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  • 4 votes cast
Apr
27
awarded  Good Question
Mar
13
comment Why does matter exist in 3 states (liquids, solid, gas)?
@craq: It's worth pointing out that as far as we know, Bose-Einstein condensates exist only on Earth. Take that, universe!
Nov
3
comment What is the smallest item for which gravity has been recorded or observed?
@Floris: One can use Newton's Laws to predict that each of these neutrons exerted a gravitational force on the Earth, but the question ask for an observation.
Nov
1
comment Are there any exact data about Earth's orbit?
Maybe I'm being fussy, but to me the words accurate, precise and exact mean three different things...
Oct
2
comment Why is light in vacuum so slow?
"Why" is an ambiguous question, but in this case the Anthropic Principle can actually give us an answer: if light had infinite speed then the entire universe would be at the same temperature, and it's hard to see how any complex chemistry could arise in that.
Sep
27
comment What causes this pattern of sunlight reflected off a table leg?
If you don't have a laser, the shadow of your hand will behave the same way.
Sep
18
awarded  Critic
Sep
17
comment Can two bodies having the same internal energy have different temperatures?
NO. You still misunderstand the terms you're using, and you seem to be trying to fix it by random mutation.
Sep
17
comment Can two bodies having the same internal energy have different temperatures?
Your edit doesn't correct the error. Q is a change in energy. The first sentence of your answer is still either grossly misleading or false, depending on what "thermal energy" means. (And now you are using "substance" when perhaps you mean "body", I'm not sure.)
Sep
17
comment Can two bodies having the same internal energy have different temperatures?
What is "heat energy"? If it is an intensive property like temperature, then the term is a misnomer, since energy is an extensive property; if it not an intensive property, then the first sentence of your answer is incorrect.
Sep
16
comment How is it possible that the energy needed to stop a train is the same as the (chemical) energy in a pack of chocolate cookies?
@kojiro: put a hill in its path.
Sep
16
comment How is it possible that the energy needed to stop a train is the same as the (chemical) energy in a pack of chocolate cookies?
@steveverrill: It would be even more efficient to use a very strong and stupid man, and keep the biscuits just out of his reach.
Aug
5
comment Why do magnets silence anvils?
I'd first test the effect with the magnet hidden from the smith's sight.
Jun
8
awarded  Yearling
Apr
28
comment What is the theoretical lower mass limit for a gravitationally stable neutron star?
@RobJeffries: I... hadn't thought of that. I have not done the math. My intuition tells me that it will, but that proves nothing. It depends on the model, and if I'm wrong there must be a critical mass threshold that rises with time. Well, now I know what I won't be getting any work done for a while because of.
Apr
28
comment What is the theoretical lower mass limit for a gravitationally stable neutron star?
@RobJeffries: As I understand the state of Cosmology, there are several competing theories on the long-term fate of the universe, but the serious contenders agree that with time, the intensity of background radiation approaches zero. No black hole can have become small yet, but every black hole will become small some day.
Apr
23
comment Why don't things get destroyed by gas molecules flying around?
There are solid materials that can be quickly destroyed by the impact of air molecules at ordinary temperatures. And around here, they have been.
Feb
1
awarded  Popular Question
Nov
21
comment Melting diamond and cool down as diamond
Note that at standard temperature and pressure ("ordinary" conditions), diamond is unstable. Diamonds are somewhat rare because they form slowly in the Earth's mantle, then they must be carried up to the surface relatively quickly so that they don't have time to "relax" into graphite.
Oct
27
comment What is the theoretical lower mass limit for a gravitationally stable neutron star?
Theoretically, large black holes eventually turn into small black holes as they evaporate. It just takes a long time.