What happens when....
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If a vehicle is travelling faster than the speed of light what happens when it turns it's headlights on?
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The speeds are added.
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So if you were travelling next to the vehicle at the same speed would you see the light on of off?
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They are on.
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Question clarification.
Is that 'faster than the speed of light', 'at the speed of light' or 'approaching the speed of light' ?
Also is the vehicle traveling in a vacuum or in another medium where the speed of light might be lowered from 'C' ?
Also are we to postulate 'what happens' from the point of view of the car-driver/passenger or for a bystander watching the car pass by ?? -
@unknownuser said:
If a vehicle is travelling faster than the speed of light what happens when it turns it's headlights on?
@gilles said:
The speeds are added.
Wrong. Those speeds cannot be added.
From a more "realistic" example: when those jets pass the speed of sound, they literally "pas" it (overtake in British English) and "before" them, they do not have sound.
Back to the original post: it was obvious that the solution would be what TIG answered - you cannot deny that my answer was also entertaining though.
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So the speed of light doubles?
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If you were observing the car from a distance, you might see that the lights themselves were glowing (depends on the precise speed of the car and whether you, yourself, were travelling...and in which direction), but they wouldn't shine forwards like they normally do. If you were in the car, they would appear normal and would project forwards, as normal.
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I'm sitting in a train, is speed is 250Km/h, I decide to go to the bar my speed relative to the train is 10Km/h ( I'm in a hurry I do need that beer!).
So what is my speed relative to the ground? -
Are you moving forward or backward through the train?
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Forward
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1,930km/h
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250 km/hr + 10 km/hr + beer + another beer + another beer + double scotch + beer chaser.
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Sorry but I go backward 20Km/h to the toilets
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Well, I've made some presumptions...
Firstly I'm in a train travelling in the direction of the earths rotation. So I used simple addition
1,670km/h + 250 + 10
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What if the train falls into the hole and you run upwards. Does the train then fall faster?
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@gaieus said:
Yes. I do not even belive that Aussies do not fall off the planet.
Thanks Rich... THANKS A LOT!!! Now everybody know how to get here!!! I was hoping it was going to be kept a secret.
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The centerline-tunnel 'to Australia' adjunct to the original question is based on something of a false premise - see this http://www.freemaptools.com/tunnel-to-other-side-of-the-earth.htm
If the tunnel has one end in Australia, and passes through the center of the Earth then the other end is in the Atlantic Ocean [although you could contrive it to be on one of the small islands somewhere near the center?]. Chances are you tunnel will flood... which raises an interesting question, because we showed that 'you' falling through the hole would not come out in Australia, settling around the center after a lot of oscillating about it... BUT 'water-finds-its-own-level' and would it not therefore fill the hole from rim to rim? Thus making a very deep salt-water lake in Australia [ignoring the heat/boiling issues etc as last time...]Using the map provided in the link you can see that making a centerline-tunnel linking two major population centers is quite difficult, because all of the flippin' water about ! It's limited to say Beijing and Buenos Aires, Saigon and Lima, Lisbon and Auckland, parts of Indonesia and northern South America etc... but the USA misses almost everywhere except for Hawaii which hits somewhere in southern Africa!
If you were to go 'off-center' so as to link specific places, then you'll start to 'scrape' down the walls of the tunnel as you fall further in, as the Earth's center of gravity will exert an uneven pull off to the side nearest the 'core'.
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@tig said:
I
Note: if you were agile enough... on the first 'fall', just as you approached the other end and slowed to a standstill you could 'grapple' onto the tunnel's wall just below the rim, so with a little climbing 'up' you could pop out at the other end... but I suspect you'd be a bit knackered by then [if not dead] !!!
There must be easier way to get to Oz
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