MARS - Test 2 Study Guide - Marine Science 1010 Test 2...

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Marine Science 1010 Test 2 Study Guide Chapter 11: I. High and Low Tides a. Important impact on marine organisms, navigation, coastal ocean circulation II. Types of Tides a. Diurnal – one high and one low tide per day b. Semidiurnal – two high tides and two low tides per day; tides are around the same height c. Semidiurnal Mixed – two high tides and two low tides per day; tides are different heights III. What mariners care about a. Diurnal tides – mean low water b. Semidiurnal tides – mean tide level and mean low water c. Semidiurnal mixed – mean lower low water IV. Why do we have tides? a. Gravitational pull from the moon and the sun V. Earth-Moon Center of Mass and Rotation a. The Moon and Earth orbit about their center of mass once every 27.3 days b. Water bodies experience a new tidal cycle every 27.3 days VI. Geometry and Motion of the Earth-Moon System a. The Moon takes the same amount of time to revolve around the Earth as it takes to rotate around it spin axis 27.3 days b. One side of the moon always faces the Earth c. Moon orbits the Sun at the same speed and takes the same amount of time as the Earth because the Moon is orbiting the Earth and the Earth is orbiting the sun VII. Centrifugal Force a. Apparent force felt by an accelerating body b. V=linear velocity c. R=radius of the pathway followed by m d. For the moon and the Earth to keep orbiting their center of mass, the gravitational and centrifugal forces must be equal VIII. Tidal bulges and the Equilibrium theory a. Earth is completely covered with water of uniform depth b. An infinite amount of time is allowed for equilibrium to become established c. Two tidal bulges will be formed: one directly beneath the moon and the two other directly away from the moon on the opposite side of the Earth d. Earth’s rotation is once every 24 hours e. Earth’s rotation relative to the moon is 24 hours and 50 minutes, which is a lunar day f. Tidal bulges remain in the direction of the moon and the Earth spins beneath
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g. A point on the earth will then travel through two tidal bulges i. Produces two high tides and two low tides IX. The Moon’s Rotation a. The moon’s orbit is inclined to the plane of the equator b. The line joining the center of the earth to the of the moon makes an angle ranging from -28.5 ° to +28.5 ° c. Has an effect on tides depending on where you are in the Earth X. Earth-Moon-Sun System a. Earth-Moon rotation cycle is 27.3 days b. In 27.3 days, the Earth-Moon-Sun system is no longer inline c. It takes another 2.2 days before the Earth-Moon-Sun center of masses are inline d. Synodic month is 29.5 days i. Successive spring tides/neap tides is 14.75 days XI. Spring-Neap Cycle a. Spring tides – largest range between low and high water b. Neap tides – smallest range between low and high water XII. The Moon Tide a. The Formation of the bulges and depressions b. The Earth is completely covered with water of uniform depth c. Two tidal bulges will be formed: one directly beneath the moon and the
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This note was uploaded on 09/21/2011 for the course MARS 1020 taught by Professor Binder during the Fall '08 term at University of Georgia Athens.

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MARS - Test 2 Study Guide - Marine Science 1010 Test 2...

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