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Nov
29
awarded  Nice Question
Oct
26
comment Why don't choir voices destructively interfere so that we can't hear them?
@chasly I think it's because the human brain processes incoming signals using an algorithm similar to autocorrelation, and not simply listening for certain frequencies. Even with one microphone, there are computer algorithms that can detect that somebody is singing off-key. With just one ear you can't find out who it is, though.
Sep
8
comment Why do we launch rockets during the day?
I don't think performing an interplanetary transfer matters either. Spacecraft typically orbit several times before doing the escape burn, so it doesn't matter when the launch happens as long as it's prograde.
Jul
31
awarded  Curious
Jul
30
comment How does a converging-diverging nozzle not violate conservation of energy?
What is the point of such nozzles if the pressure (and thus density?) decreases after acceleration, then? Isn't having dense air accelerate a little bit equivalent to having thin air accelerating a lot, in terms of thrust generation?
Jul
30
asked How does a converging-diverging nozzle not violate conservation of energy?
Dec
27
comment Can you find the length of a pencil without a ruler or clock?
@RobJeffries: The scale on the meter is shrunken too. I guess my question is actually "how to measure lengths when all the scales are shrunken in proportion"
Dec
27
comment Can you find the length of a pencil without a ruler or clock?
@RobJeffries: Instruments etc are shrunken, but not atoms or cells etc. Basically, you are given objects built to be of different size, and drugged to perceive time differently, not put in a place where spacetime is shrunken. The "you are shrinked too" part is just to prevent cheating by using yourself as a ruler.
Dec
27
awarded  Popular Question
Dec
27
awarded  Nice Question
Dec
26
awarded  Editor
Dec
26
revised Can you find the length of a pencil without a ruler or clock?
added 343 characters in body
Dec
26
comment Can you find the length of a pencil without a ruler or clock?
How can you use a force meter? Assume that the force meter is, too, shrinked in proportion.
Dec
26
comment Can you find the length of a pencil without a ruler or clock?
Can you give an example of how this works with actual numbers? Does this imply that if you were shrinked by a magical potion and placed in a miniature room, no time-altering potion could fool you into thinking you were in an unshrinked room?
Dec
26
asked Can you find the length of a pencil without a ruler or clock?
Nov
24
comment Does spinning actually decrease the time experienced by the spinner?
But the decrease in momentum to the Earth is also utterly insignificant. Which of the two effect is more utterly insignificant?
Nov
23
asked Does spinning actually decrease the time experienced by the spinner?
Sep
28
asked Why does unequal mass distribution cause orbital decay?
Sep
24
awarded  Autobiographer
Jul
1
accepted What happens when two high-speed objects going opposite directions crash into a black hole?