PHYS 1000 Lecture Notes - Lecture 5: Ionosphere, Chlorofluorocarbon
7 Oct 2020
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Document Summary
Surface gravity is the strength of the gravitational force on the body"s surface. Escape speed is the speed required for an object to escape forever the body"s gravitational pull. The semimajor axis of the moon"s orbit around earth is 384,000 km. Tides are due to gravitational force on earth from the moon force on near side of. Earth is grater that force on the far side. The sun has a less effect, but it does modify the lunar tides. We call this variation of the strength of a force across a body, a tidal force. This will lead to two sets of high and lows tides each day. Earth"s rotation drags the tidal bulge with it so it is just ahead of the earth-moon line. The moon"s gravitational pull on this offset bulge will actually slow our planets rotation. The rate is about 2 milliseconds a century.
