Recent content by SothSogi

Hi there. I was wondering if there are classical theories for the weak and strong interactions. I am relatively new to physics so I do not know the answer. Also, is there any classical theory for the electroweak interaction? Thanks in advance.

Ok, thank you very much to all! There are some things you mention that I honestly do not know, like for instance the delta functions. But it is now clear where my mistakes were and how to derive it using other methods. Thank you.

Hi there. I am trying to derive Gauss's law from the divergence. I would like to know if it is correct: The divergence is defined as (I saw this on Fuller & Byron "Mathematics of classical and quantum physics") ##...

Thank you very much! I noticed the "Homework helper-Gold Member-2017 award" title you have! OMG, I didn't know who was helping me :) With respect to the units, I learned doing that saves you a lot of time, and some of my classmates do not have that habit, but I consider it simply crucial. And...

Thank you very much for your help. I always get depressed with these problems hehe. I guess practice makes perfect. So the time it takes to go up and down is ## t=\frac{2v_{cm,0}}{g} ##. With this, one can write ## d*F\Delta t=I\frac{2\pi}{dt}=I\frac{2g\pi }{2v_{cm,0}} ##, then, with the linear...

Thanks for your help. The CM goes up (due to the impulse), then down (due to gravity), during that time interval. I guess I have to calculate this time interval using the kinematic equations (I also wanted to include torque due to gravity, but I admit I simply do not know how to do that)...

Since it is the angular velocity, and I wrote ## 2\pi##, it should be the time it takes to complete exactly one rotation. But you are right, I am still confused about that. (That is why I got stuck with this problem, I still do not understand rotational dynamics very well, although I have solved...

That would be ## v_{cm}=\frac{dx_{cm}}{dt} ##. I can substitute this on my "result", then the result does not depend on the impulse, but now I have the ## dx_{cm}##. Thanks for your guide, sir.

Yes. d is the distance from the center of the stick to the point where the impulse was applied. Also, dt comes from dtheta/dt. Since the constrain of 1 rotation makes dtheta=2*pi, I supposed I needed dt. To find the velocity of the CM after the impulse was delivered I can use F*Delta t=m*v_cm...

Homework Statement (Sorry for not typing like Latex, I still do not know how) One has a uniform stick of length l which is held horizontally. At t=0 it is released from rest. At the same time, a sharp upward blow by a force of magnitude F perpendicular to the stick is applied at a distance d...

I know they are going to close this topic for what I am going to say, but, Orodruin, you have got to be kidding me if you do not answer the question but rather want me to be specific. Anyway, by they I mean the authors of the books, Kleppner, Dourmashkin, Young and Freedman, Thomas Moore, was...

Hi everyone. So I was studying and they say there is a force function (and a potential energy, I suppose) for every fundamental interaction. So, they always show the gravitational and electromagnetic force/potential energy functions for these, and they always mention the other two (plus the...

Yes, I suppose. But here I am talking about well known singularities, like black holes, or that thing, renormalization which I do not know very well. I think there is another called cosmic string, or another called domain wall.

Thanks Buzz Bloom. That is exactly the kind of information I am looking for. Thank you very much :smile:

Hi there everyone :smile: I'd like to have a list of all the instances where a singularity appears in physics, e.g., in relativity, causing the black hole thing. Specific cases where \frac{x}{0} appears. For instance, I heard that there is another case in quantum mechanics, or quantum...