The combination of potassium nitrate and sorbitol and commonly used by hobbyists as a propellant for rocket motors.
The combustion equation is given below:
I have a few very simple questions based on the chemistry of such a reaction.
Firstly, many people do not use stoichiometric...
Awesome, thanks a lot for the replies! Using your myspeedybob as a guide, I found this:
http://www.tpub.com/content/et/14086/css/14086_34.htm
It explains pretty much exactly what you said. So I guess as a general rule, assume the resistance of the body is R = 1500 Ω. Then, find the current...
Hey guys,
My understanding of circuit analysis and the like is very minimal, and I have had a certain lack of understanding about something for a long time, and I feel I need to get a solid answer.
I understand the fundamental difference between a voltage or potential difference and a...
Hey everyone!
I was recently scribbling on paper, and after a series of ideas, I got stuck with a problem. That is, can I find out if there exists some integers A and B such that
C=2^{A}3^{B}
For some integer C?
For an arbitrary C, how do I know whether some A, B \in \textbf{Z}...
Hey all,
I recently encountered a problem that I cannot seem to solve...
Let's say I have the following coins A, B, C, D and E, each one with an associated integer value such that:
A = 1
B = 2
C = 3
D = 4
E = 5
Let's say I can pick N of them, and order does matter (so ABC is not...
Hello all,
Given two 3D lines described by the general equation
\vec{L(t)}=\vec{p}+\vec{d}t
I found a way to find their intersection point, but it uses the cross product in the derivation. I am assuming a 4D line is a valid thing? And can be described the same way? (except with 4 element...
I recently encountered another problem, but it extends this topic. Instead of opening a new thread I guess this place is as good as any..
If one defines the function E=|1-x-y| + |4-2x-y| ... how can I find it's minimum now (x and y coordinates)? Can this be extended to N variables inside each...
Hmm... you can still get x'(t) and y'(t) by differentiating implicitly t(x) and t(y), but you will be left with derivatives still partially in terms of x and y...
Edit: I am not sure if this is valid, but as you are evaluating the final derivative at t=0, why not do it to all the partial...
If you have done this, then try the chain rule (http://en.wikipedia.org/wiki/Chain_rule) but use partial derivatives.
if you have x(t) and y(t) then \frac{df}{dt} can be found by
\frac{df}{dt}=\frac{\partial f}{\partial x}\frac{\partial x}{\partial t} + \frac{\partial f}{\partial...