jeudi 29 janvier 2015

The Moon and Tides

I was reading something about the tides and it doesn't make sense to me, I'm sure one of you will come along and straighten me out.



Consider the following two statements:




Quote:








Tides are not caused by the direct pull of the moon's gravity. The moon is pulling upwards on the water while the earth is pulling downward. Slight advantage to the moon and thus we have tides.



The gravitational force of the moon is one ten-millionth that of earth, but when you combine other forces such as the earth's centrifugal force created by its spin, you get tides.



Since the moon's gravitational force is so much less that that of the earth, how can the moon have a "slight advantage" in pulling on the water?





via International Skeptics Forum http://ift.tt/15MKAWK

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