
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:23 AM
micromass

1 
37,920 
So, out of curiosity, when you guys see log(x) do you assume base 10 or base e?
Because I just wasted 2 hours of...

T 11:35 PM
olivermsun

3 
4 
I know not all shapes satisfy this relationship, but what is your intuition behind this formula that finds area...

T 11:10 PM
WWGD

7 
70 
Hi,
I visited my Mother and Stepfather recently, and admired the tall trees around their house.
We estimated...

T 09:00 PM
infinity149

9 
1,661 
I know how to factorize a polynomial over C, but what do complex factors show? Real factors show where the graph cuts...

T 02:37 PM
Hertz

2 
99 
Hi everyone. I hope this is in the proper place  not sure where to put it.
Anyway, I am working on an optimization...

T 01:31 PM
Wolfman29

4 
269 
Hi,
I found this derivation at wiki: http://en.wikipedia.org/wiki/Shell_theorem
Can someone tell me if the theorem...

T 09:30 AM
HallsofIvy

1 
66 
Hello,
Is there any formula that describes every other odd number, for ##n = 1,2,\dots##? I can't seem to find...

Y 07:14 PM
HallsofIvy

6 
175 

 
 
 
Theoretically it is said that, tangent touches to a single point on a circle. But If my circle is very big, and large...

Y 12:42 PM
adrianmitrea

10 
274 
Hi there,
Consider a related rates problem,
Gas is being added into a balloon at a rate of dE/dt = x ft^3/sec ...

Jul2614 04:33 PM
micromass

20 
504 
Hi, all. I'm in desperate need of assistance with a matrix I can't get my head around of. I want to solve a system of...

Jul2614 03:24 PM
skujesco2014

0 
146 
Suppose T=T(r,θ)=G(x,y)
How do you prove ∇T(r,θ)=∇G(x,y)?
I can think of some arguments in favor of this equality,...

Jul2614 09:10 AM
davidbenari

3 
259 
If you rotate your rectangular coordinate system (x,y) so that the rotated x'axis is parallel to a vector (a,b), in...

Jul2614 06:33 AM
HallsofIvy

4 
542 
after it was found out that the first 9 pi digits 141592653 result in the end sum of 9, i searched for its iteration...

Jul2514 10:19 PM
9I.

2 
272 
If I have the following transfer function:
x = A1 + A2*y + A3*sin(A4*y + A5) + A6*sin(A7*y + A8) +A9*sin(A10*y +...

Jul2514 04:15 PM
SteamKing

1 
158 
I was wondering how that could be done.
I...

Jul2514 10:01 AM
gmax137

3 
474 
Hey guys,
Struggling with understanding this taylor vs. maclaurin series stuff.
So a few questions. Let's say...

Jul2514 02:34 AM
Simon Bridge

3 
285 
Hey,
I've begun going through a book called "An introduction to geophysical exploration" by Phillip Kearey and...

Jul2414 10:51 PM
AlecYates

5 
220 
from wiki:
Suppose we have a hemisphere of radius 10 r10 (a) and cut it in ten horizontal slices (1 is on the...

Jul2414 09:16 AM
bobie

9 
305 
I'm currently reading Tolstov's Fourier series and in page 58 he talks about a criterion for the completeness of a...

Jul2414 09:06 AM
Chacabucogod

0 
158 
Is this statement true?
\bf{Re}\{z_1 \times z_2\} = 0 \,\, and \,\, z_2 \ne 0 \Rightarrow z_1 = 0 \,\,\, where...

Jul2414 02:56 AM
Mentallic

18 
600 
Hello
This is question is bugging me for years.
Why is division by 0 undefined and not multiplication by 0...

Jul2314 09:02 PM
1MileCrash

7 
427 
What is the difference between these two concepts? Can they be used interchangeably to solve optimization problems? Is...

Jul2314 02:13 PM
Maylis

0 
201 
Are there any complex solutions to cos x = 2?

Jul2214 08:15 PM
johann1301

3 
536 
Obviously it will take some bruteforce. But how do I minimize the bruteforce needed (optimize)? I know one can solve...

Jul2214 04:41 PM
jedishrfu

1 
461 
A function f(x) where f(x)=length of the graph curve/line from 0 to x
Can this function be expressed in algebraic...

Jul2214 11:08 AM
MrAnchovy

8 
663 
So it was my observation that all the prime numbers I saw ended with digits 1,3,7,9.Is this true for all primes? Is it...

Jul2214 09:21 AM
micromass

8 
381 
Why are perfect numbers important?
What is the best way of introducing these numbers to a first course on number...

Jul2214 03:55 AM
micromass

2 
488 
Hi!
I posted a new thread about a week ago, but so far no one was able to help me:
...

Jul2114 02:21 PM
Tusike

0 
377 
consider a sin wave
to find the average of this function over interval 2pi, why not just do...
...

Jul2114 01:49 PM
George Jones

4 
565 
reliability means the probability of device that device will perform for given time interval under given condition
or...

Jul2114 10:06 AM
vead

0 
377 
Our company is holding a weight loss contest consisting of 5 people teams. If one of the people weigh in but cant...

Jul2114 03:08 AM
20GT

22 
1,589 
Hello,
What is an affine function? My professor has been throwing around this term in the lecture videos and I have...

Jul1914 11:42 PM
SteamKing

1 
686 
Guys,
I have a problem I'm trying to solve for work (we're trying to inspect a hole, and I'm trying to determine...

Jul1814 01:48 PM
bahamagreen

4 
832 
Hi everyone! I am looking for an equation for a projectile which takes into account air resistance. I preferably want...

Jul1814 12:47 PM
mfb

1 
557 
I always thought the derivatives (or generally any operation with infinitesimal (infinitely large) values) belongs to...

Jul1814 11:44 AM
micromass

27 
2,065 
Suppose I have three statements of congruence:
x = a mod n, y = b mod m, z = c mod p;
Furthermore, x is a given...

Jul1814 08:38 AM
1MileCrash

2 
687 
I was doing some basic analysis of the Dedekind eta function and some Dirichlet series and the following equality just...

Jul1814 07:50 AM
Simon Bridge

1 
842 
I am puzzled by the following example of the application of binomial expansion from Bostock and Chandler's book Pure...

Jul1814 12:17 AM
Simon Bridge

7 
2,916 
Let's say I wanted to do the following calculation: (x^2 + 2x + 1) / (x+1)
I've scrolled through some online...

Jul1714 03:02 PM
symbolipoint

14 
1,383 