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  • 41 votes cast
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
Dec
20
awarded  Popular Question
Aug
27
comment Are orbiting planets an example of perpetual motion?
@LuboŇ°Motl, but the planets are accelerated all the time, aren't they?
Jun
28
awarded  Popular Question
Jun
13
awarded  Notable Question
Jun
4
comment Total current of two sources in series?
@dmckee, as far as Kirchhoff's theory goes, I agree to Will's answer. But maybe you can demonstrate application you had in mind?
Jun
4
comment Total current of two sources in series?
Yes, that's about as much as I can get out from those equations myself.
Jun
4
comment Total current of two sources in series?
@Will that is all the information he supplied.
Jun
4
asked Total current of two sources in series?
May
22
comment What is the effect of humidity in temperature?
@user61001, yes, apparent one. If humidity is higher, it seems hotter to people compared to medium or low humidity.
May
19
comment What is the effect of humidity in temperature?
"Tashkent" is synonymous for "very hot". What's with the outside? I don't really understand the new question.
May
19
comment can be exist the negative mass?
Physics become interesting when you consider exotic and scifi-like things. Even Newton's second law becomes funny if you consider negative masses :)