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# I teach Cheeeeese Special Relativity!!! watch

1. (Original post by CheeseIsVeg)

I love me some physics
We have the point of view from the person outside the train looking at the light clock.

Assuming the distance between the light clocks (vertically) is one meter, can you use Pythagoras to work out the time it takes for the light to travel from the bottom mirror to the top one according to the outside observer?

Start off with (ct)2 = 12 + (vt)2

2. (Original post by Kyx)
We have the point of view from the person outside the train looking at the light clock.

Assuming the distance between the light clocks (vertically) is one meter, can you use Pythagoras to work out the time it takes for the light to travel from the bottom mirror to the top one according to the outside observer?

Start off with (ct)2 = 12 + (vt)2

Wait what do ct and vt mean?
Velocity time?
Speed of light time?
3. (Original post by CheeseIsVeg)
Wait what do ct and vt mean?
Velocity time?
Speed of light time?
Yes. We know that distance = speed multiplied by time. So they give distances
4. (Original post by Kyx)
Yes. We know that distance = speed multiplied by time. So they give distances
Let me go to the library and figure this out
5. (Original post by CheeseIsVeg)
Let me go to the library and figure this out
OK
6. CheeseIsVeg u dunnit yet?
7. (Original post by Kyx)
CheeseIsVeg u dunnit yet?
No, ran out of time, sorry , will do it after break
8. (Original post by CheeseIsVeg)
No, ran out of time, sorry , will do it after break
No problemo

Listening to Slipknot
9. (Original post by Kyx)
No problemo

Listening to Slipknot
Wossat
10. (Original post by CheeseIsVeg)
Wossat
Some heavy metal band. They're really good
11. (Original post by Kyx)
Some heavy metal band. They're really good
Stromae is better
12. (Original post by CheeseIsVeg)
Stromae is better
ok
13. The speed of light is a funny thing and really, really counter-intuitive.

It takes about 8 minutes for light from the sun to reach us. If you were in a ship going the speed of light towards the sun, you would expect that light that left the sun at the same time you left the earth would reach you when you and it got halfway along - So the light would approach you at 2* the speed of light.

But that doesn't happen. For some reason. It still takes 8 minutes for the light to reach you, because it doesn't matter that you moved relative to the light itself. THIS IS INSANE.

You would expect if you were travelling away from earth at the speed of light that any light from the sun would never reach you. That, also, is lightspeed changing relative to you. That also doesn't happen.

THIS IS INSANE AND LIGHT IS CRAZY!
14. (Original post by ThatOldGuy)
The speed of light is a funny thing and really, really counter-intuitive.

It takes about 8 minutes for light from the sun to reach us. If you were in a ship going the speed of light towards the sun, you would expect that light that left the sun at the same time you left the earth would reach you when you and it got halfway along - So the light would approach you at 2* the speed of light.

But that doesn't happen. For some reason. It still takes 8 minutes for the light to reach you, because it doesn't matter that you moved relative to the light itself. THIS IS INSANE.

You would expect if you were travelling away from earth at the speed of light that any light from the sun would never reach you. That, also, is lightspeed changing relative to you. That also doesn't happen.

THIS IS INSANE AND LIGHT IS CRAZY!
The speed of light is 'c', for 'constant'
15. Tomorrow, I forgot
BOut to go into my interview session
16. (Original post by CheeseIsVeg)
Tomorrow, I forgot
BOut to go into my interview session
OK. Tomorrow.
17. (Original post by Kyx)
OK. Tomorrow.
sorry kyx
18. (Original post by CheeseIsVeg)
sorry kyx
Tomorrow. Or else.
19. (Original post by Kyx)
Tomorrow. Or else.

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