?
How do you change the form of a differential equation from dy/dt to f(y,t)? If I have dy/dx = y/A(y) + 1 where A(y) is the area of a cross section of a conical base. How can I change A(y) to t?
... | 4 | [
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Use Cramer's Rule to find x_2 when Ax=...
April 12th 2010, 05:11 PM #1
Member
Joined
Jan 2010
Posts
232
Use Cramer's Rule to find x_2 when Ax=...
I think I was handed a trick question.
For the matrix $\left(\begin{array}{ccc}1 & 2 & 3 \\2 & 1 & 3 \\1 & -1 & -1\end{array}\right)$, use Cramer's Rule t... | 5 | [
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Two digit number divided by sum of digits etc.
March 2nd 2011, 06:57 AM #1
Newbie
Joined
Feb 2011
Posts
7
Two digit number divided by sum of digits etc.
If a 2 digit number is divided by the sum of its digits the result is 6 with a remainder of 6.If the same number has its digits swapped ( if it was 23, ... | 4 | [
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Various stuff, mostly about sets
I want to prove some various but closely-related things about a language, so if I need help later on, I'll just add it here. Definitions are in indigo.
The primitive symbols of formal language L fall into two disjoint sets: a countably infinite set of propositional symbols and a non-emp... | 4 | [
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Need help getting started!
Ok i used the triangle inequality to show that the function itself is differentiable; my work looks like
assume (h1, h2, ...... , hm) is differentiable
therefore by the triangle inequality,
= ||(h1 .... hm)(x) - (h1.....hm)(Xo) - D(h1.....hm)(Xo)(x-Xo)||/ ||x-Xo||
and since h= (h1,h2, ....., ... | 4 | [
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Optimal Model of Operation Parameters of Gathering Pipeline Network with Triple-Line Process
Advances in Mechanical Engineering
Volume 2013 (2013), Article ID 573542, 7 pages
http://dx.doi.org/10.1155/2013/573542
Research Article
Optimal Model of Operation Parameters of Gathering Pipeline Network with Triple-Line Pro... | 4 | [
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Vectors, lines, and planes
May 20th 2008, 07:37 AM
pantera
Vectors, lines, and planes
Help please!
The points A, B, C have position vectors i + j + 2k, i + 2j + 3k, 3i + k respectively and lie in plane π.
1. Find the area of triangle ABC
2. the shortest distance from C to the line AB
3. the carte... | 5 | [
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Why does E=mc^2
ZeroPivot
i do know upto multivariable.
OK, try this. It's a draft of an FAQ that I've been working on.
In both non-relativistic and relativistic physics, we can define an object's (kinetic) energy in terms of the work done on the object by a force, using the work-energy theorem. In the
non-relativ... | 4 | [
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Change the Subject of a Formula | Subject of the Formula | Worked-out Examples
Change the Subject of a Formula
In mathematics we will learn how to change the subject of a formula and find the value of the variable.
Change the Subject of a Formula
Subject of the formula:
It is a variable which is expressed in te... | 4 | [
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Prove or disprove, if H,K<G => HuK<G
October 11th 2011, 05:06 PM #1
Member
Joined
Dec 2010
Posts
92
Prove or disprove, if H,K<G => HuK<G
Problem: Prove or provide a counter example.
If H and K are subgroups of a group G, then $H \cup K$ is a subgroup of G.
****************
I had the set of ... | 5 | [
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Calculate : f'(0)
f is the function : $<br /> f(x+y)=f(x)+f(y)+xy^{2}+x^{2}y<br />$ and : ${f}'(0)=1$ Calculate : ${f}'(4)$
According to ... Derivative -- from Wolfram MathWorld ... the 'more symmetrical' notation of the derivative is... $f^{'} (x) = \lim_{h \rightarrow 0} \frac{f(x+h)-f(x-h)}{2h}$ ... in any case
con... | 4 | [
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Math Help
October 21st 2009, 10:22 PM #1
Newbie
Joined
Feb 2009
Posts
2
Proving
I like proving but this one, I got stuck because of time pressure. It was the last question and I was hurrying since I only got 5 mins left. I didn't get to finish my solution so I may have
gotten a few points off it.
... | 4 | [
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Slope’s Effect on Accurate Weighing
Customers often have concerns that their floor isn’t level and questions as to what affect that will have on their weight readings. The scale is designed with the assumption that the load will be
parallel to the direction of gravity and perpendicular to the weighing platform; meanin... | 4 | [
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Rate of change
April 14th 2006, 07:11 AM
dadon
Rate of change
How do you do the following rate of change questions
when t = 1.2 for all the following questions:
1) y = 4/t + 4lnt
2) x = sin(t^2 +1) , y = cos(2t -3)
3) x = 1 / 1+2t , y = t / 1+t
4) q = 2e^-t/2.cos2t
5) x = e^2t.t^3(2... | 5 | [
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Solving Diophantine Equations
Diophantine Equations are those in which there are more
variables than equations and hence multiple solutions.
Usually, integer solutions are required.
This page finds integer solutions to single linear
Diophantine Equations of the form
• A x + B y = C
where A, B, and C are given.
Si... | 4 | [
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... | 22,574 | 22574 | |
Height of minimal model of ZFC
up vote 7 down vote favorite
What do we know about the height of the minimal (transitive) model of ZFC, that is, about the least α such that L[α] is a model of ZFC? Call this ordinal μ. It is countable, since otherwise we could
build L inside the collapse of a countable elementary submod... | 4 | [
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U substitution indefinite integral
October 6th 2012, 05:21 AM #1
Newbie
Joined
Oct 2012
From
Georgia
Posts
1
U substitution indefinite integral
I have been trying to solve the indefinite integral (x-3)*sqrt(x-1) dx. I have tried u substitution by using u=(x-1)^1/2 or using u=x-3. There has to be a tr... | 5 | [
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Surveys and Probability Distribution
October 15th 2012, 06:21 AM #1
Newbie
Joined
Oct 2012
From
Egypt
Posts
1
This is a very difficult question that I have been working on for 2 hours now.. Can any one help?
In a survey, some of the questions concern sensitive issues (e.g., income, drug use, sex... | 5 | [
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Some Further Results on Traveling Wave Solutions for the ZK-BBM(
Journal of Applied Mathematics
Volume 2013 (2013), Article ID 156139, 14 pages
http://dx.doi.org/10.1155/2013/156139
Research Article
Some Further Results on Traveling Wave Solutions for the ZK-BBM() Equations
^1College of Mathematics and Information S... | 5 | [
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... | 22,578 | 22578 | |
infinite exponentials
May 1st 2009, 03:39 AM #1
Newbie
Joined
May 2009
Posts
2
Hi all,
A friend asked me if i could sove Ln(x)=-x in exact form.
The solution i gave was x=e^(-e)^(-e)^(-e)^...
Ln(x)=Ln[e^(-e)^(-e)^...]=(-e)^(-e)^(-e)^...=-x
Whilst exploring this answer i have had difficult... | 5 | [
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Area of Triangle enclosed between arcs
October 5th 2009, 01:25 PM #1
Junior Member
Joined
Sep 2009
Posts
32
Area of Triangle enclosed between arcs
The triangle DEF, an isosceles right triangle, EF=DF=2.
Circular arcs of radius 2 centered at F and D meet the hypotenuse at G and H, respectively. Find t... | 4 | [
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Please help transistor amplifier
Jony130
I don't understand the question?
you show me first this example
-----
---
OK
Av = Rc/re = gm*Rc = Ic/26mV*Rc = (Ic*Rc)/26mV
50[V/V] = (Ic*Rc)/26mV
from this
(Ic*Rc) = 1.3
I choose Rc = 1K
So
Ic = 1.3/1K = 1.3mA
But as you can see this approach is not very good bec... | 5 | [
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Probability of selecting the first urn.
August 8th 2006, 08:23 AM
kwtolley
Probability of selecting the first urn.
Ok here it goes,
One urn contains 3 red and 7 white marbles. A second urn contains 2 red and 8 white marbles. One urn is selected and a ball drawn. The probability of selecting the first urn is ... | 5 | [
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0.06689453125,
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Patent US20050066174 - Blinded encryption and decryption
CROSS REFERENCE TO RELATED APPLICATIONS
Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
BACKGROUND OF THE INVENTION
The present invention pertains to secure communications in computer networks and more particular... | 4 | [
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Patent US7362823 - Maximum ratio transmission
Publication number US7362823 B2
Publication type Grant
Application number US 11/766,853
Publication date Apr 22, 2008
Filing date Jun 22, 2007
Priority date Sep 17, 1998
Fee status Paid
Also published as US6459740, US6826236, US7274752, US7609771, U... | 4 | [
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Lipschitz continuous
November 13th 2007, 02:24 AM
dopi
Lipschitz continuous
Let f : R ->R be a function.
We say that f is Lipschitz continuous if there is some
L > 0 such that |f(x) − f(y)| < L|x − y| for all x, y in R.
I want to show that f : R ->R defined as f(x) = x^2 / (1+ x^2)is Lipschitz cont... | 5 | [
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minimum distance
April 21st 2009, 05:26 AM
RanDom
minimum distance
Let (X,d) be a metric space and let A be a compact subset of X. Let x be a point in X.
I want to show that there exists a point a* in A such that d(x,a*) is less than or equal to d(x,a) for all a in A.
----------------------------------... | 5 | [
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find value in ODE
March 29th 2006, 12:48 PM #1
Member
Joined
Nov 2005
Posts
111
find value in ODE
Hi , Please Can I have some help with this problem:
Find the values of D such that the solution of the equation is bounded:
y''-4y'= sin(x); y(0)=D, y'(0)=0.
I started by applying the laplace ... | 5 | [
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0.046875,
-0... | 22,587 | 22587 | |
User:Michiexile/MATH198/Lecture 10
From HaskellWiki
< User:Michiexile | MATH198
(Difference between revisions)
← Older edit Newer edit →
Line 1: Line 1:
IMPORTANT NOTE: THESE NOTES ARE STILL UNDER
DEVELOPMENT. PLEASE ... | 4 | [
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... | 22,588 | 22588 | |
Completely stumped by a picture frame >_<
October 31st 2009, 12:48 AM #1
Completely stumped by a picture frame >_<
So here is the question:
A picture that measures 10cm by 8cm is to be surrounded by a mat before being framed. The width of the mat is to be the same on all sides of the picture. The area of the... | 4 | [
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Business Homework Problem Help
April 27th 2009, 08:42 PM
hate_gravity
Hey all, new here. This math problem is killing me, and I have to turn it in tomorrow, but I can't figure out the right answer:
The marketing manager of a department store has determined that revenue, in dollars, is related to the number o... | 4 | [
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Series - nth term - Is this right?
October 25th 2008, 08:10 PM #1
Newbie
Joined
Oct 2008
Posts
4
Series - nth term - Is this right?
I am not 100% confident about this so would someone mind checking my work?
The nth partial sum of a Series is given by:
$Sn=\frac{1}{n+1}+\frac{1}{n+2}+\frac{1}{n+3... | 5 | [
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integration using cute root
October 24th 2008, 01:02 AM #1
Super Member
Joined
Oct 2007
From
Santiago
Posts
517
integration using cute root
hey guys, im interested in another integration question using cute roots
integrate:
$<br /> <br /> \int \frac{1}{\sqrt[3]{4-5x}}<br /> <br />$
any... | 5 | [
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... | 22,592 | 22592 | |
An Application of Probability to Epidemiology
Statistics Across the Curriculum Home Page
Glossary
Course Schedule
An Application of Probability to Epidemiology
Bayes rule is used in epidemiology to calculate the probability that an individ... | 5 | [
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... | 22,593 | 22593 | |
tangent through the origin for lnx
April 6th 2008, 02:47 PM #1
Member
Joined
Feb 2008
Posts
97
tangent through the origin for lnx
Find the value of x where the tangent to y=lnx is a line through the origin.
Can someone give me an idea of the steps involved here? The derivative of lnx will tell the s... | 4 | [
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Math Help
Find $\sum_{n=1}^n(\frac{1}{4r^2-8r+3})$ given that $\frac{2}{4r^2-8r+3}=\frac{1}{2r-3}-\frac{1}{2r-1}$ $\sum_{n=1}^n(\frac{1}{4r^2-8r+3})=\frac{1}{2}\sum_{n= 1}^n(\frac{1}{2r-3}-\frac{1}{2r-1})$ $=\
frac{1}{2}\sum_{n=1}^n(\frac{1}{2r-3})-\frac{1}{2}\sum_{n= 1}^n(\frac{1}{2r-1})$ $=\frac{1}{2}[\frac{1}{\frac... | 5 | [
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A General Approximation Scheme for Solutions of Various Problems in Fixed Point Theory
International Journal of Analysis
Volume 2013 (2013), Article ID 762831, 18 pages
http://dx.doi.org/10.1155/2013/762831
Research Article
A General Approximation Scheme for Solutions of Various Problems in Fixed Point Theory
Depart... | 5 | [
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Protons to accelerate a space probe
Okay ppl, I have a question, I'd just like you to check that my working here is correct.
Q: A space probe of mass m=490kg is driven by an ion propulsion motor that involves the use of positive ions, each of mass m=2.18*10^-25 kg and having a charge of magnitude e=1.6*10^-19 C. These... | 4 | [
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characterisitic subgroup implies normal subgroup
April 8th 2010, 10:03 AM
wutang
characterisitic subgroup implies normal subgroup
Recall that a subgroup N of a group G is called characteristic if F(N)=N for all automorphisms F of G. If N is a characteristic subroup of G, show that N is a normal subgroup of G.
... | 4 | [
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Calculate the summations
How far have you been able to work these? And are these 4 questions? -Dan
Hello, WORLD! This is a tough problem for the algebra forum. I'm going to use a little calculus. I hope you will still find my remarks useful. Start with the Binomial Theorem: $(1+x)^n = \sum_{i=0}^n
\binom{n}{i} x^i$ In... | 5 | [
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