L17 Tides - Geol 107 L17 Tides The longest ocean waves...

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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. h l h f id b h lf h The wavelength of tides can be half the circumference of earth Tides are forced waves because they are never free of the forces that cause them. Tides are caused by a combination of gravity and motion among the Earth, Moon and Sun Moon s 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 Much larger mass than the moon (x27 million!) but further away (x 390 times).
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