There's this problem that I've been trying to solve. I know the solution for it now but my initial attempt at a solution was wrong and I can't seem to figure out the mistake with my reasoning. I'd appreciate some help with figuring this one out.
1. Homework Statement
I have a set of random...
Oh! I get it now. I was confused by the two layers of pointers. The initial statement allocates memory for the array of pointers and since the array needs to hold pointers each element needs to have enough memory to store pointers of type (int *).
Thanks!
Homework Statement
Ok, I'm learning C programming and I'm trying to create a dynamic 2D array. This is the code that seems to work in creating a dyamic array. I found it in a book.
//rows and cols are values entered by the user when the program runs.
int **(matA) =...
Homework Statement
A sequence \{s_n\} is defined by s_{n+1} = \frac{1}{2} (s_n + s_{n-1}); s_1 > s_2 > 0 I have to prove that the sequence is convergent and I have to find the limit.
Homework Equations
The Attempt at a Solution
I tried equating the limit of both sides to get s =...
I think I understand. So there is a small force. That's the reason one of the possible theories for the end of the universe is that the expansion of space overcomes the force of gravity and electromagnetism cause atoms to rip apart.
I think they call it "The Big Rip". They're quite fond of...
Homework Statement
I trying to learn general relativity and ran into a few questions while learning about the expansion of the universe.
I found a really good intuitive explanation of the expansion of the universe here: http://curious.astro.cornell.edu/question.php?number=274
However...
Square both sides and bring the bottom part to the other side. You'll get
y^2 = (1+y^2)(x^3 + c)^2
Then multiply out and regroup.
y^2 -y^2(x^3 + c)^2 = (x^3 + c)^2
then you'll get y^2 = \frac{(x^3+c)^2}{1-(x^3+c)^2}
So y = \sqrt{\frac{(x^3+c)^2}{1-(x^3+c)^2}}
Ah! I think I get it!
I've been considering the cartesian equation instead of the vector equation!
So y^1 = \frac{\sqrt{3}}{2} x^1 + \frac{1}{2} x^2 !
Then I can get \frac{∂y^1}{∂x^1} = \frac{\sqrt{3}}{2} and \frac{∂y^1}{∂x^2} = \frac{1}{2}
Yes, I get it now. Thanks a lot for...
Oh! I'm really sorry! :frown: It should have been
dy^1 =\frac{ \sqrt{3}}{2} dx^1 + \frac{1}{2} dx^2
And that book is really good. Thanks!:biggrin:
About trying to write the equation in that format I think the problem maybe that I'm not writing it down correctly.
In my coordinate...
Homework Statement
This is me doing some independent study on Tensors because I eventually hope to understand General Relativity.
My question is about the following equation which describe hoe the components of a displacement vector transform when there is a change in the coordinate system...
Homework Statement
Log-ons to a certain computer website occur randomly at a uniform average rate of 2.4 per minute. State the distribution of the number N of log-ons that occur during a period of t minutes.
Obtain the probablity that at least one log on occurs during a period of [I]t...
I say this because the standard electrode potential for the above reaction is more positive than the standard electrode potentials for the reactions in neutral conditions.
I got the question from an A-Level Chemistry textbook in a chapter on electrochemistry.
The question may be referring to the specific reaction and why the presence of an acid improves the the oxidizing capabilities of permanganate ions.
Does it act like a catalyst?
Homework Statement
MnO_4^{-} + 8H^{+} + 5e^{-} \rightleftharpoons Mn^{2+} + 4H_2O
1. Explain why the presence of an acid is necessary for aqueous permanganate ions to function as an oxidizing agent.
2. Give two reasons for the aqueous permanganate ions acting as an oxidizing agent in acidic...