content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Calculate displacement of a mdof sytem with ODE45?
4 Answers
Accepted answer
You're definitely on the right track. Write your equations in matrix form My' = -Ky where y is the 8-element vector you described. In this setting, M and K will be 8-by-8 matrices (which are
functions of t and y).
Then in MATLAB
f = @(t,y)... | 4 | [
-0.053466796875,
0.001007080078125,
0.0303955078125,
-0.05126953125,
0.01300048828125,
-0.000591278076171875,
-0.0034332275390625,
0.042236328125,
-0.07177734375,
0.057861328125,
0.07373046875,
-0.018798828125,
-0.01458740234375,
-0.00567626953125,
-0.048583984375,
0.064453125,
-0.11... | 5,600 | 5600 | |
solve equation
September 19th 2008, 08:50 AM #1
Member
Joined
Sep 2008
Posts
222
solve equation
If x^2-y^2=77 and x+y=11, what is the value of x?
I don't get why the correct answer is 9. Thanks in advance
But if you do like that, won't you have x in terms of y? I need a value of x with a number.... | 4 | [
-0.05615234375,
0.08642578125,
-0.059326171875,
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-0.0634765625,
-0.08837890625,
-0.024169921875,
0.0277099609375,
0.046875,
-0.026123046875,
0.06201171875,
0.05224609375,
-0.00799560546875,
-0.0025787353515625,
0.028320312... | 5,601 | 5601 | |
xpansions
(c) copyright Foundation Coalition (S. A. Fulling) 1998
Classes 25.T, 25.R, 26.M, 27.M
Taylor Expansions
Note: Since the Web does not yet speak Greek easily, we will use the Icelandic letter Ð for "theta", the pound sterling sign £ for "lambda", and the cent sign ¢ for "epsilon".
Introductory example: The... | 5 | [
-0.02587890625,
-0.0034027099609375,
-0.0177001953125,
-0.041259765625,
0.021240234375,
-0.0091552734375,
-0.052001953125,
0.05419921875,
0.06591796875,
-0.0203857421875,
0.03955078125,
-0.08154296875,
-0.00174713134765625,
0.044189453125,
0.07861328125,
-0.01104736328125,
-0.0412597... | 5,602 | 5602 | |
November 2
Since I'm using multinomial logistic regression inside
playerpiano
I was curious if there was an
importance-aware update
for it. The loss function I'm using is cross-entropy between a target probability vector $q$ and predicted probability vector $p$ computed from weights $w$ and input features $x$, \[
... | 4 | [
0.02783203125,
-0.043212890625,
0.017333984375,
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0.07861328125,
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0.0693359375,
0.00567626953125,
-0.0205078125,
0.09375,
0.00482177734375,
0.005706787109375,
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0.005462646484375,
0.01611328125,
0.07421875,
-0.0216064453125,
0.1098632... | 5,603 | 5603 | |
Fitting Distributions to Data
Fitting Distributions to Data With R
In “Fitting Distributions with R” Vito Ricci writes;
“Fitting distributions consists in finding a mathematical function which represents in a good way a statistical variable. A statistician often is facing with this problem: he has some
obser... | 5 | [
-0.09912109375,
-0.08056640625,
-0.050048828125,
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0.0230712890625,
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-0.0264892578125,
0.056884765625,
0.0673828125,
0.030517578125,
0.06640625,
-0.041748046875,
0.051513671875,
0.0018768310546875,
0.053466796875,
-0.1279296875,
0.03369140625,
-0.0... | 5,604 | 5604 | |
Parkland Formula Help
1. 0
Apr 23, '08 by
Dr.Nurse2b
Help please -
OK... I am working on my education here and focusing on treating burn victims... If I understand correctly the Parkland Formula is used to calculate flow rate...
4cc x Kg x BSA
1/2 over 1st 8 hours
1/2 over last 16 hou... | 4 | [
0.0191650390625,
0.05810546875,
0.06640625,
0.07470703125,
0.03857421875,
-0.08203125,
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0.11669921875,
-0.0166015625,
0.0311279296875,
-0.0235595703125,
-0.09326171875,
-0.048095703125,
0.053955078125,
-0.03271484375,
0.0201416015625,
0.003692626953125,
-0.01251220... | 5,605 | 5605 | |
MathGroup Archive: July 2004 [00193]
[Date Index] [Thread Index] [Author Index]
Re: customizing Integrate with Unprotect
• To: mathgroup at smc.vnet.net
• Subject: [mg49276] Re: [mg49273] customizing Integrate with Unprotect
• From: A... | 4 | [
-0.11083984375,
-0.03271484375,
-0.0302734375,
-0.039306640625,
0.00457763671875,
0.00104522705078125,
0.064453125,
0.044921875,
-0.00927734375,
0.06689453125,
0.07275390625,
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0.0546875,
0.03857421875,
0.0096435546875,
0.00653076171875,
0.0264892578125,
-0.013000488... | 5,606 | 5606 | |
[SOLVED] Trig Integrals
February 5th 2009, 07:50 PM #1
[SOLVED] Trig Integrals
Hey everyone!
Integrate.
$\int 59 cos^2 x \cdot sin (2x) dx$
Here is what I have done so far:
$59 \int (\frac{1}{2}(1 + cos 2x) \cdot (2 sinx cosx) dx$
Are those the correct identities to substitute in there?
... | 5 | [
-0.01300048828125,
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0.0390625,
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-0.024658203125,
0.026123046875,
-0.038818359375,
0.006622314453125,
0.0... | 5,607 | 5607 | |
Error in solving BVP using dsolve
I tried to solve a non linear coupled boundary value problem in MAPLE using DSolve command. The code is :
alias(eta = e, theta = t)
Eq[1] := 5*(diff(F(e), `$`(e, 3)))+(m+3)*F(e)*(diff(F(e), `$`(e, 2)))-(2*m+1)*(diff(F(e), e))^2-(4*m+2)*H(e)-(m-2)*e*(diff(H(e), e)) = 0
Eq[2] := diff(... | 4 | [
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-0.036376953125,
0.04541015625,
0.057373046875,
-0.07177734375,
-0.04150390... | 5,608 | 5608 | |
Math Help
April 7th 2010, 02:07 PM #1
Junior Member
Joined
Nov 2008
Posts
53
DCT
Here is the question:
Evaluate:
$<br /> \lim_{n\to\infty} \int_0^{\infty} (1 + {\frac{x}{n}})^{-n} sin{\frac{x}{n}} dx<br />$
$<br /> <br /> <br /> \lim_{n\to\infty} \int_0^{1} (1+nx^{2})(1+x^{2})^{-n}dx<br /... | 5 | [
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-0.08251953125,
-0.024169921875,
0.09326171875,
-0.068847656... | 5,609 | 5609 | |
Problems with symbolic solve solutions
Hi all,
I am having trouble using the solve function on symbolic
equations. I have managed to abuse it somehow so the
solutions I get aren't always correct.
Below I have attached code for solving 6 equations in 6
unknowns and testing the solution satisfies one of the
equations. ... | 4 | [
-0.06640625,
-0.11328125,
0.0546875,
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0.03564453125,
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0.062255859375,
0.06787109375,
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0.00156402587890625,
0.020263671875,
0.009521484375,
0.08837890625,
-0.0771484375,
-0.078125,
-0.02... | 5,610 | 5610 | |
Electric field
From Wikipedia, the free encyclopedia
In physics, an electric field is a field of force with a field strength equal to the force per unit charge at that point. Basically, it is a field in which a charge experiences a force. The concept
of an electric field was introduced by Michael Faraday.
The electri... | 4 | [
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0.01611328125,
0.0078125,
-0.07421875,
-0.00848388671875,
0.01300048... | 5,611 | 5611 | |
Apple Orchard
February 15th 2010, 12:36 AM
vance
Apple Orchard
Don't try to find an algebraic rule !!
the figure below is the graph of the annual yield , y(t), in bushels per year , from an orchard t years after planting. The trees take about 10 years to get established , but for the next 20
years they ... | 5 | [
-0.0279541015625,
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0.054931640625,
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0.083984375,
0.0859375,
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0.029541015625,
0.0625,
0.036376953125,
0.09375,
-0.054443359375,
-0.02978515625,
0.0... | 5,612 | 5612 | |
Rings theory....
November 28th 2008, 02:39 AM #1
Member
Joined
May 2008
Posts
86
Rings theory....
Hello everybody, thanks for reading....
I've got this question that I don't seem to be able to solve on my own :-\
R is a ring. x is an nilpotent (?) element in it - meaning that there exists some n ... | 5 | [
-0.034912109375,
0.107421875,
-0.011474609375,
0.1025390625,
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0.01507568359375,
-0.00127410888671875,
-0.06591796875,
-0.056884765625,
-0.02978515625,
-... | 5,613 | 5613 | |
[SOLVED] Finding Co-Ordinates of a Rectangle
May 9th 2010, 10:29 AM #1
Member
Joined
Sep 2009
Posts
148
Here's a question from a past paper which I have successfully attempted. My question is regarding part (iii). I have successfully figured out the co-ordinates by the following method:
Gradient... | 4 | [
-0.0279541015625,
0.038330078125,
-0.028076171875,
-0.12158203125,
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-0.018798828125,
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0.03173828125,
-0.029296875,
-0.018066... | 5,614 | 5614 | |
MATLAB
trainlm
Levenberg-Marquardt backpropagation
Syntax
net.trainFcn = 'trainlm'
[net,tr] = train(net,...)
Description
trainlm is a network training function that updates weight and bias values according to Levenberg-Marquardt optimization.
trainlm is often the fastest backpropagation algorithm in the toolbox,... | 4 | [
-0.0244140625,
-0.10302734375,
-0.06298828125,
0.01556396484375,
0.08642578125,
0.078125,
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0.049072265625,
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-0.031982421875,
0.05322265625,
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-0.09326171875,
-0.0927734375,
0.0072021484375,
0.037841796875,
-0.0189208984... | 5,615 | 5615 | |
Determine credit card interest?
January 18th 2009, 05:36 AM #1
Newbie
Joined
Jan 2009
Posts
8
Determine credit card interest?
How to determine credit card interest? I’m not sure how to use the example provided in my math book. It just does not seem to work for me.
Book example:
Previous Balance... | 4 | [
0.07373046875,
0.035888671875,
-0.0283203125,
0.026611328125,
-0.0286865234375,
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0.014892578125,
0.031494140625,
0.019287109375,
-0.08447265625,
0.0151... | 5,616 | 5616 | |
MathGroup Archive: February 2001 [00311]
[Date Index] [Thread Index] [Author Index]
Re: Problem: a matrix and a box...
• To: mathgroup at smc.vnet.net
• Subject: [mg27271] Re: [mg27268] Problem: a matrix and a box...
• From: Ken Levas... | 4 | [
0.0054931640625,
0.0498046875,
-0.0302734375,
-0.04541015625,
-0.00494384765625,
-0.0196533203125,
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-0.14453125,
-0.042236328125,
0.043212890625,
-0.02685546875,
0.033935546875,
0.019287109375,
-0.0052490234375,
-0.10107421875,
0.0042724609375,
-0.064453125,
-0.0118... | 5,617 | 5617 | |
Inflection points, concavity upward and downward
A point of inflection of the graph of a function $f$ is a point where the second derivative $f''$ is $0$. We have to wait a minute to clarify the geometric meaning of this.
A piece of the graph of $f$ is concave upward if the curve ‘bends’ upward. For example, the popul... | 4 | [
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-0.0322265625,
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0.08740234375,
0.09033203125,
0.055419921875,
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0.013427734375,
0.0830078125,
0.016845703125,
0.033935546875,
0.037841796875,
0.015380859375,
-0.0... | 5,618 | 5618 | |
ing
What is the definition of "inversely proportional"?
A relationship where a number either increases as another decreases or decreases as another increases. Inversely proportional is the opposite of directly proportional.
Learn more about inversely proportional in the class Parallel Circuit Calculations 205... | 4 | [
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-0.0556640625,
-0.0205078125,
0.0263671875,
0.0810546875,
-0.13... | 5,619 | 5619 | |
WHAT WILL HAPPEN IN THE NEXT GENERATION?
What will happen in the next generation? To answer this question, we will use the Hardy-Weinberg principle, which applies basic rules of probability to a population to make predictions about the next
generation. The Hardy-Weinberg principle predicts that allelic frequencies r... | 4 | [
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-0.04345703125,
-0... | 5,620 | 5620 | |
Roots of Quartic Equations. Cardano's Formula.
Let us consider, for rational numbers a,b,c,d, an equation
Let
be the roots of this equation and let L be a field generated by the set Q of rational numbers and these roots.
The Galois group Gal L/Q of this equation is a group S4 of all permutation of four elements. We... | 4 | [
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0.0556640625,
-0.051025390625,
0.10791015625,
-0.09130859375,
0.074... | 5,621 | 5621 | |
Derivative Calculator
Expressions and Derivative Rules for the Derivative Calculator
Expressions
The expressions entered into the text field in the Derivative Calculator may include any combination of the following:
• x + y: addition
• x - y: subtraction
• x * y: multiplication
• In many situations, the aste... | 5 | [
-0.0703125,
-0.044189453125,
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0.00927734375,
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0.0849609375,
0.039794921875,
0.00848388671875,
-0.06689453125,
0.067382812... | 5,622 | 5622 | |
Proof of De Morgan’s Law | Definition of De Morgan’s Law | Examples
Proof of De Morgan’s Law
Here we will learn how to proof of De Morgan’s law of union and intersection.
Definition of De Morgan’s law:
The complement of the union of two sets is equal to the intersection of their complements and the complement of th... | 4 | [
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0.0712890625,
0.006317138671875,
-0.0172119140625,
-0.0201416015... | 5,623 | 5623 | |
Roots of this auxiliary eqn?
I'm trying to find the auxiliary roots of this DE $y'''+iy=0$ So the auxiliary eqn is $m^3+i=0$ and m=i ?
Use De Moivre's formula to find the three roots. EDIT: $-i = e^{-i \pi /2} = \cos(-\pi/2) + i \sin(-\pi/2)$ $(-i)^{1/3} = e^{i(-\pi/6 + 2k \pi/3)} = \cos (-\pi/6 + 2k \pi /3) + i \sin(... | 5 | [
-0.03466796875,
-0.0390625,
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0.07275390625,
0.01904296875,
-0.01220703125,
0.05322265625,
0.0... | 5,624 | 5624 | |
Math in the Media
June 2004
The Pythagorean Theorem of Baseball has just been simplified. This news from the web-based Science Daily for March 30, 2004. The original PTOB is due to the baseball statistician and conoisseur Bill
James. It estimates a team's winning chances in terms of two numbers: R[s], the number of ... | 4 | [
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0.03466796875,
-0.0595703125,
0.0029754638671875,
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0.1298828125,
0.04296875,
0.130859375,
-0.07861328125,
0.04736328125,
-0.007537841796875,
-0.00127410888671875,
0.04443359375,
-0.0230712890625,
-0.032470703125,
-0.03... | 5,625 | 5625 | |
Calculation of optimum selling price using differential calculus
By Jackie, Researcher
Topic: Education
Area of discussion: Management and Cost Accounting
Chapter: Pricing decisions and profitability analysis
The primary objective of this posting is to demonstrate the computation of optimal selling prices using ... | 4 | [
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... | 5,626 | 5626 | |
No Tight Projective Plane
No Tight Projective Plane:
To show that there is no tight immersion of the real projective plane, Kuiper used the fact that a tight immersion of a surface M can be decomposed into two components, M+ and M-, with the following
properties:
1. The curvature is non-negative on M+ and non-posi... | 4 | [
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0.0245361328125,
... | 5,627 | 5627 | |
The Japanese Theorem for Nonconvex Polygons - Carnot's Theorem for Cyclic Polygons
Carnot's Theorem for Cyclic Polygons
In order to prove the Japanese theorem we need to generalize Carnot's theorem to cyclic polygons.
Carnot's theorem for cyclic polygons. Suppose \(P\) is a cyclic \(n\)-gon triangulated by diagonals.... | 5 | [
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on
4B-2 : Heat Transfer Through the Wall of a House 3 pts
An insulated frame wall of a house has an average thermal conductivity of 0.0318 Btu/h-ft-°R. The wall is 6 in thic... | 5 | [
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Latin
The Latin Square design
The Latin square design is used where the researcher desires to control the variation in an experiment that is related to rows and columns in the field.
Field marks:
• Treatments are assigned at random within rows and columns, with each treatment once per row and once per column.
... | 4 | [
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Math Help
September 24th 2008, 12:50 PM #1
Member
Joined
May 2008
Posts
138
Derivitives
Find f '(a).
$f(x) = \frac{1}{\sqrt{x+6}}$
plugging this into the formula i get
$<br /> \lim_{h \to 0} \frac{\frac{1}{\sqrt{x+h+6}}-\frac{1}{\sqrt{x+6}}}{h}$
which simplified all the way down to
... | 4 | [
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tion
Derivation of Coordinate Transformations
To derive an expression for Lorentz Contraction, begin with the following postulates:
• The laws of physics are the same in all inertial frames of reference
• The speed has the same value, c, in all inertial frames
Consider two frames, one which will be assumed to be... | 4 | [
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thee permutations and combinations question....please help
June 3rd 2010, 02:04 PM
cantcount
thee permutations and combinations question....please help
1)how many numbers between 2500-6500
using 1,2,3,4,5,6,7 without any repitition
i answered
5P1 3P1 7P1 7P1=735
2)Jack needs to answer 5 out of ... | 4 | [
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Absolute value equation
Moderator
Registered: 2010-06-20
Posts: 6,092
Re: Absolute value equation
Sabbir
Guest
Re: Absolute value equation
Could you please show the solving?
Member
Registered: 2012-07-20
Posts: 236
Re: Absolute value equation
Hi!
The general approach to absolute valu... | 4 | [
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[US Patent & Trademark Office, Patent Full Text and Image Database] [Home] [Boolean Search] [Manual Search] [Number Search] [Help] [HIT_LIST] [Bottom] [View Shopping Cart] [Add to Shopping Cart]
[Image] ( 1 of 1 ) ------------------------------------------------------------------------------- United States Patent 5... | 4 | [
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Undetected Failures of Threat Protection
Consider a system consisting of two redundant units, each equipped with protection from a common threat (such as lightning, inclement weather, etc), and suppose failure of the protection occurs at
the rate r and is undetectable until the unit is subjected to the external threat... | 4 | [
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Multiline Formulae in LaTeX
Consider the problem of typesetting the formula
It is necessary to ensure that the = signs are aligned with one another. In LaTeX, such a formula is typeset using the eqnarray* environment. The above example was obtained by typing the lines
\begin{eqnarray*}
\cos 2\theta & = & \co... | 5 | [
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... | 5,637 | 5637 | |
Binomial expression help!
January 30th 2006, 04:25 AM #1
Junior Member
Joined
Oct 2005
Posts
30
Binomial expression help!
Find the first three terms in these expansions in ascending powers of x
a) (x+1/x)^6
b) In the expansion of (1+x/2)^n in ascending powers of x the coefficent of x^2 is 30. Fi... | 4 | [
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Solve ydx+xdy=0
September 30th 2010, 08:44 AM #1
Junior Member
Joined
Jun 2010
Posts
58
Solve ydx+xdy=0
solving the following diff eq:
ydx+xdy=0
a simple one indeed, i saw it as y being a partial derivative of a function U(x,y) in order to x and x being the partial derivative of the same functi... | 5 | [
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Story Problems: Make Them Real (Part 2)
how to make story problems real; if you haven’t read that article yet, go take a look before you continue with this one.
I’ve got another one for you that’s in that same vein: the math topic is different, but the “story” idea still hold in general. This one has something extra ... | 4 | [
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0.045654296875,... | 5,640 | 5640 | |
How To Solve For Covariance
How To Calculate Covariance
Covariance tells you how closely related two variables are. Here, we will explain what covariance is, as well as showing you step by step everything you need to know to calculate it!
Hi, I'm Dr. Shah. I was the national lecture competition winner in 1999, and I'... | 4 | [
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Counting seating arrangements at a circular table
up vote 1 down vote favorite
Lets say you have a circular table that seats $n$ people and $b\lt n -1$ identitcal boys. If you were to divide the boys into $k$ teams of size $\geq 1$, how many ways are there to seat the boys so
that the teams sit together and have at le... | 5 | [
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Tangents Lesson Plans & Worksheets :: 161 - 180
Tangents Teacher Resources
Find Tangents educational ideas and activities
Showing 161 - 180 of 679 resources
In this problem you are given an angle of elevation and one side of a right triangle to find a missing side. Watch the instructor explain how to use the tangent... | 4 | [
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... | 5,643 | 5643 | |
Items tagged with speed
Hi MaplePrime-ers!
I've been using the Maple(17) toolbox in Matlab(2012b) to quickly enumerate systems of equations by: (i) solving them symbolically, (ii) using unapply to make them functions, (iii) then supplying the
points (driver equations) to get the system solution. Speed is a must, becau... | 4 | [
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0.0625,
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-0.0037078857421875... | 5,644 | 5644 | |
Survival
7.1 The Hazard and Survival Functions
Let T be a non-negative random variable representing the waiting time until the occurrence of an event. For simplicity we will adopt the terminology of survival analysis, referring to the event of
interest as `death' and to the waiting time as `survival' time, but the t... | 4 | [
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Terrain Tutorial
[Previous: The Fault Algorithm] [Next: Simple Variations]
Terrain Tutorial
Implementation Details
In this section we'l... | 4 | [
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Easter
In the Christian world, Easter (and the days immediately preceding it) is the celebration of the death and resurrection of Jesus in (approximately) AD 30.
Easter Sunday is the first Sunday after the first full moon on or after the vernal equinox.
The calculation of Easter is complicated because it is linked t... | 5 | [
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Finding the area of the shaded figure
Could anyone tell me how to do these two? http://i212.photobucket.com/albums/c...4/mathhelp.jpg<--- the side numbers are all 5's
If your drawing is accurate, no. On the other hand, if the first is a circle inside an 8x8 square, yes. That's 64 - area of circle with radius 4 (area =... | 4 | [
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Control Systems/Stability
From Wikibooks, open books for an open world
Stability[edit]
When a system is unstable, the output of the system may be infinite even though the input to the system was finite. This cause a number of practical problems. For instance, a robot arm controller
that is unstable may cause the robo... | 4 | [
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Problems and Solutions
Re: Problems and Solutions
Re: Problems and Solutions
That's it. I posted that as a genuine question and then realised the flaw a while later.
Your 1000! problem is very interesting. I think it would have zeroes, but I might have made a mistake somewhere.
Why did the vector cross the road?
It... | 5 | [
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Items tagged with program
Hi all
I have following program to solve time delay system...
the solution is good by choosing r:=11... but for r greater than 11(e.g r=20) the system take about4-5 minute to do and then it says:"" K2:=simplify(inverse(K1)):Error, (in minor) object too large""
and for plotting says:"" Warnin... | 4 | [
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Polyominoes
Polyominoes and Related Families
Tiling Rectangles with Polyominoes
In this section, we approach the problem of tiling a rectangle by using pieces taken from a set of polyominoes. Naturally, the area of the rectangle has to be equal to the sum of the areas of the
individual pieces in the set. Thus, we im... | 4 | [
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0... | 5,652 | 5652 | |
Mobius transformation
October 26th 2009, 09:23 PM
thespian
Mobius transformation
Sketch:
w=((i+z)/(i-z))
for:C\{z=x+iy,x≤0,y=0}
So basically for all z, ecxluding :x is less than or equal to zero and y=0.
I have solved for z which gives me:
z=((wi-i)/(w+1))
What is the easiest way to g... | 4 | [
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Capacitance Model
Please use the model bsim3_tutor_cv.mdl provided with the BSIM3v3 Modeling Package to visualize the capacitance model parameters. Load the file into IC-CAP and run the different macros to see how
certain parameters affect the device behavior of a deep submicron MOS transistor.
The capacitance in a M... | 4 | [
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-0.006072998046875... | 5,654 | 5654 | |
fun with logic
Member
Registered: 2005-11-24
Posts: 455
Re: fun with logic
Member
Registered: 2005-08-04
Posts: 394
Re: fun with logic
This is kind of lame, but bear with me.
Lay them on their sides so that they form a square. Two glasses on opposite ends of the square are one glass-length ... | 5 | [
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Trigonometric identities
October 10th 2009, 10:42 AM
BeckyDWood
Trigonometric identities
Please help with any of the following..
Prove these identities
cos2x = (1 - tan^2 x)/(1 +tan^2 x)
cos2x = cos^4 x - sin^4 x
cosec2x + cot2x = cot x
sin2x = 2tanx / (1 + tan^2 x)
tan x = sqrt... | 4 | [
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2.1.3 Schottky
Schottky- defects use the second simple possibility to maintain charge equilibrium in ionic crystals with two atoms in the base; they consist of the two possible types of vacancies which
automatically carry opposite charge.
Look at the illustrations in the link for visualizations of Schottky defects ... | 4 | [
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Problem with vectors
January 7th 2013, 09:54 AM
MMCS
Problem with vectors
Question
Forces of magnitude 3 Newtons, 5 Newtons and 7 Newtons act along the vectors (-3,-2,-9) (8,5,-9) (4,-1,-9)
Find the x component.
I have the answer at 4.968 however i can not arrive at it, attached is my working out.... | 4 | [
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Conquering the Perihelion
8.10 Conquering the Perihelion
O you who by the light of nature arouse in us a longing for the light of grace, so by means of that you can transport us into the light of glory; I give thanks to you, because you have lured me into
the enjoyment of your work, and I have exulted in the works o... | 4 | [
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Calculation of Limiting Reagent/Yield
Calculation of Limiting Reagents and Yield in Reactions
We begin with high school chemistry balance the reaction. For example,
PBr[3]
CH[3]CH[2]CH[2]OH > CH[3]CH[2]CH[2]Br
... | 4 | [
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Example 8.3.6 (b): Power Series Examples
Write the following series in sigma-notation and list the general term
a[n]
:
1. 1 + 2x + 3x^2 + 4x^3 + ...
2. 1 - 1/2 x + 1/4 x^2 - 1/8 x^3 + 1/16 x^4 ...
3. 3/2 x + 4/6 x^2 + 5/24 x^3 + 6/120 x^4 + ...
Here we need to determine the general term a[n] so that we can rewr... | 4 | [
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Help Calculate Tangent Equation to Two Circles
January 21st 2008, 05:35 PM #1
Newbie
Joined
Jan 2008
Posts
8
Hi all, I am struggling to finish this problem and was seeing if anyone could help me.
There are two circles.
Circle 1 has a center at (2,4), and radius 4.
Circle 2 has a center at (1... | 5 | [
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Trig Identities Help? Thanks!
February 11th 2010, 02:15 PM
Justinram22
Trig Identities Help? Thanks!
Ok, I have a couple of questions on my homework that i just can't figure out how they work....
"Verify that each equation is an identity"
Cos^4(s)-sin^4(s) = cos2(s)
I'm a little confused as the h... | 4 | [
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HELP coordinate geometry
Moderator
Registered: 2005-06-28
Posts: 12,919
Re: HELP coordinate geometry
davit
Guest
HELP coordinate geometry
got a problem i need help with in coordinat geometry i have lines 3x-y=13, and 3x-4y=25 that intercept at point M. and line 4x+3y=12 i need to find the equation o... | 4 | [
-0.0224609375,
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0.036... | 5,664 | 5664 | |
GCSE Probability Question
October 22nd 2009, 01:25 PM #1
Newbie
Joined
Oct 2009
Posts
1
GCSE Probability Question
Hi all, I'm stuck on this question from a mock paper. Any help you can give would be greatly appreciated. Thanks.
Paula is going to France for a holiday. She can travel by ferry, plane o... | 4 | [
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Solve equation
March 9th 2011, 12:26 PM #1
Newbie
Joined
Apr 2009
Posts
5
Solve equation
Solve the equation over the intervals [0,2pi)
3cosx + 3 = 2sin²x
2sin²x - 3cosx - 3 = 0 Put it all on one side
1-2cos²x - 3cosx - 3 = 0 Used the pythagorean identity that Sin²x + Cos²x = 1
-2cos²x... | 4 | [
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Measure-theoretic Probability: Why it should be learnt and how to get started
Home
>
Informal Classroom Notes
> Measure-theoretic Probability: Why it should be learnt and how to get started
Measure-theoretic Probability: Why it should be learnt and how to get started
Last Friday I gave an informal 2-hour talk at t... | 4 | [
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... | 5,667 | 5667 | |
Human effective population size
The myriad throng:
Human effective population size
Several weeks ago, we reviewed how a newly documented trove of... | 4 | [
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STEP Maths I, II, III 1994 Solutions
1.
2.
(Original post by nota bene)
STEP III Q5
So we have
.
Meaning: Where k= 0, 1, 2...
So the coefficients of the terms are
etc. so the MacLaurin expansion is
To find the po... | 5 | [
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chapt2_1_2maple.html
The Maple notebook is chapt2_1_2.mw but you are warned that it may download as a text file.
Explorations of the Alternating Harmonic Series
This notebook provides explorations of the rearrangements of the alternating harmonic series. Click on the formula given below and then press the ENTER key. ... | 4 | [
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0.03515625,
0.0057373046875,
... | 5,670 | 5670 | |
Electrical properties of a membrane
Next: Numerical solution of passive Up: Passive cell models Previous: Ion concentrations and equilibrium
The simplest representation of a piece of nerve membrane is a simple RC- circuit as shown in Figure 1. The capacitance of a typical membrane, C[m] arises due to the fact that... | 4 | [
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Overtime Pay
For most employees, overtime begins after working 44 hours in a work week, regardless of whether they are full-time, part-time, students or casual employees. After 44 hours, they must receive
overtime pay for each hour worked, which is a minimum of 1.5 times the employee's regular rate of pay (often called... | 4 | [
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Math Help
December 11th 2008, 06:37 AM #1
MHF Contributor
Joined
Sep 2008
From
West Malaysia
Posts
1,261
sets prove
Prove the following identities , for any sets A , B and C .
(a) (A u B) n ( B u C) N ( C u A )=( A n B ) u ( A n C ) u ( B n C )
(b) A n ( B - C) = ( A n B ) - ( A n C )
... | 5 | [
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-0.0230712890625,
-0.00680541992... | 5,673 | 5673 | |
Circles - Please Help
October 9th 2008, 04:47 AM #1
Senior Member
Joined
Jul 2008
Posts
347
Two circles touch internally at a point A and the smaller of the two circles passes through O, the centre of the larger circle. AB is any chord of the larger circle, cutting the smaller circle S.
The tangents t... | 4 | [
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-0... | 5,674 | 5674 | |
The 450 Pound Problem (x^3 + y^3 = 6z^3)
On New Year's Eve, 1994, an announcement appeared on the Internet
stating that The Sunday Telegraph of London had offered a cash prize
(450 pounds sterling) to the first person to send them a solution
in co-prime positive integers greater than 100 of the equation
... | 5 | [
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-0.0... | 5,675 | 5675 | |
MathGroup Archive: January 2010 [00386]
[Date Index] [Thread Index] [Author Index]
Re: I->-I, my solution. See examples at the end. Improvements/ suggestions/
• To: mathgroup at smc.vnet.net
• Subject: [mg106445] Re: [mg106423] I->-I, m... | 4 | [
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0.08837890625,
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0.0874... | 5,676 | 5676 | |
Word Problem Help
May 25th 2009, 12:45 PM #1
Newbie
Joined
May 2009
Posts
4
Word Problem Help
Can someone show me how to do this question? Thanks.
Ralph works part-time for a bike repair shop. He earns $2 for each tire he installs and $5 for each gear mechanism he assembles. Last week he did a total... | 4 | [
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Division by a prime ≡ 3 (mod 4)
November 4th 2010, 06:59 PM
kimberu
Division by a prime ≡ 3 (mod 4)
Hi,
"If p is a prime congruent to 3 (mod 4) and $x^2 + y^2$ is congruent to 0 (mod p), show p divides x and p divides y."
I tried to solve by contradiction, saying that if p doesn't divide x then it does... | 4 | [
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Analytic Functions, The Magnus Effect, and Wings
The essential features of aerodynamic lift can be explained in terms of two-dimensional potential flow, which satisfies the Laplace equation
[]
where f(x,y) is the vel... | 4 | [
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munkres
Munkres' Assignment Algorithm
Modified for Rectangular Matrices
Notice: This page has been updated. Earlier version is here.
Assignment Proble... | 4 | [
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0.0... | 5,680 | 5680 | |
Differentiation Questions
February 13th 2011, 10:54 AM #1
Member
Joined
Oct 2009
Posts
123
Differentiation Questions
Can someone please help me with these 2 questions.
1. f (x) = 7/x^4 - 3/x^3 + 1/x^(1/3)
the answer i get is:
-28/x^5 + 9/x^4 ... but the third part is killing me... can some... | 5 | [
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0.01031494140625,
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How to Design Solar PV System - Guide for sizing your solar photovoltaic system
What is solar PV system?
Solar photovoltaic system or Solar power system is one of renewable energy system which uses PV modules to convert sunlight into electricity. The electricity generated can be either stored or used
directly, fed b... | 5 | [
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In multiplication of algebraic expression before taking up the product of algebr
Multiplication of Algebraic Expression
In multiplication of algebraic expression before taking up the product of algebraic expressions, let us look at two simple rules.
(i) The product of two factors with like signs is positive, and th... | 4 | [
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Crystal growth simulation software.
Theoretical background.
Very moderate scientific background is needed to understand a material in this section. Preliminary runs of the program will make a great help to easy accommodate basic concepts.
The crystal growth is a phase transition process with sharp border between it a... | 4 | [
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Finding all roots of a logarithm function (with pa
summersyu Yu wrote:
> I found that the two roots have the following forms:
>
> root1=-a/c*lambertw(-c/a*exp(b-c)/a)-1;
> root2=-a/c*lambertw(-1,-c/a*exp(b-c)/a)-1;
Were you able to prove that, or did you extract that from my earlier response
where I indicated without... | 4 | [
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itative Reasoning in Small Groups
December 2006
Let's start with an item from page 154 of Martin Gardner Presents (Kaufman and Greenberg, 1993), originally published in Octet by Karl Fulves (1981), which seems to have started life as a blackboard
puzzle in a Russian high school science magazine called Quant.
Hand out... | 5 | [
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STEP I, II, III 2002 Solutions
(Original post by adrienne_om) Above from --- http://www.thestudentroom.co.uk/show...1#post19333071 Maybe a correction here -- I'm not sure -- but I got a positive sign in the RHS of the second
equation ---
Seems Paper II Q1 has a bad solution here: http://www.thestudentroom.co.uk/show..... | 5 | [
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How can we prove these sets are countable?
February 3rd 2009, 09:35 AM #1
Junior Member
Joined
Nov 2008
Posts
53
How can we prove these sets are countable?
a) The set of all numbers with two distinct decimal expansions(like 0.5000..., and 0.4999...)
b) The set of all rational points in the plane
... | 5 | [
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Numerical Ability Test Questions and Answers
Home > Numerical Tests > Numerical Ability > Numerical Ability Questions
A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?
Answer & Explanation:... | 4 | [
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FizzBuzz -- Version 2.0
Jipstyle wrote:
CrashTECH wrote:
Interesting indeed. I will try to work on this over the coming week while on vacation
As the pro dev in the group, I think you should handle the new proof.
I might give you to the end of the weekend to solve it .. but I admit that I'm impatient. The last one ... | 5 | [
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pl
Non-Transitive Dice
Main Concept
Imagine you are playing a game with a friend in which each of you chooses one die from the followin... | 5 | [
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Semi-supervised Naive Bayes in Python
Expectation-Maximization
The Expectation-Maximization (EM) algorithm is a popular algorithm in statistics and machine learning to estimate the parameters of a model that depends on latent variables. (A latent variable is a
variable that is not expressed in the dataset and thus th... | 4 | [
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ion
Computational Order Statistics
4. Extensions and Forthcoming Features
Thus far, this article has assumed that we are dealing with samples of iid variables. In this section, we take the major step of relaxing these assumptions. The generalisation to non-identical
distributions is an enormously flexible and powerfu... | 4 | [
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Can somebody teach me about logarithms?
July 10th 2009, 08:28 AM #1
Can somebody teach me about logarithms?
Okay, so I'm just trying to run through this study guide and at the present time I'm on logarithms before it progresses to complex numbers. I just looked at this math latex site I usually go on
to try a... | 4 | [
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sequential experiments: probability
Member
Registered: 2005-07-24
Posts: 445
Re: sequential experiments: probability
cubix
Guest
sequential experiments: probability
This probelm concerns random number generation. The gist of the probelm is that 10 numbers are selected from the interval [0,1], and go... | 4 | [
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Help about ratio and proportion
May 30th 2010, 10:40 PM
navikhi
Help about ratio and proportion
The ratio between the incomes of two people is 5:3. The ratio between their expenditures is 8:5, while the ratio between their savings is 4:3. What will be the ratio between their combined
Incomes and Combined Exp... | 4 | [
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Gradually Varied Flow Calculation. Backwater profile
┌─────────────────────────────────────────────────────────────────────────────┬┐
│ Gradually Varied Flow in Trapezoidal Channel ... | 4 | [
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Wilcoxon Match-Pairs Signed Ranks Test, W
{From the Institute of Phonetic Sciences (IFA): http://www.fon.hum.uva.nl/}
This is a. useful test to see whether the members of a pair differ. It resembles the Sign-Test in scope, but is much more sensitive to treatment effects. In fact, for large numbers of cases this test
... | 5 | [
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Useful Latex Bead Formulae
This number average diameter, D, is given in µm. It is determined by transmission electron microscopy using a diffraction grating replica as a calibration standard. If special traceability is
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