Recent content by alejandrito29

Homework Statement Evaluate the electric field of a hollow sphere with a dipolo , in a dialectric. See left figure.. Homework Equations $$\alpha \vec{p}$$ The Attempt at a Solution I don't understad why at the field electric "in" there is a term of form $$\alpha \vec{p}$$ , and term $$\beta$$...

Tanks Some suggest for solving my problem? my adittion out of radius $$r_0$$ is because there is two field electrics at zone $$r>|r_0|$$, then two potential . I don't am sure of this. Help please

Homework Statement Capacitor parallel plates separation $$d$$, potencial diference $$V_0$$, at the center there is a semi sphere of radius $r_0$. Find the potencial as function of position if $$d>>r_0$$ Homework Equations I think that relevant equation are Gauss Law The Attempt at a...

Thanks. Other Question: There is a places of the world, where, the phd is only a thesis?, without asignatures Thinking in a phd whit only thesis and permanence of short times

some suggest for my case?

In my opinion, the boock Zettili Quantum Mechanics: Concepts and Applications, 2nd Edition is a bock that start from basic concept mathematics and physics, is ideal for some man that do not a complete physics formation..

I don't know the university, since, in Bolivia there is not Phd in physics, and i do not want get out again of my country. Topics that would be: gravitation, extra dimensions, extensions of general relativity, etc...

There is a place where i could to study a phd physics, where do not exist the need of stay physical at the place?I have 32 years old, i live in Bolivia, i have a master of physics (i studied out of Bolivia) , and one publication on physical review D. By reasons family, i do not want get out...

the problem says: "consider a particle with orbit ##r(\phi)=\frac{r_0}{1-\epsilon \cos (\beta \phi)}## ##\epsilon \in ]0,1[## and ##\beta=cte## a) Find the precession angle. b) What is the condition to the trayectory is totally cyclic?? __________________ I don't understand why i calculare...

I am reading about the Asimov pendulum (see figure) The aceleration in spherical coordinates is ##\vec{a} =( R \dot{\theta}^2 - R \omega^2 \sin ^2 \theta) \hat{r} + (R \ddot{\theta} - R \omega ^2 \sin \theta \cos \theta ) \hat{\theta} + (2R \dot{\theta} \omega \cos \theta) \hat{\phi}## The...

Is correct the following procediment? ## A \sin (\omega t) = A \sin (\phi) \to \phi= \sin^{-1} \sin (\omega t )## Is correct to say that ## \phi = \omega t## is oscillatory in this case ??

sss this is my graph, but, at the lagrangian the solution is ##\theta=\omega t## but, my teacher says that the solution must be ##\theta## oscillatory. I Says that the length of the proyection cycloid is oscillatory ## ds/d\theta = \sqrt{(dx/d\theta)^2+(dy/d\theta)^2}## but, the x...

the coordinates of cycloide are ##x= a (\theta- sin \theta)## ##y= a(cos \theta -1)## If i use ##\theta =\omega t## this is a example of cycloid but, if i use ##\theta=\cos (\omega t)##, ¿this is a cycloid? My teacher says that in a cycloid pendulum ##\theta## must be oscillatory...

I have read the follow bock...

look this...