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The earth is smoother than a billiard ball.
Quote from: Bored chemist on 13/07/2011 20:56:36The earth is smoother than a billiard ball.And if you were to redistribute the mass on a billiard ball you may also find that this effects its rotational axis.....
Quote from: Airthumbs on 14/07/2011 05:54:18Quote from: Bored chemist on 13/07/2011 20:56:36The earth is smoother than a billiard ball.And if you were to redistribute the mass on a billiard ball you may also find that this effects its rotational axis.....Indeed, for example, if I moved all the mass a metre to the left, then I would move its rotational axis a metre to the left.However, if it started and d=ended billiard ball shaped, then I wouldn't affect its moment of inertia. (assuming uniform density)
So if the cows let 'em rip with high enough velocity, could they eject the earth's atmosphere into space?
I have not heard of a farmer blowing up their cowshed due to methane buildup?
Quote from: Airthumbs on 18/07/2011 12:18:39I have not heard of a farmer blowing up their cowshed due to methane buildup?I did read of a case not so long ago where several people on a farm were asphyxiated by methane. If I remember, it was released from a slurry pond....sorry, you cannot view external links. To see them, please
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The conclusion seems to be that cow farts don't speed the earth up (no matter which way they are facing) for any length of time and they may slow it down (depending on whether or not the methane levels in the atmosphere attributable to cows are stable).
Great analogy; I wonder if Geezer accepts it.
What if the bus was propelled by a certain gas produced by the animal in question? 
vehicles would travel clockwise around roundabouts, and that could contribute.
Quote from: Bored chemist on 23/07/2011 16:05:31Great analogy; I wonder if Geezer accepts it.Almost, but not quite.The bus was accelerated, therefore it was "made to move faster". Then it slowed down again and stopped.However, the bus did not return to its original position, so we can't say the net effect was nil.
Also, the vehicles on the roundabouts have the same problem. They are part of the earth/ air/ cow/ fart/ vehicle system, and can not influence the overall angular momentum of the system.There would be short term effects, but they would stop when the cars stopped or left the roundabouts. In particular, most effects would be cancelled out when the vehicles drove home.
You would introduce a change in phase, but not frequency, of rotation.
Quote from: Bored chemist on 24/07/2011 14:41:51You would introduce a change in phase, but not frequency, of rotation.Say what? How do you change phase without altering frequency?
I used to get up at 08:30 to go to work each day, but I changed my job.Now I get up at 06:30.That's a change in phase but it was always once a day so the frequency is the same.The Sunrise does the same thing every day, it's once a day but the phase changes WRT noon.
Yes, it changed by zero.
OK, it was 1/86400Hz before and it was 1/86400Hz afterwards.What does old maths give as the difference between those?There was a change, but that was a one off event; it doesn't have a frequency (unless you count zero).
What apodisation did you plan to use for the FT?
Quote from: Bored chemist on 27/07/2011 22:31:51What apodisation did you plan to use for the FT?Enough to prove that the frequency changed.
Please show your working
The Earth's frequency is a function of its angular velocity. The time at which you start work has nothing to do with your angular velocity, so there was no phase shift in that case.