Nothing is faster than Light, Right?

  • Thread starter Algren
  • Start date
  • #1
74
1

Main Question or Discussion Point

First of all, lets consider that this question is asked before neutrino's speed was discovered.

" Lets consider a rod, a rod which is as long as 1 light year.

Consider that it is a rigid rod of steel with diameter 1m (to prevent bending)

I gave a nudge to it from one side, then the whole rod will displace, right?

For example, i pushed the rod by 1m, then the rod will move 1m, right?

Ohh, look what happened! Something went faster than light! A lot faster! "

If you didnt get the above case, ill explain what happened:

I used the rod to send a 'message' by pushing and pulling it. Hence, it traveled faster the speed of light, since it conveyed the message through 1 light year almost instantly.

If you disagree with the above, give approximations of the speed of the message, if its not faster than 'c'.
 

Answers and Replies

  • #2
berkeman
Mentor
57,682
7,705
Please read the FAQ in the Special & General Relativity forum about this question. The signal propagates at the speed of sound in the rod.

https://www.physicsforums.com/showthread.php?t=536289 [Broken]

.
 
Last edited by a moderator:

Related Threads on Nothing is faster than Light, Right?

Replies
13
Views
1K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
9
Views
2K
  • Last Post
Replies
11
Views
2K
  • Last Post
Replies
17
Views
2K
Replies
14
Views
1K
Replies
63
Views
8K
  • Last Post
Replies
16
Views
4K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
1
Views
2K
Top