Recent content by Ele38

Thank you, I did not think about concavity. What is "obscure" to me is what doest "circle that best fits the curve at a point" means in math language...

Maybe you should post the print screen of the graph, in order to help us to recognize the type of function. Anyway, I think that Excel has a function to fit your data with a function, if there is the software automatically tells you the coefficents ;) A software that does that is LoggerPro, and...

Hi guys! I learned yesterday what an osculating circle is and I am learning how to find the radius of curvature of some curves. For example I have found that for y=x^2 the radius of the osculating circle for the point [0,0] is 0.5 (That's why circular mirror works similarly to parabolic mirror...

I took the SAT last December, if you want an advice, do not bring with you any graphical calculator: I lost a lot of time using mine.

I have a Kindle 3 and it works well, for me, even though the screen is not very large and I have to switch to landscape orientation. I am waiting for this, it should be released in june http://www.noteslate.com/

Maybe also a system with a gyroscope and an accelerometer would work fine.

Maybe they are just pull-down resistors. It's purpose is to force a zero (low) value when no other component is driving the input (no load) by providing a current limited path to negative power source through the resistor, while allowing the voltage to swing high if a load is present. (from...

Serial port works with signal from +-3V to +-12 (or a little more). The MAX232(which is useful to connect a logic TTL circuit to a RS232 line) chip uses capacitor to make +-12 from 5V, for example. It depends on your adaptor.

Thank you all, especially uart, I will try with the geometric argument, if I have problem I'll post them here ;)

Mybe I explained in a wrong way what I wanted (sorry but I study physics no more and my english is not as googd as it should be ;) ) I would like to prove this http://en.wikipedia.org/wiki/Small-angle_approximation I read that I can prove the small angle aproximation with Taylor series. sin(x) =...

Hello to everyone. Here is my question. How can I found that when x approaches 0, sin(x) approaches x ? A person told me that I have to use Archimede's axioms number 27 and 28. Do someone has a demonstrationor can help me?

Interesting discussion :) My opinion is that HP is better. I used a TI89 for a physics project and it was good, but the 50g is more powerful, I think! As I said this is an interesting discussion, but also weird. High school students with these powerful calculators? I'm a student, in the last...

Maybe 100 can also be the maximum applied voltage of the capacitor. 102 I agree with you, 10*10^2 nF.

I think that it is also important to have a lot of TTL chips, such as logic gates, FFs, etc ... Too many people want to use microprocessor but do not know what a logic gate is :cry:

The Fourier transform requires a continuous function as the input and its output is another continuous function (so the spectrum of the signal is NOT discrete). Unlike Fourier transform, Fourier serie gives a discrete spectrum, not a continuous one. Maybebecause there is DFT, Discrete Fourier...