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Topic: Escape velocity

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	Escape Velocity - MSN Encarta
		In physics, escape velocity is the speed where the kinetic energy of an object is equal to the magnitude of its gravitational potential energy, as calculated by the equation U g...
		Escape Velocity, minimum initial velocity required for an object to escape the gravitational attraction of an astronomical body, and to continue traveling away from it without the use of propulsive machinery.
		The escape velocity of an object from a spherical astronomical body is proportional to the square root of the mass of the body divided by the distance between the object and the center of the body.
	encarta.msn.com /encyclopedia_761555512/Escape_Velocity.html (322 words)

	Escape Velocity: Planetary Reckoning
		It would appear that even the aspect of escape velocities seems to be registered in the historically significant numbers and their fractal expressions.
		This latter figure is totally feasible and within the range of the escape velocity for the surface of Earth.
		Remember that we said that the escape velocity most commonly cited for Earth in terms of miles per second is that of 6.94444 mps (in reference to 25000 mph); and that of 11.1 kms/s (and, 11.2 kms/s) for the metric system.
	www.earthmatrix.com /velociy_planetary.html (1701 words)

	Escape Velocity
		If the kinetic energy of an object launched from the Earth were equal in magnitude to the potential energy, then in the absence of friction resistance it could escape from the Earth.
		were equal in magnitude to the potential energy, then in the absence of friction resistance it could escape from the planet.
		Note that the orbit velocity and the escape velocity from that radius are related by
	hyperphysics.phy-astr.gsu.edu /hbase/vesc.html (114 words)

	Escape velocity - Wikipedia, the free encyclopedia
		On the surface of the Earth, the escape velocity is about 11.2 kilometres per second.
		The escape velocity from the surface of a rotating body depends on direction in which the escaping body travels.
		To leave planet Earth an escape velocity of 11.2 km/s is required, however a speed of 42.1 km/s is required to escape the Sun's gravity (and exit the solar system) from the same position
	en.wikipedia.org /wiki/Escape_velocity (1447 words)

	Escape velocity - Space Wiki
		In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling back or staying in an orbit within a bounded distance from the source.
		The simplest way of deriving the formula for escape velocity is to use conservation of energy, thus: in order to escape, an object must have at least as much kinetic energy as the increase of potential energy required to move to infinite height.
		The escape velocity at a given height is √2 times the speed in a circular orbit at the same height, compare (14) in circular motion.
	space.wikia.com /wiki/Escape_velocity (1458 words)

	Escape Velocity
		Escape velocity, in astronomy and space exploration, is the velocity that is sufficient for a body to escape from a gravitational centre of attraction without undergoing any further acceleration.
		Escape velocity decreases with altitude and is equal to the square root of 2 (or about 1.414) times the velocity necessary to maintain a circular orbit at the same altitude.
		The velocity of escape from the less massive Moon is about 2.4 km per second at its surface.
	abyss.uoregon.edu /~js/glossary/escape_velocity.html (131 words)

	Escape Velocity Question
		Escape velocity is the speed an object must be at so that it will escape an objects gravity without the need for thrust of any sort.
		Escape velocity is the speed at which that object would have to travel away from the gravitational object in order to \'escape\' it (move away indefinitely).
		Escape velocity is, in fact, related to the minimum energy at which a stable orbit cannot be reached.
	setiathome.berkeley.edu /forum_thread.php?id=25321 (3813 words)

	Escape Velocity@Everything2.com
		In easier to understand terms, escape velocity is an initial velocity one has to give to a body for it to be able to travel far enough from another body, in most cases the surface of a planet, to escape its gravitational pull without needing additional thrust.
		To be accurate, when I say escape I mean to escape a body's gravitational pull enough to go out into space and not fall back, as we all so far know gravity's force extends throughout all of space.
		Reaching escape velocity is not necessary to escape the gravitational pull of a planet.
	www.everything2.org /?node_id=54147 (824 words)

	escape velocity. The Columbia Encyclopedia, Sixth Edition. 2001-07
		the velocity a body must be given in order to escape the gravitational hold of some other larger body, e.g., the earth, moon, or sun.
		A body given less than the escape velocity will fall back toward the surface of the larger body; a body given a velocity equal to or greater than the escape velocity will still be attracted by the larger body, but this force will not be sufficient to cause it to return.
		Escape velocity depends on the mass of the larger body and the distance of the smaller body from its center, being proportional to the square root of the ratio of these two quantities.
	www.bartleby.com /65/es/escapeve.html (163 words)

	What is Escape Velocity?
		Escape velocity is the velocity at which a body must travel before it breaks free of the gravitational pull of a celestial body.
		Despite the size of Jupiter, the escape velocity is lower than one might think, due to the low density of the planet.
		Perhaps the most famous escape velocity is that of a fl hole's - equal to light.
	www.wisegeek.com /what-is-escape-velocity.htm (482 words)

	What is escape velocity?
		Escape velocity is defined to be the minimum velocity an object must have in order to escape the gravitational field of the earth, that is, escape the earth without ever falling back.
		Where m is the mass of the object, M mass of the earth, G is the gravitational constant, R is the radius of the earth, and v is the escape velocity.
		So, an object which has this velocity at the surface of the earth, will totally escape the earth's gravitational field (ignoring the losses due to the atmosphere.) It is all there is to it.
	www.physlink.com /Education/AskExperts/ae158.cfm (272 words)

	'escape' velocity Text - Physics Forums Library
		The "escape velocity"-concept refers to the situation where the SOLE force acting upon the vehicle is force of gravity.
		Thus, the "escape velocity" is the velocity you need to start out with at Earth in order to come to rest infinitely far away from Earth (i.e, when you've escaped Earth's gravitational field).
		Escape velocity is that velocity needed to enter an orbital path that is parabolic.(open not closed.) Thus the body "escapes" the vicinity of Earth as its trajectory never will bring it back to the Earth.
	www.physicsforums.com /archive/index.php/t-84148.html (2109 words)

	About Team Escape \| Team Escape Velocity Cycling Club
		Escape Velocity organizes and runs over 25 races per year, including the ever-popular Spring Series training races in March and the Tuesday Nighters at UBC, held every Tuesday night from May to September.
		Escape Velocity has also held the BC Classic Stage Race, an epic event and the largest club-hosted stage race in the history of cycling in BC.
		In addition to hosting races, Escape Velocity team members occupy several executive and board positions within the Burnaby Velodrome, Cycling BC, the Canadian Cycling Association.
	www.escapevelocity.bc.ca /about (253 words)

	Nasaexplores
		When comparing the planets' escape velocity to its mass, there is a gradual increase in a curved line from Pluto to Neptune, followed by a sharper increase from Neptune to Jupiter.
		The escape velocity then declines in relation to distance from the Sun as the curve drops to Jupiter.
		The simplest relationship to a planets escape velocity seems to come from its mass with a gradual increase of the planet's escape velocity with its mass.
	www.nasaexplores.com /show_912_teacher_st.php?id=030109115838 (448 words)

	Black Holes - Relativistic escape velocity
		Since such an extreme velocity would have to be near that of the speed of light the formula for escape velocity must take into account the effects of special relativity.
		Now, what this formula shows is that escape velocity is ultimately derived from a comparison of the amount of potential energy that must be overcome to escape a gravitational field with the kinetic energy an object would possess if it were given a velocity upwards in an attempt to escape that gravitational field.
		However, for fl hole theory to be valid the escape velocity must exceed the speed of light as the mass approaches infinity and/or the distance approaches zero.
	www.jessekirkham.com /blackholes.htm (683 words)

	How to Calculate Escape Velocity - wikiHow
		The object must have greater energy than the planet's gravitational energy to escape, so 1/2 mv^2 = (GMm)/r can be used for the escape velocity as follows: V(escape)= squareroot[(2GM)/r] where "M" is the mass of the earth, "G" is the gravitational constant(6.67x10^-11) and "r" is the radius from the center of the planet(6.38x10^6).
		The escape velocity of Earth comes to about 11.2 kilometers per second from the surface.
		The escape velocity does not at all depend on the mass of the object that is being launched because the mass of this object is reflected in both the potential energy provided by gravity as well as the kinetic energy provided by the movement of this object.
	www.wikihow.com /Calculate-Escape-Velocity (356 words)

	NASA - Escape Velocity: Fun and Games
		Escape velocity (or a rousing game of Red Rover) requires an object to propel itself with enough speed and thrust to break through a barrier.
		Escape velocity is the speed at which an object must travel to break free of a planet or moon's gravitational force and enter orbit.
		Achieving escape velocity is one of the biggest challenges facing space travel.
	www.nasa.gov /audience/foreducators/k-4/features/F_Escape_Velocity.html (598 words)

	Calculate Escape Velocity Activity
		You will calculate the escape velocity for a number of bodies using the MKS system where the units for distance are meters, the units for mass are kilograms, and the units for time are seconds.
		The escape velocity for the Earth is therefore 11.2 kilometers per second.
		This is the velocity that an object (or gas molecule!) needs at the surface of the Earth to be able to overcome the gravitational attraction of the Earth and escape to space.
	nova.stanford.edu /projects/mod-x/ad-escvel.html (445 words)

	Escape Velocity
		Escape velocity is defined as the velocity with which a body must be thrown vertically upwards in order that it may just escape the gravitational pull of earth.
		When we throw a body vertically upwards with certain velocity, the body retuns to the earth's surface after some time.
		However, when the body is thrown with a velocity equal to the escape velocity, the body overcomes the earth's gravitational pull and also the resistance of the earth's atmosphere.
	library.thinkquest.org /03oct/02144/basics/escape.htm (148 words)

	Escape Velocity Nova - MegaGames demos
		Escape Velocity Nova is an impressive and very successful shareware game which has been around for some time on the Mac.
		PC gamers will now have the chance of sampling EVN in order to understand what it is about the Escape Velocity series that has captivated Mac users.
		Nova is the third game in the Escape Velocity series, and is by far the most ambitious installment to date.
	www.megagames.com /news/html/demos/escapevelocitynova.shtml (382 words)

	The Magic Escape Velocity Barrier
		Many people seem to think that escape velocity is some kind of magical barrier around the Earth which cannot be bypassed by anything moving at a velocity smaller than the Magical Escape Velocity.
		The concept of escape velocity is not related to thrust, only to initial velocity (followed by not applying any additional forces to the launched object).
		Also another important thing to understand is that escape velocity depends, naturally, on the distance from which the object is launched with respect to the planet's center.
	warp.povusers.org /grrr/escapevelocity.html (554 words)

	Escape Velocity
		I was wondering- if one were to try to determine the escape velocity of a body off the center of the earth, where the air resistance is proportional to v
		Escape velocity is a concept that depends on the conservation of energy.
		It is that velocity where the kinetic energy equals the negative gravitational potential energy, giving the body a total mechanical energy of zero.
	www.emu.edu.tr /mugp101/MCASCO/qa_ev.html (219 words)

	Escape velocity & reentry quest - Astronomy.com Forums
		There is a minimum velocity needed to escape the Earth's gravity.
		This velocity varies according to the distance between the object and the Earth.
		Theoretically, one can envision a "ladder" that is so high that eventually you could just "step off" in a direction perpendicular to it and achieve escape velocity (remember, the velocity needed to escape is related to the distance between you and the Earth -- the further away you are, the less velocity is needed).
	cs.astronomy.com /asycs/forums/p/28462/354885.aspx (657 words)

	Planetary Science
		The escape velocity is the initial velocity needed to escape a massive body's gravitational influence.
		Since the mass is in the top of the fraction, the escape velocity increases as the mass increases.
		The escape velocity is lower at greater heights above the planet's surface.
	www.astronomynotes.com /solarsys/s3.htm (1151 words)

	escape velocity Text - Physics Forums Library
		The further you are from the Earth, the smaller the escape velocity.
		So if I left the earth in my rocket at escape velocity from the getgo, does that mean by the time I reach the point at infinity, I will have used up all my velocity and will just sit there at infinity with zero velocity and wont ever be sucked back into the earth.
		If I have the right escape velocity to leave earth, does that mean that when I reach the point infinity, will my velocity now be zero, and I can stay at infinity without being pulled back in.
	www.physicsforums.com /archive/index.php/t-40978.html (3054 words)

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