L17 Tides

L17 Tides - Geol 107 L17 10/3/2011 Tides The longest ocean...

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Geol 107 L17 10/3/2011 1 Tides The longest ocean waves Tides The longest ocean waves Caused by the gravitational force of the moon and sun and the motion of earth. The wavelength of tides can be half the circumference of earth Tides are ±forced waves² because they are never free of the forces that cause them. Tides are caused by a combination of gravit and motion gravity among the Earth, Moon and Sun Moon³s gravity Relatively small mass, but close! Opposing bulge because of the Centrifugal Force around the center of mass of the Earth Ͳ Moon system (called the barycenter) ´see explanation in textbook p261) Low tide High tide Low tide High tide
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Geol 107 L17 10/3/2011 2 Tidal bulges follow the moon. Lunar calendar is important for Tides Lunar month or lunar cycle 29 ½ days Lunar day 24hrs 50 minutes moon rise 50 minutes later each Earth day Tides 50 minutes later each successive Earth day The Sun also plays a role
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This note was uploaded on 11/21/2011 for the course ECON 404 taught by Professor Carrillo during the Spring '11 term at USC.

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L17 Tides - Geol 107 L17 10/3/2011 Tides The longest ocean...

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