/sci/ - Science & Math » Thread #12094880

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Speed of energy thread kekw

Anonymous Mon 07 Sep 15:06:50 2020 No.12094880 View Reply Original Report

Quoted By: >>12094895 >>12094990 >>12095091

Like imagine swinging pendulums but at a total length of a light year. If A hits first, when will B show movement. Assuming that the entire frame of reference is stationery. Will it take a year for B to move or will it be instantaneous?

Anonymous

Anonymous Mon 07 Sep 2020 15:17:35 No.12094895 Report

Quoted By: >>12094902

>>12094880
My intution tells me it would just come to rest and make the ball bounce back without doing much to the other balls.

Anonymous

Anonymous Mon 07 Sep 2020 15:20:26 No.12094902 Report

Quoted By: >>12095100

>>12094895
Broo... It bounces back after the B finishes a swing hits back.. Energy thus is transferred to A. WHY would it just bounce back?

Anonymous

Anonymous Mon 07 Sep 2020 15:58:17 No.12094990 Report

Quoted By:

>>12094880
kinetic energy doesn't travel at the speed of light.
It'll take more than a year.

Anonymous

Anonymous Mon 07 Sep 2020 16:45:18 No.12095091 Report

Quoted By: >>12095116 >>12095119

>>12094880
It will travel at the speed of sound of the ball material. The maximum this could be is c

Anonymous

Anonymous Mon 07 Sep 2020 16:48:54 No.12095100 Report

Quoted By: >>12095116

>>12094902
In a small cradle yeah, but if it's litterally 1 light year wide, the mechanics are completely different. (The signal would travel at the speed of sound, which would be much slower than the speed at which the energy would disperse, probably)

Anonymous

Anonymous Mon 07 Sep 2020 16:54:18 No.12095116 Report

Quoted By: >>12095124 >>12095133 >>12095138 >>12095282

>>12095091
>>12095100
why the speed of sound? What? the relation between sound and motion?

Anonymous

Anonymous Mon 07 Sep 2020 16:54:55 No.12095119 Report

Quoted By: >>12095133 >>12095138 >>12095282

>>12095091
Speed of sound?? We are talking about kinetic energy. Assume the whole experiment is in vacuum with no loss of k.e via sound waves. I hope i have clarified others query too.

Anonymous

Anonymous Mon 07 Sep 2020 16:55:59 No.12095124 Report

Quoted By: >>12095282

>>12095116
Exactly... Lmao

Anonymous

Anonymous Mon 07 Sep 2020 16:59:31 No.12095133 Report

Quoted By:

>>12095116
>>12095119
t. never took a physics class

look up coefficient of restitution

Anonymous

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Anonymous Mon 07 Sep 2020 17:01:16 No.12095138 Report

Quoted By: >>12095511 >>12095540 >>12095542

>>12095116
>>12095119

Is this supposed to be bait...
You do know that hitting an object causes a mechanical wave to propagate through the material right? And that this is what carries the "signal" through the Newton's cradle... And that a speed of sound can be defined for materials and not just air...

Anonymous

Anonymous Mon 07 Sep 2020 17:51:03 No.12095282 Report

Quoted By:

>>12095116
>>12095119
>>12095124
>the ABSOLUTE state of /sci/

Anonymous

Anonymous Mon 07 Sep 2020 18:03:27 No.12095313 Report

Quoted By:

God I hate this shithole.

Anonymous

Anonymous Mon 07 Sep 2020 19:08:34 No.12095511 Report

Quoted By: >>12095540

>>12095138
Hmm... But that mechanical wave is energy dissipated out right? What if i consider it a no energy loss experiment. Or Maybe u r right... Idk.. Just a thought experiment. It wasnt a bait.. Jk

Anonymous

Anonymous Mon 07 Sep 2020 19:17:51 No.12095540 Report

Quoted By: >>12095549

>>12095138
>>12095511
>What if i consider it a no energy loss experiment.

What is the "speed" of a longitudinal wave?

Anonymous

Anonymous Mon 07 Sep 2020 19:18:29 No.12095542 Report

Quoted By: >>12095545

>>12095138
Clear this for me.. Isnt transmission of force instantaneous? Like i hit a ball and it starts rolling... Where are the mechanical waves in this?..

>the ABSOLUTE state of /sci/
?

Anonymous

Anonymous Mon 07 Sep 2020 19:20:09 No.12095545 Report

Quoted By: >>12095556

>>12095542
objects are small
mechanical waves fast

are you able to observe with your own eyes a wave traveling at thousands of m/s in the length of 10cm? no. you can't.

Anonymous

Anonymous Mon 07 Sep 2020 19:21:05 No.12095549 Report

Quoted By: >>12095554

>>12095540
Exactly what i am asking.

>longitudinal wave?

I never mentioned it. All i said was "transmission" of force from one pendulum ro to an another and so on till it reaches B.

What i meant was is transmission at the speed of light?

Anonymous

Anonymous Mon 07 Sep 2020 19:22:55 No.12095554 Report

Quoted By:

>>12095549
no, the energy is transferred as vibrations in the material. this vibration occurs at a certain speed in different materials, and is notably less than the speed of light.

Anonymous

Anonymous Mon 07 Sep 2020 19:23:24 No.12095556 Report

Quoted By: >>12095570 >>12095618

>>12095545
So if i have a sphere of dia 1 light year, u are saying if i give it enough force to produce an acc of 1 cm/s... Then it takes some time for the sphere to actually start to move?

Anonymous

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Anonymous Mon 07 Sep 2020 19:23:49 No.12095557 Report

Quoted By:

>mfw this whole fucking thread

It was a good try OP

Anonymous

Anonymous Mon 07 Sep 2020 19:24:50 No.12095560 Report

Quoted By:

Fuck newton who always considered objects as point objects... :c it is fucking with my brain...

Anonymous

Anonymous Mon 07 Sep 2020 19:26:08 No.12095566 Report

Quoted By:

Gg :( thought i was at a major breakthrough.. Lol

Anonymous

Anonymous Mon 07 Sep 2020 19:28:06 No.12095570 Report

Quoted By: >>12095577

>>12095556
neglecting the insane amount of force it would take to move a 1 light-year sphere, here's what would happen:
(consider the object to be a 1 light-year long rod since it's easier)
>push one end of the rod
>you compress that side of the rod a tiny amount into the rest of the rod (dependent on the compressibility of the material)
>the compression ripples through from the end of the rod you touched all the way to the other side at a speed relating to the speed of vibration in the rod

otherwise you would be able to transmit information faster than the speed of light
this also happens with rods that are 1cm long, just the process happens so fast that you can't see it with your eyes. it can be observed with precision technology though.

Anonymous

Anonymous Mon 07 Sep 2020 19:29:51 No.12095577 Report

Quoted By: >>12096697

>>12095570
this is because there's no such thing as an "infinitely rigid" material, otherwise when you pushed one end the other end would move immediately.

Anonymous

Anonymous Mon 07 Sep 2020 19:42:57 No.12095618 Report

Quoted By:

>>12095556
Here's a video https://youtube.com/watch?v=B5K1bFrFoPE

Anonymous

Anonymous Tue 08 Sep 2020 03:03:49 No.12096696 Report

Quoted By:

Thanks anons!

Anonymous

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Anonymous Tue 08 Sep 2020 03:04:17 No.12096697 Report

Quoted By:

>>12095577
> there's no such thing as an "infinitely rigid" material

I got something to consider not perfectly rigid

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