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Topic: Tidal bulge

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tidal locking

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	* Bulge - (Astronomy): Definition
		Bulge of the Earth The extra extension of the Earth's equator, caused by the centrifugal force of the Earth's rotation, which slightly flattens the spherical shape of the Earth.
		The bulge on the side of Earth that faces the moon is caused by the proximity of the moon and its relatively stronger gravitational pull on that side.
		a squashed with a bulge at the equator.
	en.mimi.hu /astronomy/bulge.html (1406 words)

	tidalevolution
		The moon pulls up this tidal bulge on the earth, there is a time delay between the pull of the moon and the time when the tidal bulge reaches its maximum height.
		The tidal bulges on the earth, which have been pulled in front of the earth moon line by the rotation of the earth, also exert forces on the orbit of the moon.
		The height of a tidal bulge on a planet is proportional to the inverse cube of the distance between the planet and the object causing the tidal bulge.
	www.exo.net /~pauld/physics/tides/tidalevolution.htm (754 words)

	Tides
		Tidal observations made over long periods of time are used to calculate the average or mean tidal level (MTL).Averages are also determined for the low- and high- tide levels.
		That is, the tidal waves generated by the moon and sun interfere destructively and tides are the smallest of the month.
		The dimensions of the Bay of Fundy are such that interference of the tidal wave with itself yields a 2-meter tidal range at the mouth of the bay and an 11-meter range at the head of the bay.
	core.ecu.edu /geology/woods/TIDES.htm (2240 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-10-13)
		The tidal force is a secondary effect of the force of gravity and is responsible for the tides.
		For a given (externally generated) gravitational field, the tidal acceleration at a point with respect to a body is obtained by vectorially subtracting the gravitational acceleration at the center of the body from the actual gravitational acceleration at the point.
		Tidal effects become particularly pronounced near small bodies of high mass, such as neutron stars or fl holes, where they are responsible for the "spaghettification" of infalling matter.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=tidal_force (773 words)

	Life in the Crust
		In most moons in the Solar System, this tendency is overpowered by the fact that each moon has acquired a slight permanent tidal bulge in its rocky body, and its home planet's tidal pull urges the moon to keep that bulge pointed straight toward the planet throughout each orbit.
		Greenberg and his colleagues have noted that Europa's surface cracks follow an odd pattern: cracks further to the west tend to be "rotated" as compared to their fellow cracks further to the east -- in a clockwise direction in the northern hemisphere, counter-clockwise in the south.
		Their calculations show that this is exactly what you would expect if Europa's surface was rotating slightly faster than its revolution period around Jupiter, so that the point on its surface where the tidal bulging (producing the cracks) is greatest is slowly but constantly migrating further west.
	www.spacedaily.com /news/life-00p2.html (457 words)

	Tidal force - Wikipedia, the free encyclopedia
		The tidal force is a secondary effect of the force of gravity and is responsible for the tides.
		Tidal effects become particularly pronounced near small bodies of high mass, such as neutron stars or fl holes, where they are responsible for the "spaghettification" of infalling matter.
		Tidal forces, in combination with centripetal forces, create the oceanic tide of Earth's oceans, where the attracting bodies are the Moon and the Sun.
	en.wikipedia.org /wiki/Tidal_bulge (867 words)

	[No title]
		The height of these tidal bulges is controlled by the moon's gravitational force and the Earth's gravity pulling the water back toward the Earth.
		However, this bulge is due to the fact that at this point on the Earth the force of the moon's gravity is at its weakest.
		Tidal wave is a steep wave moving upstream generated by the action of the tide crest in the enclosed area of the river mouth Tidal datum is the reference level to which tidal height is compared.
	bss.sfsu.edu /ehines/geog646/646F02_class3.doc (1448 words)

	tidalevolution
		The moon pulls up this tidal bulge on the earth, there is a time delay between the pull of the moon and the time when the tidal bulge reaches its maximum height.
		The tidal bulges on the earth, which have been pulled in front of the earth moon line by the rotation of the earth, also exert forces on the orbit of the moon.
		The height of a tidal bulge on a planet is proportional to the inverse cube of the distance between the planet and the object causing the tidal bulge.
	isaac.exploratorium.edu /~pauld/physics/tides/tidalevolution.htm (754 words)

	Tidal locking Information
		The tidal locking situation for asteroid moons is largely unknown, but closely-orbiting binaries are expected to be tidally locked, as well as, obviously, contact binaries.
		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.
		Note also that during the tidal locking phase, the orbital radius a may have been significantly different to that observed nowadays due to subsequent tidal acceleration, while the locking time is extremely sensitive to this input.
	www.bookrags.com /Tidal_locking (1804 words)

	Tidal acceleration - RecipeFacts (Site not responding. Last check: 2007-10-13)
		The tidal acceleration of the Moon is an effect in the dynamics of the Earth-Moon system, that has important long-term consequences for the orbit of the Moon and the rotation of the Earth.
		Tidal acceleration is one of the few examples in the dynamics of the solar system of a so-called secular perturbation of an orbit, i.e.
		Tidal friction (dissipated as heat) is required to drag and maintain the bulge ahead of the Moon.
	www.recipeland.com /facts/Tidal_acceleration (2113 words)

	Tides
		Tidal action is an important force behind coastal erosion and deposition as the shoreline migrates landward and seaward.
		The tidal bulge forms as the gravitation force exceeds the inertial force on the near side.
		Thus tidal bulge, is greatest on the side of the Earth facing the Moon or Sun ("near side") simply because it's closer than the "far side" of the Earth.
	www.uwsp.edu /geo/faculty/ritter/geog101/textbook/coastal_systems/tides.html (591 words)

	News \| Gainesville.com \| The Gainesville Sun \| Gainesville, Fla. (Site not responding. Last check: 2007-10-13)
		The gravitational torque between the Moon and the tidal bulge of the Earth causes the Moon to be accelerated in its orbit, and the Earth to be decelerated in its rotation.
		Tidal friction is required to drag and maintain the bulge ahead of the Moon, and it dissipates the excess energy of the exchange of rotational and orbital energy between the Earth and Moon as heat.
		The tidal acceleration on the Earth due to the tiny tides raised on the Sun's surface by the Earth is indeed small.
	www.gainesville.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=tidal_acceleration (2430 words)

	Mathematical Explanation of Tides
		Tidal acceleration is therefore approximately proportional to the CUBE of the distance of the attracting body.
		This suggests that the oceans' tidal bulge directly under where the Moon is should be around 0.367 meter or 14.5 inches high out in the middle of the ocean.
		The nearside water is therefore piled into a tidal bulge due to the fact that the water is nearer the Moon and therefore attracted with a greater acceleration.
	mb-soft.com /public/tides.html (4554 words)

	Tidal locking - Definition, explanation
		The rotation of the tidal bulge out of alignment with the body that caused it results in a small but significant force acting to slow the rotation of the first body relative to the second.
		Since it takes a small but nonzero amount of time for the bulge to shift position, the tidal bulge of the satellite is always located slightly away from the nearest point to its primary in the direction of the satellite's rotation.
		This bulge is pulled on by the primary's gravity, resulting in a slight force pulling the surface of the satellite in the opposite direction of its rotation.
	www.calsky.com /lexikon/en/txt/t/ti/tidal_locking.php (841 words)

	Tidal force - Definition, explanation
		For a given gravitational field, the tidal acceleration at a point with respect to a body is obtained by vectorially subtracting the gravitational acceleration at the center of the body from the actual gravitational acceleration at the point.
		The tidal force within the body tends to distort its shape without altering its volume; supposing it was initially a sphere, the tidal force will tend to distort it into an ellipsoid, with two bulges, pointing towards and away from the other body.
		Tidal forces, including the additional term explained in the next section, are also responsible for the oceanic tides, where the reference body is the Earth with the water in its oceans, and the attracting bodies are the Moon and the Sun.
	www.calsky.com /lexikon/en/txt/t/ti/tidal_force.php (610 words)

	A descriptive explanation of ocean tides.
		One way to get a feeling for the size and direction of these tidal forces is to use vector polygons to calculate the difference between the gravitational force the moon exerts at a point on earth and the force it would exert at the center of the earth.
		This is the reason for the tidal bulges, and it is these bulges that drive the periodicity of the shoreline tides that we observe while basking on the beach, as the earth turns on its axis underneath these tidal bulges.
		That's why tidal forces on earth due to the sun are much smaller than those due to the moon, even though the sun's mass is very much greater than the moon's mass.
	www.lhup.edu /%7EDSIMANEK/scenario/tides101.htm (968 words)

	Lunar recession: does it support a young universe?
		Tidal forces are not the same thing as the gravity that keeps the moon orbiting around the earth.
		With the earth bulging, the moon is “pulled” by the point of gravity (point 1), produced by the bulge, since it is closer to it (line A) than the point of gravity (point 3) at the opposite side of the earth (line C).
		With the earth where it is today (Figure 2) tidal bulges are much smaller (than the theoretical past), making the “pulling” force of point 1 smaller; thus the angular momentum is much less, resulting in the present and seemingly more-constant recession rate of 4 cm per year.
	www.answersingenesis.org /home/area/feedback/2006/0811.asp (1043 words)

	Tidal Torque -- from Eric Weisstein's World of Physics
		Because of internal friction, the maximum tide height lags the applied force and the bulges are displaced.
		Tidal torques on bulges oppose and slow down rotation on the moon (until it becomes tidally locked) and the planet When rotation of the planet slows, angular momentum is conserved and the orbital radius of the satellite increases for a prograde satellite, but decreases for a retrograde satellite.
		is the angle by which the bulge leads the satellite-planet axis, and r is the orbital distance of the satellite, and the sign is negative because the torque opposes rotation.
	scienceworld.wolfram.com /physics/TidalTorque.html (266 words)

	Catch A Star! 2004, Project 292, Tidal Forces in the Solar System
		Tidal forces in general are the result of differences of gravitational forces, caused by the areal expanse of mass concentrations in a grav.
		Because planets are not perfectly rigid, they deform when subjected to such tidal forces (Earth also bulges at the equator all the way around because it is spinning).
		Recall that tidal forces occur from differential gravity forces created on an object because of the difference in distance on either side of say, a comet from a planet or Sun.
	www.eso.org /outreach/eduoff/edu-prog/catchastar/casreports-2004/rep-292 (2537 words)

	rantlust » Blog Archive » Tidal energy
		Perhaps this is obvious to everyone else, but there is something about tidal energy that bothers me. We all know that tides come from gravity and the relative motion of the moon around the earth.
		‘Obviously’ any tidal energy that we extract from this system is either taken away from the rotational energy of the earth about its own axis or the rotational energy of the moon around the earth (let’s ignore solar tides for now).
		Hmm … I thought the acceleration of the moon was because the tidal bulge was assymetrically shaped owing to the rotation of the earth, and the extra mass was what was pulling the moon (transferring the earth’s rotational energy to the moon).
	www.rantlust.com /tafkap/2006/09/10/tidal-energy (878 words)

	Department of Marine Science
		Tides are caused by the Earth's rotation beneath the tidal bulge.
		Tidal periods are either 12 hours, 25 minutes or 24 hours, 50 minutes depending on location.
		The reason why tidal periods are not 24 hours or 12 hours in length is that the Moon moves forward in its orbit each day.
	www.usm.edu /marine/mar151/MAR_151_Chap_8a.html (810 words)

	Ivars Peterson's MathTrek - Extreme Tides
		Tidal effects are caused by the gravitational force exerted on a satellite by its host planet and on the planet by its satellite.
		Ideally, a planet is stretched to produce a bulge that reaches its maximum extent along a line connecting the planet's center to that of the satellite.
		Tidal amplitudes, however, tend to be much less extreme.
	www.maa.org /mathland/mathtrek_01_19_04.html (652 words)

	[No title]
		So the gravitational theorist will stress that the tidal bulges on the Earth are caused by the difference in the forces due to the Moon at the two sides of the Earth.
		This lateral tidal compression is certainly present in the tidal force due to the Moon but is balanced by the dilation due to the inertial forces of orbit and this occurs at or close to the orbital path.
		The oceanic tidal minima on the Earth are not due to a lateral compression any more than they were when the Earth and Moon were given equal masses.
	www.geo.ucalgary.ca /~duckwrth/tides.html (1486 words)

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