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Apr
10
accepted Could a tetraquark $q \bar{q} q \bar{q}$ be colorless?
Apr
9
revised Could a tetraquark $q \bar{q} q \bar{q}$ be colorless?
edited title
Apr
9
comment Could a tetraquark $q \bar{q} q \bar{q}$ be colorless?
@innisfree That was my doubt, yes. But you answered it in you first comment.
Apr
9
comment Could a tetraquark $q \bar{q} q \bar{q}$ be colorless?
But then it can't be color neutral if it's composed by $c \bar{c}d \bar{u}$. I thought all hadrons had to be neutral.
Apr
9
asked Could a tetraquark $q \bar{q} q \bar{q}$ be colorless?
Apr
9
comment Why doesn't our body gets crushed due to the atmospheric pressure?
@EnosOye It was a cartoon plus the sphere was made of a very weak material. =p
Apr
9
comment Why doesn't our body gets crushed due to the atmospheric pressure?
Once I saw a cartoon where the main character thought that taking the air out of a sphere would make it float. The sphere collapsed.
Jan
30
awarded  Enthusiast
Jan
29
revised Matter density measured by an observer
added 14 characters in body
Jan
8
comment Mechanics Landau Galilean Principle
When I was first reading Landau and Lifshitz first volume I also used John Taylor's Classical Mechanics such that when I couldn't quite understand the full meaning behind Landau's words I just checked Taylor's book. Btw, Taylor's book is a very good book and I actually found it better at certain chapter's than Landau's to learn on a specific subject (for example rotational motion of rigid bodies).
Dec
18
comment Event horizons in Newtonian mechanics and Galilean relativity
@Qmechanic When I said classical physics I was thinking in the sense that the theory obeys the Galilean relativity. I was, then, asking what premisses would prevent the existence of an event horizon: the imposition that all inertial frames share a universal time, or that there exists an absolute space, the euclidean space?
Dec
18
asked Event horizons in Newtonian mechanics and Galilean relativity
Oct
25
comment Ignore terms in the equation of motion
@Adam Thank you, Adam, that solves my doubt.
Oct
24
comment Ignore terms in the equation of motion
@ComptonScattering My mistake. I don't know what I was thinking. Maybe I copy pasted something wrongly. Either way, just edited the question. Thank you.
Oct
24
revised Ignore terms in the equation of motion
edited body
Oct
24
asked Ignore terms in the equation of motion
Oct
21
asked Perihelion Advance in curve space
Oct
20
accepted Two formulas for a particle's acceleration
Oct
20
comment Two formulas for a particle's acceleration
I get it now. Thank you very much for your answer and patience.
Oct
19
comment Two formulas for a particle's acceleration
I'm feeling stupid. If I write the metric of $\mathbb{R}^2$ in polar coordinates as: $ds^2=dr^2 +r^2 d\theta ^2$ I find the same expression for $a^r$ as you, using Eq.$(3)$. But using Eq.$(2)$ isn't it the same as, for example, what I did in this answer?