/sci/ - Science & Math

>>9879369
Faster

>>9879374
fpbp

>>9879369
>magical matter than can go at exactly the speed of light

>>9879374
But nothing is faster than light

>spinning at the speed of light
What do you even mean by that?

>>9879383
Are you retarded?

>>9879369
>If gear B was spinning at the speed of light, how fast would gear A spin?
As the gear B is made of matter, it has mass, and therefore it can't spin at the speed of light. However the Ehrenfest paradox is far from trivial (as it is impossibility to synchronize clocks in a rotating reference frame).

>>9879383
Points on the edge of gear B is moving at the speed of light

>>9879382
Then it's a good thing that there isn't enough energy in the universe to power that cog to c

>>9879402
There is an infinite amount of energy in the universe tho

>>9879402
You don't need to get gear B to c, if you get to 0.9c, gear A will still reach c

>>9879369
They'd break.
>b-but muh perfectly rigid bodies of indestructible matter
If you want to throw all the other rules out, then sure. Gear A surpasses c. Congratulations on demonstrating you can violate the laws of physics in a hypothetical universe where they don't even apply.

>if I could go faster than c then I could go faster than c

>>9879416
/thread

>>9879405
prove it

>all these brainlets
Both gears would have the same tangential velocity at the gear teeth, always. This is how gears work.

>>9879452
shit he's right

>>9879383
Only non-brainlet so far

We have a disk with a handle on it, protruding halfway between the center and the edge (midpoint of some radius) and a dot on the edge.
You spin the handle at 0.75c (this is totally possible). How fast does the dot move?

>>9879383
really fast.

>>9879399
Then the point at edge of gear A also spins at the same speed.

>>9879452
Holy freaking crap.

Should have spotted that instantly. I am calling myself a Mister Brainlet for the rest of the day.

>>9879369
B never gets to the speed of light because it has to accelerate A as it speeds up. As A approaches the speed of light, the energy B needs to increase the speed of A goes to infinity.

wither you are stupid, or trying to bait stupid people with your shitpost.

Why are the teeth on the gear square?

>>9879551
Relativity.

And Quantum.

>>9879406

>>9879430
Infinite universe = infinite mass and energy

>>9879589
>infinite universe
prove it

>>9879593
Space is black, so it means that it does not reflect light, therfore it is infinite

>>9879599
>space is black
prove it

>>9879599
>make nanocarbon superblack material
>it does not reflect light, therefore it is infinite
>infinite carbon nanotubes
>infinite money
>buy the universe
why has no one figured it out

>>9879402
And as the cog reaches infinite mass you will never have enough energy

>>9879416
this

>>9879405
Infinite energy is not enough to power infinite mass to c, even though it will have all the time in the universe.
It's short by exactly 1 infinity.

>>9879405
energy in our universe is limited

Since it's rotating does anything different happen as it's speed approaches infinity compared to linear movement?

>>9879369
>In an impossible situation, what impossible outcome would happen?

>>9879668
well, it would tear apart for one

>>9879658
The total energy of the universe is 0

>>9879369
Here's another explanation, B spinning at the speed of light means the teeth moving that fast. Since gear B meshes with gear A, A moves at the speed of light also.

>>9879932
This desu the speed of light is not measured in RPM.

>>9879405
>>9879921
t. brainlet

>>9879932
>Since gear B meshes with gear A, A moves at the speed of light also.
This.

It amazing how many people in this thread want to talk about relativity, but don't understand how gears work.

i know /sci/ went to shit around the 2016 primaries but jesus.
if we make the assumption that both gears are massless, they are both spinning at the speed of light.
you faggots know i'm right. reference frames and duality.
boom. GUT, first accurate thought experiment posted right here, on this dead board.

>>9879975
>accurate thought experiment
>massless indestructible rigid bodies
why are physicists so fucking bad? why can't they actually deal with real world problems that actually affect people instead of larping about how smart they are in hypothetical situations?

>>9879593
Flat universe implies infinite universe. Also, dark energy seems to be increasing, so the total energy of the universe is rising with time.

>>9879975
>if you make the assumption that both gears are massless
they radiate away at c without spinning

>>9879985
>Hey guys if these two gears are spinning at the speed of light what happens
>They break
>No no I mean if they're idealized
>Well okay then [idealized answer]
>Lmao look at the physishits idealizing lol why aren't you doing real life problems

>>9879629
Needs Troll Physics drawing.

>>9879970
Retards, the RPM is faster than the speed of light then >>9879943

B wouldn't be able to reach c because A will limit the velocity of B, since c is the maximum velocity.

>>9880058
Go ahead and tell us what c is in RPM then, anon. We're waiting. Because that's fucking retarded. Make a gear that has a diameter of 1 light minute divided by pi, and you have a gear with points on the outer edge going at light speed when turned at 1 RPM.

>>9879383
>he doesn't know how to drift photons

>>9879996
thanks bro, i answer in context and this is what happens.

>>9879369
speed of light

>whole board turns out to be retarded
thanks OP, for demonstrating this so spectacularly

>>9879599
>space is infinite
>big bang gave birth to space
>therefore big bang had infinite mass

>>9879656
do you mean "one times infinity" or just "a larger infinity?"
>Those aren't the same thing

>muh speed of light thread
>OP actually confusing the rotational period of a disc with velocity
>all these serious replies
This has got to the most brainlet thread i've seen all month

>>9882000
You can calculate the rotational velocity given the period and radius, retard

>>9882006
clearly he did confuse them, since the only way rotational velocity would be increased is by swapping the gears.

His set-up is a gear ratio that maximizes the rotational period, as if that was the goal here

>>9879369
If gear B was spinning gear A at the speed of light, both would have melted from friction. :-)

>>9879416
That's actually the best answer so far.

>>9879369
You guys are retarded. If the edges of B move near the speed of light, then the edges of A will also move near the speed of light, but the gear will have a higher rotation rate. This doesn't break any physics...

>>9879369
>>9882085

Place another, much larger gear coaxial to A and you will have something moving faster than light.