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Subject: Thrust ssc

obi_jon 28.04.17 - 06:12pm

@ tranie - 28.04.17 - 04:02pm
in reality he wouldnt see you as he would be traveling at 12.75 miles per second you would just be a smudge on his windscreen

This. You would get a fraction of a seconds warning as the sonic shockwave by an object passing through the sound barrier travels in front of said object. * +

mikeymk 28.04.17 - 08:59pm

@ fir3hill - 28.04.17 - 02:47pm
If you were standing in the road, and Richard noble was approaching in his jet powered car at 763 mph, if he sounded the horn, would you hear it in time to jump out of the way?

Yes.

Because, the speed of the sound of the horn is being projected from a point already travelling at the speed of sound, and therefore, it is approaching twice the speed of sound.

Something cannot give off a sound wave, and overtake that sound wave, with no other variation. Unless something else is brought into the equation which would additionally slow sound, but not the car. But then you're bending the basic principal using possible circumstance. *

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