PRESIDENT GEORGE W. BUSH Message Board

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Politics : PRESIDENT GEORGE W. BUSH

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To: ManyMoose who wrote (154864)	6/22/2001 1:55:28 AM
From: ManyMoose	Read Replies (1) of 769667

The market for ocean front property in Arizona just heated up for those who believe what they see on PBS! Re: THERE IS MORE Subject: Physics of Earth's tilt Reply Posted by: Lawrence B. Crowell Date Posted: Wed Jun 20 13:52:29 US/Eastern 2001 Message: I watched the Moyer's program Earth on Edge. It discussed agricultural and fisheries issues. It appeared to avoid the issue of industrial and urban structures. Overall it was a worthy program. I also found the following hilarious: MELANIE STIASSNY: No I'm not kidding. That's the actual fact is we have redistributed the weight of our planet. And one of the ways we measure that is in what's called the length of the day. And we've actually measurable changed the length of day of our planet by redistributing the weight. So that's all happened in my lifetime ----------- This one is really a hoot! The Earth has a weight of 10^{24}tons, and the oceans contain a mass of 10^{18} tons. So the weight of the oceans is one millionth that of the total Earth. Fresh water consists of 3% of total water of which 80% is stored in lakes such as the Great Lakes and Lake Baikal, most of the rest in rivers. So our dams might at best elevate .1% of the total water an average of a kilometer up. Well that means that 10^{12} tons of water is elevated upwards. The moment of inertia of the Earth is that of a solid sphere I = (2/5)mR^2, with R the radius and m is the mass So the change in the moment of inertia would involve a &R/R ~ 10^{-4} and would involve a mass that is ~ 10^{-12} that of the Earth. So as a first order calculation just assume a moment of inertia associated with this change &I = &m(&R)^2. This comes down to &I/I ~ 10^{-20}. It does not take much to imagine that this is not going to change the energy associated with the Earth's angular momentum E = (1/2)I\omega^2 in any significant manner. I would be curious to know what measured data there is supposed to exist on this. Lawrence B. Crowell

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