Recent content by dido28

yes it's done i get the result . thanks for your help WannabeNewton

oh yes sorry it's R2-2z2 :shy:

yes that's it

well me i found : dE/dz=qk[ (z2+R2)3/2-3z2(z2+R2)-1/2 ]/(z2+R2)3 i just applied the rule that i know but in the book it seems that they did some simplification so my question is how they did this

hi every one on an exercise on book we ask us to find the electrical field for a uniformly charged ring where we going to find : E=kqz/(z2+R2)3/2 then we have to derivate it wth respect to z and we find : dE/dz=kq*(R2+2z2)/(z2+R2)5/2 so my question is how do we get this derivation ?

the professor asked us that question and we told him the same think so he gave us that problematic : he asked us about the state of protons and neutrons in the nucleus , we told him that they are in equilebrium, and he said but they are always in vibration and he let us like that

is it true that all matter and everything in this universe microscopic or macroscopic have a tendency to go to an equilibrium state ?

thanks everyone that really helped me

can you explain me please the difference between the special and general relativity i did some research and only what i found and what i understand and i ' m not sure is that te SR is applied only in inertial frame and the GR is applied in the noninertial frame correct me please if i ' m...

i read on a book that the matter can be classified as crystalline substances , amorphous substances or both of them depending on the % of packed crystalline part . please can you explain me what does it mean

tanks evryone

believe me i will :approve: but for the rest any suggestions

that is what i said to the professor but he insist and told me that there is a difference :confused:

hi everyone I'm in my first year of electronic engineering and i have some questions which the professor of physics gave us but more as research than homeworks and to be honest i really tried but i didn't found anythings so I'm here to asking for your help 1- what is the difference between: (A...