Recent content by *best&sweetest*

If you are interested in the question, the entire question is quoted in Doc Al's post, and I managed to understand it by myself, so there is no need for other people to waste their time on it...that's why I deleted it.

[SOLVED] spring-coupled masses Thanks, Doc Al... I think I understand it now!

you should be able to define two nonzero continuous functions whose product is zero function...

I'm working on the similar problem right now, and I was going through many threads in this forum and couldn't find the answer whether the product as Chen defined it is an ideal. I wanted to find the counterexample that {x*y | x in I1, y in I2} is an ideal, but was not able to come up with...

I got it. Thank you very much. I knew about the voltage, but I forgot to consider charge conservation. Thanks!

Homework Statement If the switch is flipped from position A to position B, what's the charge on capacitor C1 and C2? Please see the attachment below Homework Equations Q=CV The Attempt at a Solution I know that the capacitor C1 gains potential difference of 200V (=...

I need to construct a direction field plot for a differential equation and I have this code Needs["Graphics`PlotField`"]; PlotDirectionField[ff_, {x_, a_, b_}, {y_, c_, d_}] := Module[{f}, f = \ Compile[{x, y}, ff]; PlotVectorField[{190, f[x, y]}, {x, a, b}, {y, c, d}, ScaleFunction -> (1...

Thanks Dick, I hope you're right.

OK, thank you, but if it was fun waiting I wouldn't have asked the question at all.

force from gravity is weight and it acts all the time not only as it slides down... use Newton's II Law, and, yes there are only 2 forces

1) is it a plane? - plane is supposed to be infinite, right? try to find expression for electric field on the surface of conductor using Gauss's law

You do NOT need to calculate any angles. Everything you need is there. Are you familiar with Coulomb's law and vector addition? You should know that electrons will attract proton with forces along the lines that connect them - therefore you know the angles.

would you please check my answers?-Gauss's Law Homework Statement I've just had an exam and this was one of the questions. There is point charge Q1 = -6C in the center of conducting shell. The total amount of charge on the shell is 4C. Then, outside the shell there is point charge Q2=-8C and...

I have just bought student edition of Mathematica and I have no idea how to so some basic stuff. Could anybody please tell me how to "sketch several typical solutions of the given differential equation and highlight the one that satisfies the initial condition" using Mathematica? I have tried...

Could anybody please explain the concept of extended plane and extended space? I know the definition of an ideal point and that's the only part that I really understand. If each two distinct planes (in extended space) meet in just one line, does it mean that there's only one ideal line for each...