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I found this somewhere, and I was wondering if it was right:
Escape Velocity: The minimum speed needed to exit the gravitational pull of a planet.
Of course, the other definition is: Escape Velocity: Sweet game from Ambrosia Software.
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Quote
Originally posted by Jimbob: Escape Velocity: The minimum speed needed to exit the gravitational pull of a planet.
That is indeed the astronomical definition of "escape velocity."
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Yeah, that's what I thought. The last one is the one I usually go by.
Nope. Sorry to break it to you, but that's the wrong form, AND the wrong term.
First of all, "escape velocity" is a verb. I mean, look at that sentance: --- (QUOTE) Escape Velocity: The minimum speed needed to exit the gravitational pull of a planet. (/QUOTE --- Even Spacey could tell you that's bad grammer (j/k, Space).
For another thing, it's not "Escape Velocity," it's "Terminal Velocity." Apparently, Matt and Andrew just used "Escape" instead of "Terminal" because there was already another great game out called "Terminal Velocity."
Lastly, it's not "escaping a planets gravitational pull," its the velocity needed to escape the atmosphere. This might sound like the same thing, but it's not. Let me put it in "EV" terms- Escaping Terminal Velocity (it is captilized, BTW) in EV is like clicking "leave" on the planet menu. It's totaly different from the little "Couldn't initiate hyperspace jump- not far enough away from system center" popup.
I'm pretty sure that everything listed here is true, but I'm not sure. Feel free to fix, fornote, or flame anything listed here.
Er, first, Escape Velocity is a noun. As in, "Escape Velocity is the speed that must be atained to break free from a planet's gravitational pull," or, "Escape Velocity is the best game ever made." It's the subject of the sentence, so, it's a noun.
Originally posted by Cyber-Dragon: For another thing, it's not "Escape Velocity," it's "Terminal Velocity." Apparently, Matt and Andrew just used "Escape" instead of "Terminal" because there was already another great game out called "Terminal Velocity."
No, Escape Velocity is the speed necessary to escape the gravitational pull. Terminal Velocity has to do with how fast an object must hit the ground to be broken or killed, or something along those lines.
Originally posted by Cyber-Dragon: Lastly, it's not "escaping a planets gravitational pull," its the velocity needed to escape the atmosphere.
Nope, it's gravity.
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Funny how my books all list it as escape velocity. Anyway, it is the velocity required to escape the gravitational pull of a planet in that after ataining said speed you won't come back down. That is what is meant by escaping the gravitational pull. And I dare anyone to disagree with me
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Originally posted by spl_cadet: **Funny how my books all list it as escape velocity. Anyway, it is the velocity required to escape the gravitational pull of a planet in that after ataining said speed you won't come back down. That is what is meant by escaping the gravitational pull. And I dare anyone to disagree with me
**
YOU ARE ALL WRONG!
Escape Velocity is the minimum speed an object must attain to escape the orbit of a celestial body.
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(This message has been edited by General Rak (edited 11-12-2001).)
Right I believe Rak is correct, and I believe terminal velocity is the maximum speed possible for an object to reach from acceleration due to gravity. If I were Ambrosia, I would have picked the name escape velocity just because it sounds cool.
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Originally posted by General Rak: **YOU ARE ALL WRONG!
It is a noun.**
Same damn thing. Besides, what about an unstable orbit? It could be argued that a ball thrown up in the air that comes back down achieved a highly unstable orbit which failed to complete one rotation, thus making the throwing speed escape velocity.
Since I appear to be the only one to have actually gone and looked it up, as opposed to trying to remember it off of the top of my head, my opinion is more important than all of yours'
According to the American Heritage Dictionary, 4th Edition: escape velocity (n.) - The minimum velocity that a body must attain to escape a gravitational field completely.
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Originally posted by Cyber-Dragon: For another thing, it's not "Escape Velocity," it's "Terminal Velocity."
Since I don't trust myself to get it right, I'll think I'll use the dictionary again.
terminal velocity (n.) - the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity
becides that i have the same book "American Heritage Dictionary, 4th Edition" And this is what it states: The minimum velocity that a body must attain to escape a gravitational field completely.
Becides for that I'm pritty sure that its ilock time.
Jager
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I thought Gravity would make more sense. Atmospheres strech endlessely. I mean, Space Shuttles only orbit in the lower part of the thermosphere. I know reaching the thermosphere isn't acheiving "escape velocity" but the thermosphere streches beyond the gravity of Earth. Orbit is when object a is being affected by object b's gravitational pull, making object a circle object b.
yes thats right. I wonder if its ilock time. mabe (sp? too tired)...
Tecnically it is impossible to achieve either definition as an atmosphere, although extremely faintly, extends forever, so does gravity. That said, I vote we go form a mob and destroy whomever made these definitions.
Originally posted by spl_cadet: **an atmosphere, although extremely faintly, extends forever **
If that were true, then an atomic vacuum could not exist... think again. An atmosphere extends as far as it can be held into orbit by a planetary pull.
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Right. Gravity doesn't last forever, either.
This may or may not help in this arguement:
Webster's II - New Riverside University Dictionary: Escape Velocity - noun - The minimum velocity that a body must attain to overcome the gravitational attraction of another body.
American Heritage Dictonary - Standered Edition: The minimum velocity that a body must attain to overcome the gravitational attraction of another body, such as the earth.
That may not help but who cares.
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Here's what Britannica's dictionary says: **Main Entry: escape velocity Function: noun Date: 1934 : the minimum velocity that a moving body (as a rocket) must have to escape from the gravitational field of a celestial body (as the earth) and move outward into space **
So, in other words, Rak was right.
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Originally posted by Jimbob: **Right. Gravity doesn't last forever, either. **
Gravity is the force of attraction between two bodies. The attraction is always there, but it is so minute that it doesn't make a whole lot of difference.