Recent content by Behrooz

thanks for the book:origin of fields: ill be grateful if u itroduce me such books in every field of physics and math

so you mean that charge was firs defined by force,when we have to equal,unit charges we will have a special force

hello,every one Could anyone tell me the historical order of the demodulation of these quantities? My question is how could it the el. charge been defined(ocording to the el. current?but how?were they able to measure el. currrent in that time?) thanks, PS,could u please introduce me some...

well,to know exacly how he came to this formula(and surely many other equations and quantities) u have to read the original textbooks written by the past scientist if available, to get a half of what u want,the problem of today science is that no One knows how much effort is taken to get these...

[b]hi,could u please help me with this Geometrical problem? in this figure prove that : d||d'[b] Heres the figure: as u see A=90 and so is A'

No No , its just an example! (i found the answer)

I know the answer but not the proof you r all right,friends! but i don't know how to start i have drawn the shapes and i already know the answer i am thinking about the proof. thanks everyone!

hi,evryone! whats the result of connecting the middle of every sides of each common tetrahedron? (please give proofs,actualy the proof is much more important than the answer) 1.squer: 2.rhornbus: 3.parallelogram: . . . (im sorry if there's in mistake in my...

Help Me By Your pieces of Advise! HI, CAN anybody suggest me a method of solving math and geometry problems?or the way of thinking on a problem(i don't really know how to start!).at list please tell m some pieces of advise based on your own experiements. thanks!

but when the valum changes,the pressure will change.

hi, why is the presure in liquids not dependent to the shape of its container?

your question has no answer! i have asked this before u and i found no good answwer. all we no is:energy is a quantity that can not be seen and has no mass. when an object has energy it either can do work or has heat(which is a kind of energy) but what is the reason for which an object has...

hi,everyone,could u please tell me the exact definition of energy?