|
|
 Up |
  |
| Re: A Riddle for Relativists. |
|
 |
|
 |
|
 |
|
 |
Group: sci.physics.relativity · Group Profile
Author: AndroclesAndrocles Date: May 11, 2008 17:07
"Dr. Henri Wilson" wrote in message
news:6nue24dnifgp18l199n46idkiqjsu0kie9@4ax.com...
| On Sun, 11 May 2008 12:42:04 +0100, "Androcles"
| wrote:
|
| >
| >"Dr. Henri Wilson" wrote in message
| >news:ckbd24pr78emkrl49f820ct9e7ua1himne@4ax.com...
|
| >| >wheel
| >| >| >and pinion - it only works by having an exact ratio - and that's
what
| >| >| >you have in the clock, an exact ratio)
| >| >| >
| >| >| >Your point is moot.
| >| >|
| >| >| My point is that one doesn't count the wheel turns by measuring the
| >amount
| >| >of
| >| >| fuel used.
| >| >
| >| >25 mpg, 12" radius wheels, 5280 feet to the mile,
| >| >840 wheel turns per mile, 25 * 5280/2pi = 21,008 wheel turns per
gallon.
| >| >Why not?
| >|
| >| All right! I challenge you to cover you speedometer and judge you speed
by
| >| watching your fuel gauge. Don't ask me to pay you speeding fines....
| >
| >
| >
| >I wouldn't ask you the time of day, you upside-down aussies don't even
know
| >when summer is.
|
| Summer, winter...there's not much difference where I live.
Nor here, it's always winter. I sometimes wish I was back in the States,
but the living is easier. I get disability payments here that are beyond
reproach.
|
| >| >A strobe is often used to measure engine RPM.
| >| >When the shaft appears stationary in the strobe light,
| >| >the frequency of the strobe is used to measure the engine
| >| >RPM. What's wrong with that?
| >| >Only one thing. The RPM can be any exact multiple of the
| >| >strobe frequency and still appear stationary.
| >| >For low ratios we can be fairly certain that an engine designed
| >| >to run at 1000 RPM and a 1000 Hz strobe isn't running at
| >| >2000, 4000, 8000 or 16,000 RPM, but if its only a 100 Hz
| >| >strobe we are less certain about it being 1,000 or 900 RPM.
| >|
| >| yes
| >
| >Egads... mark it on the calendar, Wilson agreed!
|
| Everyone should know how a strobe works.
|
| >So now we come to the frequency comb, which will indeed
| >measure the doppler-shifted frequency of the arriving light but
| >will not measure the frequency of the emitting light.
|
| Wait a minute. A frequency comb is supposed to measure the beat frequency
| between light and a modulation UHF wave.
Yeah... everyone should know how a strobe works and what a beat frequency
is,
there isn't much difference -- mathematically none at all.
|
| >Since both the wavelength (as measured by a change in angle
| >at a diffraction grating) AND the frequency are doppler-shifted,
| >some dingbats will incorrectly conclude that the speed of light
| >is unchanged.
| > c = wavelength * frequency
| > c = (wavelength/shift) * (frequency*shift)
| > = wavelength * frequency * shift/shift
| > = wavelength * frequency * 1
| >
| >whereas
| >c+v = wavelength/shift * frequency at source.
|
| there's no doppler shift. All part of the experiment are M.A.R.
You are rambling again. What the fuck is MAR?
|
| >Only the wavelength changes.
| > http://www.androcles01.pwp.blueyonder.co.uk/Wave.xls
|
| What the hell is that?
Beyond your capabilities, obviously.
| >Feel free to check the equations.
|
|
|
|
|
|
|
