Main Question or Discussion Point
drunken musings..... if i was sat on the wing of a jet travelling at mach2 would i be able to hear the the noise of the engine behind me?
Certainly not as cool of an experience, however.You don't have to sit on the wing. The same effect occurred in Concorde when it accelerated through Mach 1 and the engine noise disappeared in the passenger cabin, apart from a small amount of noise transmitted through the structure of the plane itself and not through the air.
thats not what the OP asked. youre explaining why the speed of sound is related to density.The speed of sound is relative to the density of the medium it is travelling in. Thus it is faster in water than in air and faster at ground level than at altitude. Although Mach 2 airflight is commonplace nowadays, no vehicle has achieved Mach 1 at ground level yet. The new land speed record attempt at 1000 miles an hour will seek to achieve that.
PS Global warming isn't a theory; it's a lie!
not at all, the argument itself is banned. you would be told off if you posted a tonne of scientific journals supporting global warming. also opinions cant be proven and QED is a pretty ridiculous thing to say there.If the belief that global warming is a lie is banned, it proves that you have no support for its existence - QED
what are you talking about?Speed of sound is not relative to the motion of the observer - heard sound is only only relative to your ear - ears do not observe. Would we hear a sound behind us - no - consider the Doppler Effect
the reason global warming is a banned topic is because this IS a scientific site and there is so much opinion and emotion involved whilst so little actual science is provided when people talk about it. moderating the discussion to ensure that it stayed scientific would require an expert (which this forum doesnt have) in the field to devote their time to moderating crackpot loony theories. because we dont have an expert here, the topic is banned in order to make sure that this site doesnt become a pseudo-science mess.OK, I am banned - global warming is an opinion, so ban yourself - this is not a scientific site
The speed of sound is related to the rate of propagation of a wave in the media, and it's also affected by temperature (speed of sound increases if temperature increases and vice versa).The speed of sound is relative to the density of the medium it is travelling in.
Rocket sleds routinely acheive high mach speeds. The Thrust SST was the first "official" human driven vehicle to exceed the speed of sound.No vehicle has achieved Mach 1 at ground level yet.