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/sci/ - Science & Math

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5514694 No.5514694 [Reply] [Original]

Hey squints, I have a few questions:

>why does hot water freeze faster than cold water?
>if the sun exploded, would the sudden lack of gravity be felt immediately or would it take the 8 minutes it takes light to reach earth?
>if the universe is approx 15 billions years old and nothing can go faster than light, why is the universe much much bigger than 15 billion light years in size?

>> No.5514707

>>5514694
>Overt racism
>High school questions
>Expecting not to get reported

>> No.5514714

because you touch yourself at night

>> No.5514730

>>5514707

Sorry, what's racist? Are you saying that Jewish people are a race? I thought we were all one race.

>> No.5514734
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5514734

>> No.5514737
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5514737

>>5514707
>mfw these are actually valid answers for all of the questions asked.
Well played.

>> No.5514738
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5514738

>>5514734

>> No.5514742

>>5514694
If the sun exploded, one myriad of tons of sun would be converted into one myriad of tons of rubble. No less gravity there.
Over time, space gets bigger. Things aren't accelerated though space, space expands and takes things with it. If you look at the difference of expansion "speed" between two distant points in space, that difference _can_ exceed the speed of light.

>> No.5514748

>>5514742

You''re right and I realized I phrase my question wrong. Rather than exploding, I shouldn've said suddenly disappeared, just gone.

>> No.5514770

>>5514748
That does not happen, mass-energy is conserved. If you converted the sun into light all at once, that much light would still exert the same gravity (Just as light is diverted by the gravity of a black hole)
(I cannot give you a "What if" answer to that one, because the equations all assume that mass-energy is conserved. "If the sun disappeared, we would finally have definite proof that our current models of physics are wrong or we are in a simulation, etc.")

>> No.5514781

>>5514694
>why does hot water freeze faster than cold water?
Because gas is more soluble at lower temperatures, heating water removes gas from it so nothing gets in the way of it freezing.
>if the sun exploded, would the sudden lack of gravity be felt immediately or would it take the 8 minutes it takes light to reach earth?
No it would probably take effect after everyone freezes to death so it wouldn't be felt at all.
>if the universe is approx 15 billions years old and nothing can go faster than light, why is the universe much much bigger than 15 billion light years in size?
Because the light that tells us so has been travelling for 15 billion years, to account for the lost time where the universe has been expanding the figure for the diameter of the universe needs to be much bigger.

>> No.5514790

>>5514694

>>if the sun exploded, would the sudden lack of gravity be felt immediately or would it take the 8 minutes it takes light to reach earth?

8 minutes, If not you could make an FTL communicator based on gravitons