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seen Jul 15 at 4:56

Jul
2
awarded  Curious
Jun
17
awarded  Notable Question
May
7
revised Why not shoot a marble sized spacecraft at the moon?
added 114 characters in body
May
7
revised Can we divide two vectors?
deleted 12 characters in body
May
7
comment Can we divide two vectors?
@JerrySchirmer oops, right. You can only determine the component that's normal to $\vec{B}$. Thanks!
May
7
comment Can we divide two vectors?
I see nothing wrong with your answer.
May
7
answered Can we divide two vectors?
May
6
revised Why not shoot a marble sized spacecraft at the moon?
added 309 characters in body
May
6
comment Why not shoot a marble sized spacecraft at the moon?
@Draksis Thanks, I will clarify it. While inertia is not a true force it is sometimes (fluid dynamics useful to refer to it as a force. For example Navier-Stokes equation can be seen as balance of inertial force and pressure, viscuous and other body forces.
May
6
comment Why not shoot a marble sized spacecraft at the moon?
@Draksis The volume decreases faster than area so surface forces get relatively bigger compared to volume forces like gravity and inertia.
May
5
answered Why not shoot a marble sized spacecraft at the moon?
Apr
24
comment Was the mass of the universe the same when it first began as it is now?
Mass could be understood as the rest mass of all the matter which can change from day to day. I bet you meant the total energy (including mass)...?
Apr
23
accepted How does conservation work in wormholes?
Apr
23
asked How does cosmic horizon work?
Apr
23
comment How does conservation work in wormholes?
"spacetime curvature involved in a wormhole is qualitatively no different to the spacetime curvature around, for example, the Sun" So there is actually no way to distinguish where is the inside and where is the "normal" spacetime? And I could exchange energies and momenta with that matter at any time during the travel while only conserving the totals, right?
Apr
23
asked How does conservation work in wormholes?
Apr
22
comment Mass or no mass?
I believe this is the canonical article: arxiv.org/ftp/cond-mat/papers/0509/0509330.pdf It seems unlikely that this speed will be irrelevant of frame...
Apr
22
comment Mass or no mass?
"Some systems have $m=0$, and these systems always have momentum relative to your inertial frame. Indeed, you will always observe their relative velocity to be precisely $c$." Is it true about the massless electrons of graphene?
Feb
9
awarded  Nice Question
Feb
8
awarded  Yearling