Newcomer / Intro c = ?

m0nk3n

M
apparently dividing 28000Mm with 0.90 becomes 3.1111. while dividing 28000 with 0.10 becomes 280000.

it's strange since right after you see Mm once the speed decreases from 0.10c, it says 28000Mm, 1000KM\h\s is 1Mm.. whhaaat am i doing?!? :S
 
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TYK

T
Probably importan to note that 1ls (one light second) is the distance you travel in 1 second while moving at exactly c (the speed of light).
 

Aleksej

Aleksej
m0nk3n said:
apparently dividing 28000Mm with 0.90 becomes 3.1111. while dividing 28000 with 0.10 becomes 280000.

it's strange since right after you see Mm once the speed decreases from 0.10c, it says 28000Mm, 1000KM\h\s is 1Mm.. whhaaat am i doing?!? :S
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c = 299792458 metres per second, i.e. 299792.458km/s, 299.792458Mm/s. So, it is obvious that 0.10c is 29.9792458Mm/s.
 

the100thmonkey

the100thmonkey
C is the speed of light in a vacuum.

It's actually slower in some kind of medium like glass or air. I remember learning in school that this was the cause of diffraction in a prism - red wavelengths move more slowly in glass than blue wavelengths, which causes the separation of the spectrum.

Not sure if it's true though.
 

JohnRoberts

JohnRoberts
N6MAA10816 said:
...what does 'C' stand for while your at it?
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Actually, its "c" not "C".

The first use of the letter c was in a paper written by Weber and Kohlrausch in 1856, although this was not the speed of light, but c^0.5, and was referred to as Weber's Constant (and therefore, c meant constant). It was later adopted by Drude to denote the speed of electrodynamic waves, whilst at that time V was used to denote the speed of light. Gradually c took over (Einstein used V in 1905, but had adopted c by 1907).

Another interpretation is that it comes from the latin word celeritas, meaning speed. The speed of light is the only speed that all observers can agree on (it's not even possible for all observers to agree on what's travelling at 0m/s).
 

TYK

T
the100thmonkey said:
C is the speed of light in a vacuum.

It's actually slower in some kind of medium like glass or air. I remember learning in school that this was the cause of diffraction in a prism - red wavelengths move more slowly in glass than blue wavelengths, which causes the separation of the spectrum.

Not sure if it's true though.
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Other way around - diffraction is caused by the difference of the speed of light in the medium. The speed of light in air is faster than in, for instance, glass. So when a waveform hits the edge of the glass, one side of that wave slows down while the rest of the wave is still in the air. This causes the wave to "bend".
 

m0nk3n

M
(1)ls at lightspeed = regulatory factor, since light speed at 1 ls\s would take from the drop off point from jump speed to clark terminal faster than 1000c within 5 minutes.
 
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Rhaedas

Rhaedas
m0nk3n said:
apparently dividing 28000Mm with 0.90 becomes 3.1111. while dividing 28000 with 0.10 becomes 280000.

it's strange since right after you see Mm once the speed decreases from 0.10c, it says 28000Mm, 1000KM\h\s is 1Mm.. whhaaat am i doing?!? :S
Click to expand...

When your speed decreases, the last speed using c is .10. The next tick down would be .09c, but at that point it shows in Mm/s, so you see 28Mm/s (rounded to keep numbers pretty). .10c would be shown as 30Mm/s.
 
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TYK

T
m0nk3n said:
(1)ls at lightspeed = regulatory factor, since light speed at 1 ls\s would take from the drop off point from jump speed to clark terminal faster than 1000c within 5 minutes.
Click to expand...


I'm not sure what you're asking here. I have never seen the speed indicator read out at 1ls/s - I think an incorrect assumption has been made?
 
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