content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
derivative of exponential function
February 19th 2009, 11:24 PM #1
Newbie
Joined
Feb 2009
Posts
17
derivative of exponential function
the problem is f(x)=x^(1/x).
the answer is supposed to be something like x^(1/x-2)*(1-ln x)
i attempted to solve it for like 20 mins and have no clue how to do thi... | 5 | [
0.046875,
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0.00102996826171875,
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0.0751953125,
0.033203125,
0.103515625,
-0.0498046875,
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-0.021... | 19,300 | 19300 | |
Patent US6529634 - Contrast sensitive variance based adaptive block size DCT image compression
BACKGROUND OF THE INVENTION
I. Field of the Invention
The present invention relates to image processing. More specifically, the present invention relates to a compression scheme for image signals utilizing adaptively sized ... | 4 | [
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0.0145263671875,
0.135742187... | 19,301 | 19301 | |
Need a method for solving this..
February 10th 2011, 09:14 PM
qleeq
[SOLVED]Need a method for solving this..
$\lim_{x \to 0} \frac{ln(1-x) + sin(x)}{1-cos^2(x)}$
Tried using L'Hopital and I know that's what you have to use but I still get stuck here..
$\lim_{x \to 0} \frac{\frac{1}{x-1}+cos(x)}{sin^2(x... | 5 | [
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0.015... | 19,302 | 19302 | |
Quadratic equation
November 24th 2008, 08:53 PM
iamanoobatmath
Quadratic equation
Quote:
When bicycles are sold for $300 each, a cycle store can sell 70 in a season. For every $25 increase in the price, the number sold drops by 10.
a) Represent the sales revenue as a function of the price.
b)The tot... | 4 | [
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0.00396728515625,
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Why are Bell's inequalities violated?
Nugatory
At the risk of putting words in DrChinese's mouth (but if I get it wrong we'll find outnon-conspiratorial local realistic model". If the choice of angles is deterministic and the source knows what
the determining rule is, or if the source is allowed to influence the cho... | 4 | [
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Optimal Variational Method for Truly Nonlinear Oscillators
Journal of Applied Mathematics
Volume 2013 (2013), Article ID 620267, 6 pages
http://dx.doi.org/10.1155/2013/620267
Research Article
Optimal Variational Method for Truly Nonlinear Oscillators
^1Faculty of Mechanical Engineering, “Politehnica” University of T... | 5 | [
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Use Cauchy's integral theorem for derivatives to evaluate the contour integral.
August 30th 2010, 02:34 PM #1
Newbie
Joined
Aug 2010
Posts
2
Use Cauchy's integral theorem for derivatives to evaluate the contour integral.
a) Use Cauchy's integral theorem for derivatives to evaluate the contour integral
... | 5 | [
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What is the derivation for decrease in g with depth?
Yes the basic idea is this: picture the point where you want to calculate g. Now imagine a sphere with the center of the earth as its center, that has this point on its surface. Gauss' law says that
only the mass contained within this sphere counts toward the gravit... | 5 | [
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Combinatorial Proofs of a binomial identity
Think about it like this: Imagine you have a big set [tex] S [/tex], with [tex] n [/tex] elements. You want to find the number of ordered pairs [tex] (A, B) [/tex], where [tex] A [/tex] and [tex] B
[/tex] are subsets of [tex] S [/tex], [tex] A [/tex] has size [tex] m [/tex], ... | 4 | [
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-0.02307... | 19,308 | 19308 | |
Module Equations.
September 8th 2011, 09:24 AM
ArhimedesMadeMeDoIt
Module Equations.
Greetings,
I'm new to this forum and I require urgent help. I was gone from my country for 2 weeks and meanwhile my class revised the math stuff from previous year. Can anyone help?
|x-3|=-1
|x+4|=2
|x|=2+x
... | 4 | [
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MathGroup Archive: December 2001 [00356]
[Date Index] [Thread Index] [Author Index]
Re Solve for Equations
• To: mathgroup at smc.vnet.net
• Subject: [mg32104] Re Solve for Equations
• From: "Alan Mason" <swt at austin.rr.com>
• Dat... | 5 | [
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... | 19,310 | 19310 | |
Analysis proof
April 28th 2010, 09:13 PM
tharris
Analysis proof
How would I prove there exists a positive real number x such that x^2=2? I need to use the Archimedean property.
April 28th 2010, 09:16 PM
Drexel28
April 28th 2010, 09:57 PM
tharris
Do I start with: suppose x^2 does not equal 2? Or do I begi... | 4 | [
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... | 19,311 | 19311 | |
Existence Results for Singular Boundary Value Problem of Nonlinear Fractional Differential Equation
Abstract and Applied Analysis
VolumeΒ 2011Β (2011), Article IDΒ 605614, 9 pages
http://dx.doi.org/10.1155/2011/605614
Research Article
Existence Results for Singular Boundary Value Problem of Nonlinear Fractional Diffe... | 5 | [
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Solution to Simplification of Algebraic Expression
October 1st 2010, 02:21 PM #1
Junior Member
Joined
Sep 2010
Posts
68
Solution to Simplification of Algebraic Expression
The following expression i am looking to confirm whether my answer is correct:
$\displaystyle \frac {6a+3}{2a^2+5a+2}$
For t... | 4 | [
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Challenges in the Application of Fractional Derivative Models in Capturing Solute Transport in Porous Media: Darcy-Scale Fractional Dispersion and the Influence of Medium Properties
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 878097, 10 pages
http://dx.doi.org/10.1155/2013/878097
Research Artic... | 4 | [
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Iterative Algorithms with Perturbations for Solving the Systems of Generalized Equilibrium Problems and the Fixed Point Problems of Two Quasi-Nonexpansive Mappings
Abstract and Applied Analysis
Volume 2012 (2012), Article ID 161897, 22 pages
http://dx.doi.org/10.1155/2012/161897
Research Article
Iterative Algorithms ... | 5 | [
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complex analysis: integrals
http://i3.photobucket.com/albums/y57...ty/prob3-1.jpg how can i do this, applying Rouche Theorem and Cauchy Argument Principle?
Use Cauchy's Argument Principle. 1) $\frac{1}{2\pi i}\oint_{\Gamma}\frac{f'(z)}{f(z)}dz = \mathbb{Z} - \mathbb{P}$ where $\mathbb{P}$ is the number of poles and $\... | 4 | [
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... | 19,316 | 19316 | |
Direct ways
March 13th 2009, 07:27 AM #1
Member
Joined
Oct 2008
Posts
156
Direct ways
Are there any direct ways of proving that if $f$ is real-valued and Riemann integrable on $[a,b]$, then $f$ is bounded?
Because the usual proof would be by contraposition:
Outline of "Usual Proof"
1. Ther... | 5 | [
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Arc length and volume of the solid.
Question #1: "Find the volume of the solid that results when the region enclosed by y = x^2 -1 x = 2 y = 0 is revolved about the y-axis." Imagine, or draw the figure on paper. The intersection of the
vertical line x=2 and the parabola y = x^2 -1 is point (2,3). The intersection of th... | 5 | [
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... | 19,318 | 19318 | |
approximations of distributions
June 20th 2010, 01:48 PM #1
Super Member
Joined
Jun 2008
Posts
829
approximations of distributions
In a multiple choice test have 200 questions, each with four possible answers, of which only one is correct. What is the probability that a student hit between 25 and 30 of 8... | 5 | [
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Coprime Theorem
April 23rd 2009, 02:37 AM #1
Senior Member
Joined
Apr 2009
From
Atlanta, GA
Posts
408
Coprime Theorem
Prove or give a counterexample:
For three positive integers $u_1<u_2<u_3$, if $gcd(u_2,u_3)=gcd(u_1,u_3)=gcd(u_1,u_2)=1$ then $gcd(u_1u_2u_3,u_2u_3+u_1u_3+u_1u_2)=1$
Note: T... | 5 | [
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game theory,transition matrix
February 25th 2009, 04:21 PM #1
Newbie
Joined
Feb 2009
Posts
1
game theory,transition matrix
1.a gambler with 2 dollar makes a series of one-dollar bets. His probability of winning one dollar is 2/5. He either wins one dollar or loses one dollar, he decides to quit playing a... | 4 | [
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Why is the Time component in the Space Time Interval negative?
fft
The origin can be traced to Einstein's OEMB paper. Einstein noticed that, when starting from the Lorentz transforms:
(1) [itex]x'=\gamma(x-vt)[/itex]
(2) [itex]t'=\gamma(t-vx/c^2)[/itex]
by differentiation, one gets:
(3) [itex]dx'=\gamma(dx-vdt)[/it... | 4 | [
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Initial Value Problem
September 5th 2011, 06:32 PM #1
Initial Value Problem
Find the solution to the initial value problem in explicit form.
$y' = xy^3(1 + x^2)^{-\frac{1}{2}}$ ; $y(0) = 1$
$\int \frac{1}{y^3}dy = \int \frac{x}{(1+x^2)^{\frac{1}{2}}}dx$
$-\frac{1}{2y^2} = (1 + x^2)^{\frac{1}{2}} + ... | 5 | [
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[SOLVED] division of an algebric expression
August 15th 2008, 11:56 AM
Neenoon
[SOLVED] division of an algebric expression
Please check if this is right:
$\frac {2^{-3}a^ \frac {2}{3} b^4}{2^{-2}a^ \frac {1}{6} b^4}$
$1^{-3-(-2)} a^{\frac {2}{3}-\frac {1}{6}} b^{4-4}$
$1^{-1} a^{\frac {4}{6}-\frac... | 4 | [
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Full-field unsymmetrical beam shaping for decreasing and homogenizing the thermal deformation of optical element in a beam control system
« journal navigation
Full-field unsymmetrical beam shaping for decreasing and homogenizing the thermal deformation of optical element in a beam control system
Optics Express, Vol.... | 4 | [
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Electrostatic Potential Energy
So then you're wanting to know how much work is required to charge a sphere?
So Work = V * q
As you bring the charges to the sphere, there will be work for each charge carried in from ∞. The average ΔV will be 1/2*V that the charges will need to be brought in against. That means for al... | 4 | [
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Another Related Rate Problem
November 5th 2010, 06:09 PM #1
Member
Joined
Mar 2010
Posts
150
Another Related Rate Problem
Here is the text of my problem:
A boy is flying a kite at a height of 150ft. If the kite moves gorizontally away from the boy at 20ft/s, how fast is the string being paid out whe... | 5 | [
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0.0020294189453125,
0.006195068359375,
-0.0255126953125,
0.0137939453125,
-0.08544921875,
0.0947265625,
0.103515625,
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0.0244140625,
0.09716796875,
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0.119140625,
-0.0294189453125,
0.... | 19,327 | 19327 | |
Derivative of inverse tan fuction
June 4th 2011, 09:20 PM #1
Member
Joined
Jun 2009
Posts
108
Derivative of inverse tan fuction
I was having trouble with the following question about finding the derivative of:
y=(tan^-1(x/2))^4
-i utilized the chain rule but this came out to be wrong.
\dis... | 5 | [
0.049560546875,
-0.01141357421875,
0.07470703125,
0.0205078125,
0.00433349609375,
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0.032470703125,
0.005035400390625,
0.049072265625,
0.07470703125,
0.007293701171875,
-0.030517578125,
0.11328125,
0.007080078125,
0.10546875,
0.00946044921875,
-0.042... | 19,328 | 19328 | |
Use Newton’s method with the specified initial approximation x1 to find x3.
phillyolly
Please verify my answer.
1. The problem statement, all variables and given/known data
Use Newton’s method with the specified initial approximation to find , the third approximation to the root of the given equation. (Give your a... | 5 | [
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0.006317138671875,
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0.109375,
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-0.08935546875,
0.035888671875,
-0.047119140625,
... | 19,329 | 19329 | |
Disk of Convergence
June 13th 2007, 04:59 AM #1
Member
Joined
Jun 2007
Posts
131
Disk of Convergence
(a) Determine the disk of convergence of the power series
(n^5)(z-3i)^n/4^n) for n=1 to infinity
(b) Use taylore theorem to determine the taylor series about 2i for the functio f(z) = Log(z+i), ... | 4 | [
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-0.0537109375,
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-0.1044921875,
-0.01470947265625,
-0.1... | 19,330 | 19330 | |
Numerical Integration of 2nd Order DE
bigfooted
Introduce the derivatives as new variables, say u=dx/dt and solve the system of 6 first order equations, where the second derivatives are replaced by the first derivatives du/dt etc.
so the last equation will be
dw/dt = k2*u - v
but you could also write it as:
dw/dt =... | 4 | [
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... | 19,331 | 19331 | |
Basic Chain Rule Problem with Trig Functions
October 23rd 2010, 08:22 PM
Tatsuya
[SOLVED] Basic Chain Rule Problem with Trig Functions
Hi, everyone. First post but I have a feeling I'll be coming back often. (Hi)
Problem: For what values of $x$ in the interval $[0,2\Pi]$ does the graph of $f(x)=\cos^2(x)+\s... | 5 | [
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0.01434326171875,
-0.06... | 19,332 | 19332 | |
How to prove that this function is bijective...
April 13th 2009, 11:35 AM #1
How to prove that this function is bijective...
Hi, how can I prove that $f:\mathbb{R} \to \mathbb{R}$, where
$f(x)=x^3+4x-\cos(\pi x)$
is a bijective function?
If the function were just $g(x)=x^3+4x$, the problem could be... | 5 | [
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0.01806640625,
0.0003376007080078125,
0.07373046875,
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0.083984375... | 19,333 | 19333 | |
Cost word problem
August 11th 2012, 12:29 PM
sarahh
Cost word problem
To shampoo a small dog at Pretty Pooches costs $20. When the owner of Pretty Pooches increases the price to have a small dog shampooed, the number of small dogs shampooed per day decreases. The
expression ax+b represents the number of smal... | 4 | [
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-0.03369140625,
0.017456... | 19,334 | 19334 | |
Lie derivative
mathwonk
explain seems to be arguing that even though the flow fixes the origin that it does not induce the identity on the tangent space there.
he's right about the action of the flow on the tangent bundle at the origin. but he also says that "there is no flow strictly at the center" which is incorr... | 4 | [
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0... | 19,335 | 19335 | |
Patent US6091787 - Symbol lock detector
Publication number US6091787 A
Publication type Grant
Application number US 08/997,859
Publication date Jul 18, 2000
Filing date Dec 24, 1997
Priority date Dec 24, 1996
Fee status Lapsed
Also published as CA2274718A1, EP0953242A2, WO1998028703A2, ... | 4 | [
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0.0164794921875,
-0.034912109375,... | 19,336 | 19336 | |
limsup and liminf
October 29th 2007, 08:12 AM
MKLyon
limsup and liminf
I have to find the limit superior and the limit inferior of these sequences:
a)
n + [(-1)^n](2n+1)
---------------- It appears limsup = 3 and liminf = -1.
n
b)
(an)^(1/n) where an = 1/(2^[(n+1)/2]) if n is odd and 1/... | 4 | [
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0.015869140625,
0.042236328125,
-0.010498046875,
-0.02197265625,
0.01513671875,
... | 19,337 | 19337 | |
Understanding of Higher-Order Derivatives
If [tex] f : \mathbb{R}^n \to \mathbb{R} [/tex], then the derivative of [tex] f [/tex] is a linear map [tex]\lambda : \mathbb{R}^n \to \mathbb{R} [/tex] at each point in [tex] \mathbb{R}^n [/tex].
That is to say, the derivative of [tex] f [/tex], properly considered, is a map [... | 4 | [
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0.005828857421875,
0.032958984375,
0.02783203125,
0.00012969970703125,
0.0434570312... | 19,338 | 19338 | |
Gauss Divergence Theorem
May 12th 2010, 09:31 PM
swinburneguy2009
Gauss Divergence Theorem
Please help with this one guys!! i really need solutions tonight if possible.
Verify the Gauss Divergence Theorem:
∫∫∫∇ ⋅F dxdydz= ∫∫ F .nˆ dA , where
S
the closed surface S is the sphere x2 + y... | 5 | [
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0.06982421875,
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-0.02587890625,
-0.050537109375,
0.00769042968... | 19,339 | 19339 | |
Polar Equation
Convert the polar equation r=2cosx to rectangular coordinates and sketch the graph
r should be $r=2\cos(\theta)$ since r is a function of the angle theta. The x and y coordinates can be found by the standard conversion: $x=r\cos(\theta)$ $y=r\sin(\theta)$ Look at this page for a
nice explanation of comm... | 4 | [
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0.05029296875,
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0.019775390625,
0.0849609375,
0.0255126953125,
0.005035400390625,
-0.1025390625,
-0.0441894... | 19,340 | 19340 | |
complex numbers and derivatives
May 31st 2008, 04:07 AM #1
Junior Member
Joined
Mar 2008
Posts
45
complex numbers and derivatives
Hi all,
I need some help with the following question:
the 257th derivative of e^(-t)*sint
When i do it, i get an answer of 2 ^(257/2)*i*(cost(t) + i*sin(t)) but... | 5 | [
-0.0576171875,
0.1318359375,
0.0103759765625,
0.047119140625,
0.00921630859375,
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0.043701171875,
0.099609375,
0.0400390625,
0.09912109375,
0.053955078125,
-0.07763671875,
0.06884765625,
0.049560546875,
0.0111083984375,
-0.08544921875,
-0.053466796875,
0.029174804687... | 19,341 | 19341 | |
Hyperbolic point
October 6th 2009, 02:50 PM
chiph588@
Hyperbolic point
Let $f : U \to \mathbb{R}^3$ be a surface element. Suppose that the image of $f$ lies in the region $\{(x, y, z) | z > 0 \}$, and the principal curvatures of $f$ at $f(0)$ satisfy $\kappa_1 \
kappa_2 < 0$. Show the tangent plane of $f$ at... | 5 | [
0.048095703125,
0.0400390625,
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0.08251953125,
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0.00225830078125,
0.0213623046875,
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0.08251953125,
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0.03662109375,
-0.0142822265625,
-0.0166015625,
-0.12451171875,
... | 19,342 | 19342 | |
definition of convergence of a sequence
September 23rd 2011, 02:40 AM #1
definition of convergence of a sequence
Hi guys,
I have just started learning elementary analysis and am trying to understand exactly what the precise definition of a sequence to converge means, despite doing well on the problems in the ... | 4 | [
-0.06201171875,
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0.06689453125,
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0.036865234375,
0.061279296875,
-0.039794921875,
-0.025390625,
-0.068359375,
0.10400390625,
0.000038... | 19,343 | 19343 | |
Entropy of Mixing for Two Ideal Gases at Different Temperatures
1. The problem statement, all variables and given/known data
Two monatomic ideal gases are separated in a container by an impermeable wall, with volumes [itex]V_{1}[/itex] and [itex]V_{2}[/itex], temperatures [itex]T_{1}[/itex] and [itex]T_{2}[/itex], num... | 5 | [
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0.033447265625,
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0.014404296875,
0.0390625,
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0.0242919921875,
0.056640625,
-0.00494384765625,
-0.06201171875,
-0.06787109375,
-0.0274658203125,... | 19,344 | 19344 | |
Solving double pendulum with runge kutta
January 5th 2011, 10:34 PM #1
Newbie
Joined
Feb 2009
From
Gauteng
Posts
5
Solving double pendulum with runge kutta
I have four first order differential equations (see attachement diff.jpg).
where
g= 9.8m/s
l1 = 0.216 m
l2 = 0.241 m
B = g/... | 4 | [
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0.0081787109375,
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0.06396484375,
0.01214599609375,
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0.056640625,
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-0.0791015625,
-0.033935546875,
0.0791015625,
-0.022216796875,
0.00674438476... | 19,345 | 19345 | |
Transposition Question
November 3rd 2009, 10:30 AM #1
Newbie
Joined
Nov 2009
Posts
2
Transposition Question
Hello first post.
I received a question as shown below but unfortuantely I keep on getting the answer as a Math Error on my calculator. I have tried the equation plenty of times but I keep on ... | 5 | [
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0.00860595703125,
0.00020885467529296875,
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0.03759765625,
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0.0277099609375,
0.049560546875,
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0.0076904296875,
0.10791015625,
-0.0908203125,
0.00830078125,
-0.00897216796875,
0... | 19,346 | 19346 | |
Fixed Points
February 10th 2011, 02:59 PM #1
Senior Member
Joined
Apr 2008
From
Vermont
Posts
318
Fixed Points
Suppose f is a real valued function on (-infinity; infinity): Call x a fixed point of f if f(x) = x:
(a) If f is differentiable and f'(t) is not 1 for every t, prove that f has at most o... | 5 | [
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0.0693359375,
0.02587890625,
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-0.044677734375,
-0.05517578125,
-0.096191... | 19,347 | 19347 | |
Continuity and f(c)=c
July 15th 2012, 01:02 PM #1
Newbie
Joined
Jul 2012
From
Alaska
Posts
13
[Solved] Continuity and f(c)=c
Thanks in advance for any help. I think I might just be missing something simple.
Problem:
Let f be a continuous function who's domain is the closed interval [0,1] and... | 5 | [
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0.0272216796875,
0.0240478515625,
0.000820159912109375,
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0.0498046875,
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0.047607421875,
-0.0262451171875,
-0.03515625,
-0.006134033203125,
-0.05908203125,
-0... | 19,348 | 19348 | |
Line touches curve at only one point
February 25th 2011, 04:01 AM #1
Super Member
Joined
Dec 2009
Posts
755
Line touches curve at only one point
Sketch the curve $C$ with equation $y^2+4x^2=4+2y$(i have no problem with this part)
If the line $y=2x+a$ touches the curve $C$ at only one point, show tha... | 4 | [
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0.0260009765625,
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-0.007720947265625,
0.027099609375,
-0.044189453125,
0.039306640625,
-0.0693359375,... | 19,349 | 19349 | |
Help with a Correlation coefficient proof
October 9th 2012, 03:36 PM #1
Newbie
Joined
Oct 2012
From
Montana
Posts
3
Help with a Correlation coefficient proof
This is the problem as I received it, I hope that someone can explain how to do it, as I am at a loss
Correlation Coefficient Definition*
... | 4 | [
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0.0050048828125,
0.04150390625,
0.0224609375,
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0.0830078125,
0.080078125,
0.0361328125,
0.0322265625,
-0.01385498046875,
0.004241943359375,
0.011... | 19,350 | 19350 | |
Trignometric Equations
March 18th 2008, 07:41 PM #1
Junior Member
Joined
Sep 2007
Posts
69
Trignometric Equations
Let f(x)=1-tan^2x and g(x)=tanx. Find the value of x in the interval (0, pie/2) where f(x)=g(x)
Can anyone help me with this question?
$f(x) = g(x)$
$1 - \tan^{2}x = \tan x$
... | 4 | [
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0.016357421875,
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0.03515625,
0.052734375,
-0.09619140625,
... | 19,351 | 19351 | |
Prove every set in [0,1], A, with positive measure has a non-measurable subset
March 13th 2010, 09:27 AM #1
Member
Joined
Feb 2010
Posts
147
Prove every set in [0,1], A, with positive measure has a non-measurable subset
I know there exists a non-measurable subset in [0,1). Call it P
I was thinking i... | 4 | [
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0.044189453125,
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0.0162353515625,
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0.07861328125,
0.064453125,
-0.061767578125,
-0.057373046875,
0.08447265625,
0.0212... | 19,352 | 19352 | |
Some Existence Results of Positive Solution to Second-Order Boundary Value Problems
Abstract and Applied Analysis
Volume 2014 (2014), Article ID 516452, 7 pages
http://dx.doi.org/10.1155/2014/516452
Research Article
Some Existence Results of Positive Solution to Second-Order Boundary Value Problems
^1School of Medic... | 5 | [
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-0.0576171875,
0.01806640625,
-0.08154296... | 19,353 | 19353 | |
Diagonalizable Matrix
November 14th 2006, 12:46 PM #1
Member
Joined
May 2006
Posts
148
Thanks
1
Diagonalizable Matrix
1.) Is the matrix A = [[3,1],[0,3]] diagonalizable? Explain.
Well, I know a matrix is said to be diagonlizable if A is similar to a digonal matrix, that is, if A = PDP^(-1) for s... | 5 | [
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-0.0181884765625,
0.006011962890625,
0.0020599365234375,
... | 19,354 | 19354 | |
Linear Algebra question
November 21st 2009, 01:49 PM
ewander
Linear Algebra question
Show that the non zero rows of an echelon form matrix form a linearly independent set.
That’s what it is?
(1) (0) (0) = (0)
c1(0) + c2 (1) +c3 (0) = (0) so c1=0, c2=0, c3=0
(0) (0) (1) = (0)
November 21st 200... | 5 | [
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Patent US5579993 - HVAC distribution system identification
CROSS REFERENCE TO RELATED APPLICATIONS
1. TITLE: Global Control of HVAC Distribution System
INVENTOR: Osman Ahmed
Ser. No. 08/369,425 filed Jan. 6, 1995 (pending Jul. 3,1996)
2. TITLE: Control of Prime Mover in HVAC Distribution System
INVENTOR: Osman Ahm... | 4 | [
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Proof of divisibility
Let n be an odd integer. Prove that n^3/n is divisible by 24.
$\frac{n^3}{n} = n^2$, which is not necessarily divisible by 24 if n is odd. Examples: $3^2 = 9, 5^2 = 25$. Perhaps you wrote the problem incorrectly?
OOps! Yes I did. The correct one is: Prove (n^3)-n is divisible by 24.(Smirk)
Ok. ... | 4 | [
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0.001220... | 19,357 | 19357 | |
Calc 3 help... second partial derivatives and differntials z = f(x,y)
November 8th 2010, 04:34 PM #1
Junior Member
Joined
Sep 2009
Posts
28
Calc 3 help... second partial derivatives and differntials z = f(x,y)
I am working on an assignment due tomorrow and am just having a hard time with some of this.... | 4 | [
0.0208740234375,
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0.0284423828125,
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0.0294189453125,
-0.12597... | 19,358 | 19358 | |
Calculating Distributed Capacitance of a Bifilar Coil?
berkeman
Bifilar windings are when the primary and secondary wires are wound together on the bobbin or core. It's generally done to minimize leakage inductance Lk, at the expense of much higher
winding-to-winding capacitance Cww.
http://en.wikipedia.org/wiki/Bi... | 4 | [
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... | 19,359 | 19359 | |
Particle physics - absorption length
JamesJames
1) What percentage of incident photon radiation passes through 5 mm of material whose absorption coefficient is 0.7 mm^-1? What is an absorption length? I am lost here. Any input ...some mathematical
formula for the absoprtion coefficient.....would be a great help to me.... | 4 | [
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... | 19,360 | 19360 | |
A problem involving Force in terms of time?
1. The problem statement, all variables and given/known data
There is a body of 3 kg which is moving to the right with a velocity of 10 m/s. A force of 6 N/s^2t^2 is applied on the body to the left. How much distane will the body have travelled from t=0 when
its velocity is 0... | 4 | [
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... | 19,361 | 19361 | |
Tracy Trigface
February 24th 2006, 08:17 AM #1
Newbie
Joined
Feb 2006
Posts
7
Tracy Trigface
To calculate the top of a tower, Tracy Trigface measured the angle of elevation to the top of the tower from point A and found it to be15*. She then moved 30m closer to the tower, over level
ground,to point B... | 4 | [
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-... | 19,362 | 19362 | |
Generators of matrix algebra
August 8th 2011, 02:11 PM #1
Generators of matrix algebra
Let $M_n(\mathbb{C})$ be the space of all $n\times n$ matrices with complex entries.
Consider the matrices
$u=\left(\begin{array}{cccc}1 &0 &\cdots &0\\0 &q &\cdots &\vdots\\0 &0 &\ddots &\vdots\\0 &0 &\cdots &q^{n-1}\... | 4 | [
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0.0220947265625,
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0.06640625,
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-0.003509521484375,
... | 19,363 | 19363 | |
Modeling Electromechanical Overcurrent Relays Using Singular Value Decomposition
Journal of Applied Mathematics
Volume 2012 (2012), Article ID 104952, 18 pages
http://dx.doi.org/10.1155/2012/104952
Research Article
Modeling Electromechanical Overcurrent Relays Using Singular Value Decomposition
^1Department of Elect... | 4 | [
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-0.005737304... | 19,364 | 19364 | |
Double checking and some help
February 5th 2009, 02:36 PM #1
Junior Member
Joined
Sep 2008
Posts
71
Double checking and some help
I need help with solving equations with substitution I'm stuck on problem. like
x=-4y
3x+2y=20
and
y= -x+6
3x+y=-10
Can you guys also help me doubl... | 4 | [
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0.0625,
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-0.07421875,
-0.0077514648... | 19,365 | 19365 | |
real analysis question
April 20th 2008, 06:32 PM #1
Member
Joined
Apr 2008
From
Seoul, South Korea
Posts
128
real analysis question
i need to prove that sin(x)-x=0 has a unique solution in the open interval (0,pi/2). indicate a computational procedure for finding that solution approximately. on the p... | 5 | [
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0.045166015625,
-0.07... | 19,366 | 19366 | |
Vector Problem
September 3rd 2009, 01:44 PM #1
Member
Joined
Sep 2008
Posts
117
Vector Problem
Could someone please verify if this problem is done correctly please. If not where did I go wrong.
The problem:
Use the component method to find the resultant(magnitude and direction) of the forces li... | 4 | [
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0.0272216796875,
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0.0184326171875,
-0.060546875,
-0.014770... | 19,367 | 19367 | |
Patent US20020140673 - Coordinate input apparatus, control method therefor, and computer-readable memory
FIELD OF THE INVENTION
[0001] The present invention relates to a coordinate input apparatus for detecting the three-dimensional position coordinates of an indicating tool used in combination with a display for disp... | 4 | [
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0.080078125,
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0.039306640625,
... | 19,368 | 19368 | |
A Spectral Relaxation Approach for Unsteady Boundary-Layer Flow and Heat Transfer of a Nanofluid over a Permeable Stretching/Shrinking Sheet
Advances in Mathematical Physics
Volume 2014 (2014), Article ID 564942, 10 pages
http://dx.doi.org/10.1155/2014/564942
Research Article
A Spectral Relaxation Approach for Unstea... | 5 | [
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Physics Forums - View Single Post - Reactive power with electromagnetic sources in free space
Good morning,
in circuit theory I know that reacting power arise from phasors and represents a power which can't be used, because not delivered to any load, but continuously flows back and forth between the load
and the gener... | 4 | [
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-0.061... | 19,370 | 19370 | |
Squeeze Theorem
September 7th 2010, 05:13 PM #1
Newbie
Joined
Apr 2008
Posts
13
Squeeze Theorem
During class today we started covering some stuff that had me totally lost. We were covering The squeeze theorem and I was doing really good up until
lim xsin 1/x
I haven't the faintest idea what he di... | 4 | [
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0.072265625,
-0.117187... | 19,371 | 19371 | |
Polynomial long division.
June 5th 2011, 07:48 AM #1
Newbie
Joined
Jun 2011
Posts
2
Polynomial long division.
Can someone help me to simplify this expression:
(x^8+x^6+x^4+x^2+1)/(x^4+x^3+x^2+x+1).
The solution is x^4-x^3+x^2-x+1, but I don't know how to get it.
Last edited by mr fantastic; ... | 5 | [
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0.0078... | 19,372 | 19372 | |
Some simple DiffEQ problems.
September 17th 2009, 03:49 PM #1
Junior Member
Joined
Feb 2009
Posts
40
Some simple DiffEQ problems.
The differential equation dx/dt = (1/10)*x*(10-x)-h models a logistic population with with harvesting at a rate h. Determine the dependence of the critical points on the param... | 5 | [
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0.052490234375,
-0.04052734375,
-0.0378... | 19,373 | 19373 | |
Lagrange multipliers
April 26th 2007, 08:14 AM #1
Newbie
Joined
Apr 2007
Posts
12
Lagrange multipliers
Q1) Find the ABSOLUTE MAXIMUM AND MINIMUM of the function f(x,y) = 4x^3 +y^2 subject to the constraint 2x^2 +y^2 =1 .
Q2) Find the MAXIMUM AND MINIMUM of the function f(x,y) = 4x^3 +y^2 subject to ... | 5 | [
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0.07373046875,
-0.0281982421875,
-0.0354... | 19,374 | 19374 | |
Patent US4680519 - Recursive methods for world-to-joint transformation for a robot manipulator
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention generally relates to a computer operated class of articulated robot manipulators and, more particularly, to continuous, iterative, real-time, computer con... | 4 | [
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0.07958984375,
-0.... | 19,375 | 19375 | |
Factoring response time equation
August 8th 2007, 02:39 PM
Heather
Factoring response time equation
Remember the calculation of response time in the lecture?
R = SQ + S(2)
Based on one Queuing Theorem:
Q = a * R(3)
Manipulating equations (2) and (3) using Factoring method, we obtain:
S
... | 4 | [
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-0.01989746... | 19,376 | 19376 | |
plz help me with a Similarity sum...
March 3rd 2009, 01:46 AM
snigdha
plz help me with a Similarity sum...
In a parallelogram ABCD, P & Q are mid-points of AB and DC respectively.
AB//PQ//DC. Join diagonal AC. AC and PQ intersect at R. Join BQ. RC and BQ intersect at S. If AS= 20cm, find,
1. triangle CQR... | 5 | [
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0.0218505859375,
-0.01287841796875,
-0... | 19,377 | 19377 | |
differential systems
April 23rd 2009, 11:39 AM
revolution2000
differential systems
when solving a system of differential equations of the form
dy/dt = Ay
The constant vector lambda is found with
|A - lambda * I| = 0
If lambda is a complex number I have the solution to
A = [4, -2; 5, 2]
... | 5 | [
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-0.07910... | 19,378 | 19378 | |
G is a group all of whose elements have order two: a^2=1, prove that it is abelian.
May 18th 2011, 09:31 AM #1
Newbie
Joined
May 2011
Posts
4
G is a group all of whose elements have order two: a^2=1, prove that it is abelian.
Please can you help me with this question?
Let G be a group all of whose e... | 5 | [
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0.14453125,
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0.060791015625,
-0.05126953125,
0.050... | 19,379 | 19379 | |
Advanced Integrals
May 9th 2007, 07:28 AM #1
Member
Joined
May 2006
Posts
148
Thanks
1
Advanced Integrals
Calculate the following line integrals by hand
1.) Note: this integral is a closed curve (so it has the o in the middle of the integral):
int_(C)(2xy – e^(cos(x^2) + 3x)dx + (sin(3y^2 +... | 5 | [
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-0.061767578125,
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0.07763671875,
-0.1025390625,
-0.05078125... | 19,380 | 19380 | |
Brevet US6633879 - Method and system for optimizing direct tables and trees
FIELD OF THE INVENTION
The present invention relates to computer systems and more particularly to a method and system for optimizing the combination of a direct table and trees for storing data.
BACKGROUND OF THE INVENTION
Currently, direct ... | 4 | [
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-0.061279296875,
0.06030... | 19,381 | 19381 | |
Kinematics problem help!
August 5th 2009, 09:55 PM #1
Newbie
Joined
Mar 2009
Posts
11
OK here is a really weird looking kinematics problem ...
A body is travelling at 20 m/s when it passes point P and 40 m/s when it passes point Q. Find its speed when it is halfway from P to Q, assuming uniform accel... | 4 | [
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0.059326171875,
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Urgent Calculus help needed?
October 13th 2008, 12:34 AM
Andrew1380
Urgent Calculus help needed?
Differentiation
Profit for a monopolist`s product, the cost function is
c=0.004q^3(to the power 3) + 20q + 5000
and the demand function is
p=450 - 4q
Find the profit-maximizing output
October ... | 5 | [
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... | 19,383 | 19383 | |
indecomposable module
January 24th 2009, 03:46 AM #1
Junior Member
Joined
May 2008
Posts
33
indecomposable module
define $R=\mathbb{Q}G$ where $G=<g>$ is a cyclic group of prime order p, then R is a module over itself (it's a ring). If $x=\sum g^i$ then I need to show that the set $\{y\in R \mid xy=0\}$ ... | 5 | [
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Limit involving the totient function and combination
up vote 1 down vote favorite
Hi,
Do you think the following limits are correct?
$\displaystyle\lim_{d\to\infty}\frac{\sum\limits_{k=1}^{d} {\phi(N) \choose k} {d-1 \choose k-1}}{\phi(N)^d}=0$
$\displaystyle\lim_{N\to\infty}\frac{\sum\limits_{k=1}^{d} {\phi(N) \ch... | 5 | [
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Differential Equations
$\frac{dv}{dt}=k v^{2/3}$ where $k= 3^{2/3} (4 \pi)^{1/3}$ Why doesn't this equation satisfy the hypothesis of the uniqueness theorem?
For semplicity let's suppose that $k=1$, so that the equation is... $v'= v^{\frac{2}{3}}$ (1) Writing a generic first order equation in the form... $v'= f(v,t)$ ... | 5 | [
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help with determinant problem....
January 15th 2009, 11:04 AM
JoanneMac
help with determinant problem....
Ok, here it is. I know how to do every single problem dealing with determinants except THIS one. This problem you have to solve the equation for 'x'. (Worried)
|0 0 -1|
| 3 x 0 | = x^2
| 2 0 3 |... | 4 | [
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The Ferris Wheel
1. The problem statement, all variables and given/known data
The figure below shows a Ferris wheel that rotates three times each minute. It carries each car around a circle of diameter 19.0 m.
a) What is the centripetal acceleration of a rider?
Answer in m/s^2
(b) What force does the seat exert on ... | 4 | [
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0.0971679... | 19,388 | 19388 | |
Crazy Hyperbola equation!
July 23rd 2009, 03:09 PM #1
Newbie
Joined
Jul 2009
Posts
1
Crazy Hyperbola equation!
Ok, the problem is to convert this to standard form...
9x^2-4y^2-18x+16y+11=0, but when I work it out, I get 9(x^2-2x=1)-4(y^2-4Y+4)=4...
This is not going to work out!
What is th... | 4 | [
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Radius of Fermi Sphere
1. The problem statement, all variables and given/known data
Problem 9.2(B) from Kittel Solid State Physics.
A two-dimensional metal has one atom of valence one in a simple rectangular primitive cell of a1 = 2Å and a2 = 4Å. Calculate the radius of the free electron Fermi sphere and draw this sp... | 5 | [
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... | 19,390 | 19390 | |
ACT problem
September 17th 2009, 01:20 PM
mimib1230
ACT problem
Hey everyone! You may expect to see more of these...plenty more. I can't figure these out :/
2. Two cyclists start biking from a trail's start 3 hours apart. The second cyclist travels at 10 miles per hour and starts 3 hours after the first cy... | 4 | [
0.0277099609375,
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-0.014282... | 19,391 | 19391 | |
Imaginary roots factoring help
July 29th 2009, 01:46 PM
diddledabble
$r^{2}-6r+6=0$
This might result in an $i$ root. I am not sure just stuck.
This is the determinant of my matrix and I need to find the eigenvalues. No square roots or fractions allowed. Must be a whole number or something like $2i$
Jul... | 5 | [
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-0.03466796875... | 19,392 | 19392 | |
Estimating an integral within a given tolerance (Simpson's)
August 24th 2009, 09:32 AM #1
Estimating an integral within a given tolerance (Simpson's)
My question is really just a clarification. When using the Simpson's error equation to determine the value of n needed to produce a certain level of accuracy, you t... | 5 | [
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Contour Integration
May 12th 2011, 11:24 AM
adam_leeds
Contour Integration
$\int_c\frac{{e}^{z } }{ ({{z}^{2 }-9 })^{2 } } dz$where c is the positively oriented circle $|z+2|=2$ So the formula is $\frac{2\pi i {f}^{(n-1) } (z)}{(n-1)! }$$f(z) = {e}^{ z} and n = 2$ So my
answer is $2\pi i {e}^{-3 }$ But accor... | 5 | [
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... | 19,394 | 19394 | |
Faster Multistep Iterations for the Approximation of Fixed Points Applied to Zamfirescu Operators
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 464593, 4 pages
http://dx.doi.org/10.1155/2013/464593
Research Article
Faster Multistep Iterations for the Approximation of Fixed Points Applied to Zamfirescu ... | 5 | [
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0.0... | 19,395 | 19395 | |
Couple of Carnot Cycle questions I can't get...
August 25th 2008, 11:13 PM #1
Junior Member
Joined
Nov 2007
Posts
29
Couple of Carnot Cycle questions I can't get...
These two questions are the only ones I can't get in this chapter. I don't even know where to start and would really appreciate help. Cheers... | 5 | [
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-0.01867675... | 19,396 | 19396 | |
Math Help
June 27th 2007, 07:53 AM #1
Member
Joined
Nov 2005
Posts
172
series
$\sum_{n=1}^\infty \frac{6}{n(n+2)}$
$\frac{6}{n(n+2)} = \frac{6}{n} - \frac{6}{n+2}$
$S_n = (6-\frac{6}{3}) + (\frac{6}{2}-\frac{6}{4}) + (\frac{6}{3}-\frac{6}{5})+$... $+ (\frac{6}{n} - \frac{6}{n+2})$
not su... | 4 | [
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... | 19,397 | 19397 | |
solve the following
January 28th 2007, 05:21 AM #1
Newbie
Joined
Oct 2006
From
Madrid
Posts
7
solve the following
kin the equation solve the following
16^k=2^2k+6
my classmate tells me the answer is k =3, is this right ?
Muchos gracias
Last edited by Greg; January 28th 2007 at 0... | 4 | [
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Epsilon Delta Proof
February 27th 2013, 11:18 PM #1
Newbie
Joined
Feb 2013
From
Spain
Posts
2
Epsilon Delta Proof
When proving that limit (x->5) 1/x = 0.2, find the largestδ > 0 that works for ε = 0.0025 = 1/400
My attempt: | 1/x - 1/5 | = | (5-x)/5x | = | (x-5) /5x | < ε. | (x-5) /5x | < 1/400 ... | 5 | [
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