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Sep
24
awarded  Critic
Sep
23
accepted Conservation Laws and Symmetries
Sep
23
revised What happens when we cut objects?
deleted 2 characters in body
Sep
22
asked What happens when we cut objects?
Sep
22
asked Conservation Laws and Symmetries
Jul
30
accepted Why and how is sound produced when two objects hit each other?
Jul
16
comment Why and how is sound produced when two objects hit each other?
Thanks for the answer. So, when two stones hit each other and they are in my hands, each one make the other vibrate by means of the impulse given and this vibration is trasmitted to the surrounding air to produce an audible wave pressure? I mean, can I neglect the detailed "solid" effects and just consider every collision as a source of vibration of the objects (even if the vibration is partially suppressed as in the case of my hands on the stones) ?
Jul
14
comment Glass - paper: Stevin's Law
Yes, I figured this. So, now I am wondering if the effect I described in the question is the main responsible of the non-fall of the paper, or if the surface tension (for small radius of the glass) is much more important as some people say explaining this experiment, and as confirmed by the fail with a bigger surface. In fact, with a bigger surface, the pressure effect should be the same (actually even better because of the less importance of border effects) but the surface tension becomes irrelevant.
Jul
14
comment Does Newtonian mechanics predict the bending of the course of light by objects with mass?
@Peter I don't understand why a particle without mass, in Newton theory where the interaction is supposed to be proportional to both the masses of the particles considered, should feel a gravitational field. Could you pleas clarify this point?
Jul
14
comment Glass - paper: Stevin's Law
Can I also ask you how much does the surface tension matters? Actually, I expect that with a big tank this same experiment doesn't work. Is that true?
Jul
14
revised Why and how is sound produced when two objects hit each other?
added 359 characters in body
Jul
14
comment Why and how is sound produced when two objects hit each other?
So, some collisions are louder than others just because they cause a bigger local variation of pressure (which then propagates through air until finally gets heard). Right? So, why some objects, even if the velocity before and after the collision seems to be the same, are louder than others? I mean, how do the different material properties enter in the phenomenon?
Jul
14
revised Why and how is sound produced when two objects hit each other?
added 56 characters in body
Jul
14
asked Why and how is sound produced when two objects hit each other?
Jul
12
awarded  Suffrage
Jul
12
accepted Glass - paper: Stevin's Law
Jul
12
revised Flow of liquid among branches
tag added
Jul
12
suggested approved edit on Flow of liquid among branches
Jul
11
revised Time reversal symmetry and T^2 = -1
added a tag
Jul
11
revised Bohmian Quantum Mechanics diffusion
added 1 characters in body