I'm obviously a bit dim..
.. but why didn't M$ buy all the shares it could at $19.20 instead of offering $31..
Paris 'cos she hasn't got a clue either.
38 posts • joined 2 Jul 2007
Mach number is a measure of speed related to the speed of sound.
As this test was conducted in Helium, the speed of sound is higher and thus Mach 1 = 972 m/s compared with 331 m/s for air (both at 0 deg C)
So, was the actual speed Mach 9 Helium (31432 km/h) or Mach 9 Air (10724 km/h)? Given that they think it was only "probably" not a good idea to run a rocket sled through a hydrogen tunnel I think we know the answer...
"Modern transmitters can be incredibly efficient, with efficiencies exceeding 98 per cent. However, a broadcast transmitter with a megawatt power stage transferring 98 per cent of that into the antenna can also be viewed as a 20 kilowatt electric heater."
98% of a megawatt is 980 kw where I come from. 20kW is the heat lost in the amplifier, not radiated.
Someone said "What's most likely is that intelligent people, including the best teachers, who could get work elsewhere legged it when the rain started glowing in the dark. This selective migration would lower the average intelligence and teacher quality having a compound effect on academic outcomes."
I think you'll find that teachers moving away has a benificial effect on average intelligence... :P
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