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May
16
asked What could cause a 30 k g acceleration?
Apr
28
awarded  Yearling
Mar
5
comment Will two trains running along the equator in opposite direction experience same wear out?
I would have liked to see SI units here. Remember that there are only 3 countries which don't have adopted SI: Burma, Liberia, and the US. (Should we count the US as a developing country henceforth?)
Mar
5
awarded  Commentator
Mar
5
comment Radio-dating and the age of the earth
I'm aware of zircon. But if it doesn't contain any lead it must have formed very recently, maximum tens of millions of years ago. And if the uranium is older there must be lead somewhere, not incorporated in the zircon. So you have an amount of uranium, of which you don't know how many percent of the original it is. And without this ratio there's no dating.
Mar
5
asked Radio-dating and the age of the earth
Aug
23
comment At same level do these two pipe lines give same pressure of water?
@Yrogirg - But "pressure drop" indicates a difference, dynamic pressure can be absolute, and at any point, BTW, not just at the exit. The dynamic pressure equation you quote is a function of velocity, so that's flowing, right?
Aug
23
comment At same level do these two pipe lines give same pressure of water?
@Yrogirg - What terminology should I use then?
Aug
23
revised At same level do these two pipe lines give same pressure of water?
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Aug
23
answered At same level do these two pipe lines give same pressure of water?
Aug
23
awarded  Citizen Patrol
Aug
23
comment How does power consumption vary with the processor frequency in a typical computer?
I'm not sure about the accuracy of the graph, (and the reference bottom right doesn't seem to give me much reason to :-)). The graph says dynamic power would be around 10 W at 1.6 GHz, and 100 W at 4.8 GHz? That's a factor 10, where we would expect a factor 3. Also, if it's linear below 1.6 GHz it would consume 10 mW at 1.6 MHz, which is extremely low for a processor with around a billion transistors, like the i7.
Aug
23
revised Friction in Physics
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Aug
23
answered Friction in Physics
Aug
23
comment How does power consumption vary with the processor frequency in a typical computer?
No, you're quite right, but the power due to the leakage current is only a small fraction of dynamic power. Even though it rises exponentially with temperature total power at 85 °C will be a few orders of magnitude larger, so the static power will bend the curve only slightly.