3,002 reputation
11340
bio website cedrich.net
location Geneva, Switzerland
age 28
visits member for 4 years
seen Oct 28 at 0:16

Nov
8
comment Is electricity instantaneous?
"I've simply been told before that itsa flow of electrons, but this seems to basic and does show that electricity is instant." Why would this mean that electricity is "instantaneous" ?
Nov
8
comment Home experiments to derive the speed of light?
Works with cheese too :p
Nov
7
comment Period of Precession
No worries.
Nov
7
comment Period of Precession
We both got a +1 and a -1, I can understand mine, but why -1 here ?
Nov
7
comment Period of Precession
You're right, sorry. I first tried to answer explaining frequency, period and angular frequency, but my explanation was not clear at all.
Nov
7
comment Angular Momentum and Force
OK thanks for this clarification ! So centripetal and centrifugal.
Nov
7
comment Period of Precession
Quick advice: add units when you write numbers !
Nov
7
comment Angular Momentum and Force
Question in English: what is the name of a radial force acting toward the center ? What is the name of the pseudo-force introduced in the rotating frame of reference ? Because you said "to counteract the centripetal force" ... I would say that the force we are talking about is the centripetal force... (in French we make a distinction "centripeDe" and "centripeTe").
Nov
7
comment Angular Momentum and Average Torque
Yes. How did you obtain the answer of question 5 ? Is that "rotation speed squared" times "TOTAL angular momentum" times 0.5 ?
Nov
7
comment Angular Momentum and Average Torque
The answer to question 4 should be "automatic": by conservation of angular momentum this has to be the same as answer 1. To answer "my question 2" you just multiply the rotational speed by the momentum of inertia of the rod (not the total one).
Nov
7
comment Angular Momentum and Average Torque
The answer to point 1 is the answer of (3). Then how can you calculate the angular momentum, with the rotational speed given ?
Nov
7
comment Why can't the outcome of a QM measurement be calculated a-priori?
About your last paragraph: I don't see the link between "since [...] this wavefunction can be expanded on its eigenstates".
Nov
7
comment Angular Momentum and Average Torque
As we are in beta, I would like to know if you guys think it is a good way to answer homework question (hope I did not make any mistake in the answer itself).
Nov
6
comment Why did people expect the number of electrons emitted because of the photoelectric effect to rise with the radiation's intensity?
Could have been a good seeding question :p
Nov
6
comment How does Positronium exist?
+1 for quoting Phys. Rev
Nov
6
comment Is energy really conserved?
Or for example, that's the creation of virtual particle as mediators that explain the interactions between particles.
Nov
6
comment Is energy really conserved?
@Casebash: OK I should really check in a dictionary before answering.
Nov
6
comment Why don't spinning tops fall over?
@Mark: that's my point...
Nov
5
comment Why don't spinning tops fall over?
Ok I didn't know that was a French-only name.
Nov
5
comment How are forces “mediated”?
I change the "electromagnetism" tag to "electro-magnetism" as more people have been using it.