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Topic: Tidal drag


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In the News (Thu 26 Nov 09)

  
  Tidal locking - Wikipedia, the free encyclopedia
Almost all moons in the Solar System are tidally locked with their primaries, since they orbit very closely and tidal force increases rapidly with decreasing distance.
More subtly, the planet Venus is tidally locked with the planet Earth, so that whenever the two are at their closest approach to each other in their orbits, Venus always has the same face towards Earth.
Close binary stars throughout the universe are expected to be tidally locked with each other, and extrasolar planets that have been found to orbit their primaries extremely closely are also thought to be tidally locked to them.
en.wikipedia.org /wiki/Tidal_drag   (841 words)

  
 CE110 - CreationWiki   (Site not responding. Last check: 2007-09-29)
Because of tidal friction, the moon is receding, and the earth's rotation is slowing down, at rates too fast for the earth to be billions of years old.
A faster rotation rate for the Earth causes the tidal bulge to be larger, and this increases the net tidal force, which causes the moon to recede faster.
Tidal rhythmites are produced by tidal action, and so called fossil tidal rhythmites are assumed to indicate the moon's position in the past.
www.nwcreation.net /wiki/index.php?title=CE110   (1683 words)

  
 Estimation of drag coefficient in James River Estuary using tidal velocity data from a vessel-towed ADCP
A phase-matching method is introduced to calculate the bottom drag coefficient in tidal channels with significant lateral variation of depth.
The method is validated by identical twin experiments and applied to tidal velocity data, obtained in the James River Estuary, using an acoustic Doppler current profiler during spring tides and neap tides in October–November 1996.
The maximum drag coefficient is found in the shallowest water near the banks of the estuary, while the minimum values occur between 9 and 12 m in the center of the channel.
www.agu.org /pubs/crossref/2004/2003JC001991.shtml   (459 words)

  
 Paleontological Evidence for Old Age
It is claimed that stromatolites, fossil tidal rhythmites, and fossil bivalves and coral all have growth indicators showing more days in a year at the time when they lived.
According to uniformitarian geology the Earth and Moon are supposed to be 4.5 billion years, tidal drag is actually evidence against an old Earth.
Further more when observed tidal data is projected back based on the laws of physics the maximum age for the Earth is less than 1.2 billion years.
genesismission.4t.com /OE/Paleontological.html   (1431 words)

  
 Physics Help and Math Help - Physics Forums - The moons' spiraling oribts
Tidal locking is a result of the tidal strains that one body exerts on another in a gravitationally bound system.
It is a result of the tidal forces the earth exerts on the moon (of course, it could just be a huge coincidence, but what are the odds?).
The tidal effect transfers angular momentum from the planet to the moon in every case, so that if the moon is in a contrarotational orbit it will slow down and lose altitude, while those in a corotational orbit will gain altitude.
www.physicsforums.com /printthread.php?t=3150   (1715 words)

  
 [No title]   (Site not responding. Last check: 2007-09-29)
The model elevation accuracy depends on the drag strength because the modeled tidal energy is sensitive to the amount of drag10.
In the 1/4 and 1/2 present-day drag 45 ka experiments, LS M2 amplitudes are nearly equal to those in the 45 ka experiment with present-day topographic drag.
In the twice and four times present-day drag experiments (the latter being, in our opinion, a severe assumption), the amplitude decreases by about 20 and 45 percent, respectively, from the amplitude computed under the assumption of present-day drag.
www.aos.princeton.edu /WWWPUBLIC/arbic/supplementary.doc   (772 words)

  
 Moon and Tides
Another tidal outward bulge of water is to be found on the opposite side of the Earth.
The tides are produced by a component of the tidal force of the Moon which draws water along the earth's surface toward sublunar and antipodal points.
This is because the earth's rotation is slowing due to tidal friction.
www.thespaceguy.com /moontides.htm   (1259 words)

  
 i10 Wegener’s mechanism for continental drift
s force which is a consequence of the theory of isostasy on a spin-flattened earth, lunar tidal attraction, and, of less importance, the force of precession and the gravitational attraction between the continents.
To explain continental drift, Wegener considered four forces: the Eötvös force which is a consequence of the theory of isostasy on a spin-flattened earth, lunar tidal attraction, and, of less importance, the force of precession and the gravitational attraction between the continents.
Tidal friction and differences between the values of gravity at the tops and bottoms of continents are the agencies usually considered in theories of this type; they are capable of producing stresses of the order of 10
geowords.com /histbooknetscape/i10.htm   (1673 words)

  
 Tidal drag   (Site not responding. Last check: 2007-09-29)
En Drag -- Female Impersonation Revue Showcases the En Drag revue.
Energy from land tidal force The tidal activity in land is much smaller than that of in the sea because of its less flexibility and high density.
Drag Race Canada Drag racing from a Canadian perspective.
www.serebella.com /encyclopedia/article-Tidal_drag.html   (340 words)

  
 sciforums.com - Slowing of Earth's rotation??
Transfer of angular momentum to the sun and moon due to inner core drag resistance to the precession of the equinoxes and the obliquity cycle.
Tidal friction - something that is not influenced by humans, is the primary factor in why this is happening.
As rotational energy is passed to the moon through tidal friction, the rotation of earth slows [EDIT: and the distance between the earth and moon increases].
www.sciforums.com /showthread.php?p=723429   (2081 words)

  
 what is the cause of tides? - Bad Astronomy and Universe Today Forum
The tidal bulge created by the pull of the Moon's gravity is pulled ahead of the Moon by the Earth's rotation, hence the Moon does not lie exactly over the high tide but rather lags behind.
This is slowing the Earth's rotation (the bulge is being dragged by the Moon), and causing the Moon to recede (the bulge is also dragging the Moon, pulling it forward and into a slightly higher orbit).
The textbook mechanism for this is the 'swing pushing' of the orbit of the moon relative to the rotational velocity of the earth.
www.bautforum.com /showthread.php?t=12847   (2129 words)

  
 Chapter 7, Section 6   (Site not responding. Last check: 2007-09-29)
Thus, instead of one tidal bulge, there are actually two—one pointing toward the Moon, the other toward the Sun—and the interaction between them accounts for the changes in the height of the tides over the course of a month or a year.
The tidal influence of one body another diminishes very rapidly with increasing distance—in fact, as the inverse cube of the separation.
Instead, because of the effects of friction, both between the crust and the oceans and within Earth itself, Earth's rotation tends to drag the tidal bulge around with it, causing the bulge to be displaced by a small angle from the Earth—Moon line, in the same direction as Earth's spin (Figure 7.24).
astronomy.nju.edu.cn /astron/AT3/AT30706.HTM   (1617 words)

  
 AIMS - North west shelf modelling workshop - Presentation Summary, Large and mesoscale oceanography
Indicators of tidal mixing (Field and Gordon 1996) are widespread on the Shelf, and tidal mixing may explain why summer SST over the Shelf shows no coastal minimum, despite moderately large offshore Ekman transports.
Where internal tidal effects are present, one would expect to see temperature variations on the scale of the spring/neap tidal cycle.
One hypothesis is that tidally generated internal waves lead to vertical mixing of water as it upwells.
www.aims.gov.au /pages/research/workshops/nws-mw/mw-07.html   (2633 words)

  
 [No title]   (Site not responding. Last check: 2007-09-29)
Additionally, there is no time for each person to resolve his or her position within the tidal formation within the time allotted for the call.
When a Once Removed call ends in a tidal formation, dancers are required to adjust their positions to become Once Removed from others in their group.
DRAG and DROP have evolved because they are workable solutions to this problem - How do we get everyone Once Removed from each other when they probably didn't know who they were Once Removed from and who was in their Once Removed group to begin with.
coyoungjr.home.att.net /or_strategies/or_ends_in_tidal_pg01.htm   (231 words)

  
 The Biblical Flood and the Ice Epoch
Hence the tidal upheaval from within the Earth must have been very much greater than the tidal upheaval on the Earth's surface, involving her relatively minute oceans.
Here tidal forces are amplified to an extent of being some 15 to 25 times as high as they are in the open oceanic locations of lower latitudes.
The drag was effected in an arcuate, sweeping pattern on the inside of the Earth's crust.
www.creationism.org /patten/PattenBiblFlood/PattenBiblFlood05.htm   (7027 words)

  
 Will The Earth Stop Rotating?   (Site not responding. Last check: 2007-09-29)
The number may not be correct, but the concept is. In the same way that the moon has rotates around the earth, the earth will eventually rotate around the sun...
Larry Krengel ========================================================= There is a small tidal drag on the earth caused by the gravitational forces of the moon and sun which have a small effect on the earth's rotation, but the effect, while measurable, is exceedingly small.
On the other hand, the reason the moon always presents the same face to the earth it is believed was caused by tidal drag of the earth on the moon, which is much greater because the mass of the moon is so much smaller than that of the earth.
www.newton.dep.anl.gov /askasci/ast99/ast99498.htm   (312 words)

  
 Rough Topography   (Site not responding. Last check: 2007-09-29)
Our research on flow over rough topography is focused on the mechanisms by which the large scale tidal flow is broken up into smaller, more chaotic motions which eventually feed turbulence.
The main currents here are tidal, mixed semi-diurnal in character, moving up and down Main Basin past TTP at about 15 cm/s.
Tidal flow past TTP is deformed in two ways.
www.ocean.washington.edu /people/faculty/parker/rough_topography.htm   (852 words)

  
 Nat' Academies Press, Eclipse: The Celestial Phenomenon That Changed the Course of History (2001)
In the case of the Earth there is braking due to tidal drag, because the continents prohibit the free movement of the tidal swell right around the globe, and in consequence the planet’s spin angular momentum reduces.
Subtracting that from the tidal drag imposed by the Moon and Sun, the value of 2.3 milliseconds, the overall change measured directly is 1.7 milliseconds.
The tidal friction due to the Sun produces a change that must be taken up by the orbital angular momentum of the Earth, and in consequence the mean Earth-Sun separation increases a little.
www.nap.edu /books/030907438X/html/147.html   (4329 words)

  
 Year - Wikipedia, the free encyclopedia
The gravitational influence of the Moon and planets changes the shape of the Earth's orbit.
Tidal drag between the Earth and the Moon and Sun increases the length of the day and of the month.
This in turn depends on factors such as continental rebound and sea level rise.
en.wikipedia.org /wiki/Year   (1616 words)

  
 tidal electrical generator   (Site not responding. Last check: 2007-09-29)
Without these fairings the drag of the ties would be enormous, wasting about one third of the power.
For the very largest rotor sizes it may be necessary to cross-brace the rings with ties running from each spar attachment to a point on the opposite side of the rotor to improve stability on the upstream arc.
The velocities in the best tidal streams are about one fifth of typical wind cut-out speeds, but over the time-scale of tens of minutes they are much steadier and also accurately predictable.
www.yfinnie.demon.co.uk /contents5/VerticalRotor.html   (1083 words)

  
 tides
The moon produces two tidal bulges on the earth on a line connecting the centers of the earth and moon.
As the water flows it experiences drag against the continental shelves, and is pushed to the side by coriolis forces from the spinning earth.
The change in the water level in the sewer was due to the motion of the surface of the earth in response to tidal forces from the moon and the sun.
www.exo.net /~pauld/activities/tides/tides.html   (2064 words)

  
 POL SRP1 - Fine Resolution Eastern Irish Sea Model   (Site not responding. Last check: 2007-09-29)
The effect on tidal current profile of changes in bottom friction coefficient is found to be influenced by the proximity of the open boundary to the region of interest.
Numerical models are generally run with uniform values of bed friction coefficient, although it is known that in principle this coefficient should change according to the nature of the bed.
The effect of spatially varying the bed friction as a function of bed composition is investigated and shown to have relatively small effect on tidal currents but a significant effect on the bed stress derived from the model.
www.pol.ac.uk /coin/eismodel.html   (369 words)

  
 Marine System Analysis Group - Research: Baroclinic wave drag and tidal-induced diapycnal mixing
Tidal dissipation seems to occur not only in coastal areas but also to a large extent in the open ocean.
It is hence a possible energy source for vertical mixing in the ocean and thereby to the deep-reaching branches of the global ocean circulation.
The goal of the program is to further develop the theoretical knowledge of the role of baroclinic wave drag on the vertical mixing in oceans and seas.
www.marsys.se /research_baroclinic.htm   (321 words)

  
 Armada Legends: Tidal Wave, Top Gear, Twirl, Waterlog   (Site not responding. Last check: 2007-09-29)
Tidal Wave isn't without emotions, but neither is he intelligent or cunning by any stretch of the imagination.
Tidal Wave's spark resides in the gunboat, which can control the other two from up to 2,500 miles away.
WEAKNESSES Tidal Wave has no known physical weaknesses, but his lack of intelligence means that he constantly needs to be told what to do.
www.talkaboutparenting.com /group/alt.toys.transformers/messages/718631.html   (2080 words)

  
 why is the moon drifting into space - Physics Help and Math Help - Physics Forums
The Earth, however, turns on its axis and friction between the body of the Earth and the tidal bulges tends to drag the tidal bulges along.
Tidal patterns on Earth would, I think, slow the moon down-sort of like spinning a raw egg compared to a hard boiled one.
Part of this energy goes to a rise in potential energy of the earth-moon system because of the extra forces between the bulges and the moon (a torque is exterted between the bulges and the moon because both are NOT aligned).
www.physicsforums.com /showthread.php?p=497154   (1859 words)

  
 Encarta: The Discovery of Extrasolar Planets
As this happened, the gravitational pull from the bulging tide on the star would pull the planet forward, adding angular momentum to the planet, which moves it into a larger orbit and halts its death spiral into the star.
The protoplanet can remain in a stable orbit, delicately balanced between the tidal drag from the disk and the tidal pulls forward from the spinning star.
This last Jupiter is the one that survives today, when tidal forces from a protoplanetary disk no longer pull it toward the sun.
astron.berkeley.edu /~gmarcy/encarta.html   (4764 words)

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