show without a contradiction that the sweep rate speed of a tail of a comet can exceed the speed of light.
Simple answers: nothing can exceed the speed of light, but what does "nothing" mean? If I take a laser pointer and sweep it across the moon in .01 seconds, the dot on the moon will move the full diameter of the moon, 3000 miles, in .01 seconds, [ which is a speed of 300000 mps, nearly double the speed of light. The light image can move faster than the speed of light even though the photons that make it up move at the speed of light. The trick is it is not the same photons all the time, you are continually supplying new photons. I assume the comet's tail is the same, it is always shedding
new particles, so you do not have any particle travelling faster than light. As for the iron, that would have to do with heat transfer. If there is not enough time for a significant amount of heat to enter the hand then there will be no burn. I do not know how long that would be, I suspect for molton iron not too long. (and you need to know that molten iron does not have the same property as water of making things wet - if it sticks to the hand the specific heat should be high enough for a pretty bad burn) source: yahoo ]
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