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Old 13-03-2006, 02:31   #1
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if a car

if a car was to travel at the speed of light what would happen when you switched the headlights on ...?
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Old 13-03-2006, 05:03   #2
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Re: if a car

there is no answer to this question unfortunately(infinite energy required for your car to reach 'c' [1]m/s),

If you were close to c, effectively the wavelength of the reflected light would be doppler shifted well into UV so you wouldn't 'see' anything. in the UV spectrum things would appear rotated.

I don't suppose this post goes any way to dispelling teh idea I'm a geek now does it?


[1] c is 3x10^8m/s and is defined as a constant(teh speed of light in a vacuum)
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Old 13-03-2006, 08:28   #3
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Re: if a car

Quote:
Originally Posted by entwisi

I don't suppose this post goes any way to dispelling teh idea I'm a geek now does it?

Nope
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Old 13-03-2006, 09:06   #4
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Re: if a car

Quote:
Originally Posted by entwisi
there is no answer to this question unfortunately(infinite energy required for your car to reach 'c' [1]m/s),

If you were close to c, effectively the wavelength of the reflected light would be doppler shifted well into UV so you wouldn't 'see' anything. in the UV spectrum things would appear rotated.

I don't suppose this post goes any way to dispelling teh idea I'm a geek now does it?


[1] c is 3x10^8m/s and is defined as a constant(teh speed of light in a vacuum)
Thanks entwisi that just went right over my head.
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Old 13-03-2006, 09:21   #5
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Re: if a car

OK, heres a nice article with pictures

http://www.itp.uni-hannover.de/~drag...ge/stone1e.htm

Bit 'involved' if you read the words but looking at the pictures you will get an idea how stuff would get distorted
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Old 13-03-2006, 11:30   #6
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Re: if a car

Quote:
Originally Posted by chav1
if a car was to travel at the speed of light what would happen when you switched the headlights on ...?
You'd lose your licence, don't try it.
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Old 13-03-2006, 11:43   #7
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Re: if a car

Quote:
Originally Posted by garinda
You'd lose your licence, don't try it.
How, Gatso's are not fast enough. They tested one on Top Gear, I think you had to do 160 or 170mph before it could not get you.
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Old 13-03-2006, 12:04   #8
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Re: if a car

Thats only gatsos though, forward facing lasers are good into 300mph. above that its pretty clear that you are speeding and the coppers say so is enough. They don't have to give an exact speed.
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Old 13-03-2006, 15:48   #9
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Re: if a car

Quote:
Originally Posted by entwisi
Thats only gatsos though, forward facing lasers are good into 300mph. above that its pretty clear that you are speeding and the coppers say so is enough. They don't have to give an exact speed.
gotta catch me first
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Old 13-03-2006, 17:36   #10
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Re: if a car

Quote:
Originally Posted by chav1
if a car was to travel at the speed of light what would happen when you switched the headlights on ...?
You'd meet yourself coming back.
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Old 13-03-2006, 20:57   #11
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Re: if a car

The light of the headlights would light up your posterior!
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Old 13-03-2006, 21:09   #12
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Re: if a car

What would happen? you'd crash of course, you wouldn't be able to see where you was going, as your travelling at the same speed as the light coming off the bulbs you'd be there before the light, therefore it would be dark, and you'd crash.
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Old 14-03-2006, 09:15   #13
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Re: if a car

Ah but you miss Einsteins theory of Relativity states that light must still travel at the same speed in all frames of reference so the light would leave you the same, the major problem would be in viewing the reflected light due to the doppler shift taking the 'visible' light and shifting it into UV. So you 'could' see if you were able to 'see' in the UV spectrum.

However as teh link Iposted earlier shows what you 'see' would be surreal to say teh least.
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Old 14-03-2006, 13:30   #14
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Re: if a car

You'd still crash because you'd be travelling faster than the light coming towards you from other vehicles, stationary objects etc (which is how we see things) so you wouldn't see them and you'd crash into them.
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Old 14-03-2006, 13:32   #15
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Re: if a car

Quote:
Originally Posted by chav1
if a car was to travel at the speed of light what would happen when you switched the headlights on ...?
Another fan of Brainiac:Science Abuse, then?
Jon Tickle's a legend...
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