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1d
asked Ricci tensor of the orthogonal space
2d
awarded  Citizen Patrol
May
22
comment Einstein Field Equations in other space-time dimensions than 3+1?
Thank you very much for your comments and answer.
May
22
accepted Einstein Field Equations in other space-time dimensions than 3+1?
May
22
comment Einstein Field Equations in other space-time dimensions than 3+1?
Thank you very much for the very informative answer.
May
22
asked Einstein Field Equations in other space-time dimensions than 3+1?
May
16
comment Is it possible to whirl a point mass (attacted to a string) around in a horizontal circular motion *above* my hand?
@OSE Indeed. Well, it answers the fact that in vacuum, with just gravity and angular velocity there's no way a body's movement can be the one from the second picture. It can't even go horizontal, since, even if the angular velocity goes to infinity (maybe the string is made of carbon nanotubes), there's nothing that cancels the vertical gravitational force...
May
16
answered Is it possible to whirl a point mass (attacted to a string) around in a horizontal circular motion *above* my hand?
May
6
comment Why does a supernova explode
I believe the explanation comes from the creation of a shockwave originated by the collapse of the outer layers into the massive core.
Apr
22
comment Theoretical need for Newtonian Gravity
@Qmechanic Google always led me to the Parameterized post-Newtonian formalism and I wasn't aware of the post-Newtonian expansion. Thank you for the indication.
Apr
22
accepted Theoretical need for Newtonian Gravity
Apr
22
comment Theoretical need for Newtonian Gravity
Yes it was this what I was looking for. Thank you very much.
Apr
21
comment Theoretical need for Newtonian Gravity
I had seen the wiki article about MOND before I made the question. Although it's an interesting theory I was looking for something where the Poisson equation were not changed. I mean, some framework or regime where Newton gravity would have applicability. Thank you though.
Apr
21
asked Theoretical need for Newtonian Gravity
Apr
4
comment Why is momentum conserved (or rather what makes an object carry on moving infinitely)?
@marksyzm This is a really interesting topic that is used thoroughly not only in Classical Physics but also in more advanced topics such as Quantum Mechanics, Standard Model, etc. Symmetries is the way to go so read and ask as much as you see fit. =)
Apr
4
revised Why is momentum conserved (or rather what makes an object carry on moving infinitely)?
edited body
Apr
4
answered Why is momentum conserved (or rather what makes an object carry on moving infinitely)?
Mar
26
awarded  Critic
Mar
26
awarded  Informed
Mar
17
comment A very elementary question regarding force of friction
@dmckee Now this is a great example of what comes from not reading the answer carefully. Yes you're completely right.Thank you