Earth

lukman · Sep 12, 2007

Inertia, if the earth rotation stop at sudden, yes, but it think we will be thrown sideway, not up. <img src="/images/icons/laugh.gif" /> <div class="Discussion_UserSignature"> </div>

MeteorWayne · Sep 12, 2007

Hence the messy parabola I suggested way back <img src="/images/icons/smile.gif" /> <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

SpeedFreek · Sep 12, 2007

Interesting question, this. The usual question is what would happen if the Earth instantly stopped rotating. The speed at the equator is just over 1000 mph, so if the Earth instantly stopped rotating you would continue on the same trajectory, subject to Earth's gravity. At the equator you would be accelerated from 0 mph to over 1000 mph instantly at a very shallow angle and what was left of you would continue on that parabolic curve until you hit the nearest wall or ground into the ground! People at the poles, on the other hand, wouldn't feel a thing (maybe a little dizziness!). Now, someone mentioned orbital velocity. Would the orbital velocity have any impact on what happened to the people or objects on Earth? Is their motion determined relative only to the Earth itself? Can we even consider the orbital velocity to be relevant as we have to ask the question, velocity relative to what? From what frame of reference could we ever consider the Earth to be suddenly at rest relative to the sun? Let's have a go! So, the Earth orbits the Sun at 67,000 miles per hour, relative to the Sun. From a point of view outside our solar system, some impossible force stops the Earth and holds it in place, while all the other planets carry on along their orbital paths as normal. If the Earth suddenly stops rotating, we feel exactly the same effects as above. If it suddenly stopped moving round the sun, relative to the other planets, what other effects would we feel? Would the instant 67,000 mph deceleration in the direction of orbital motion have any inertial effect? Would the people on the "forward" side all achieve escape velocity and fly upwards into space in a straight line? Would the people on the "rearward" side be squashed into the ground as if they hit it at 67,000 mph? Well, the problem is that the question is flawed, in that it omits a cause from which we can determine an effect. What <div class="Discussion_UserSignature"> _______________________________________________ SpeedFreek </div>

chembuff1982 · Sep 12, 2007

Ifs and maybes never counted for much lol. How about this scenario, an asteroid hits the earth at an angle and speed that temporarily stops the earths rotation. <div class="Discussion_UserSignature"> You may be a genius, but google knows more than you! </div>

MeteorWayne · Sep 12, 2007

An impact large enough to do that would shatter the earth. <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

schmack · Sep 13, 2007

very interesting... cheers speedfreek <div class="Discussion_UserSignature"> Assumption is the mother of all stuff ups Gimme some Schmack Schmack! </div>

b0rt · Sep 14, 2007

Good post Speedfreak. I think however even though the seatbelt comment was made by the OP, I don't think they took into account what your getting into regards to physics or opposing forces to make it stop. I think what the OP meant was more of an act of God sort of thing. We are in phenomena afterall. So let me rephrase the question. What if God decided one day that he wanted the Earth to stop (by no opposing force other than his own will), what would happen? I guess to further that question, what would happen if the Earth stopped spinning on its axis only? What would happen if it stopped orbiting the Sun? What if both stopped at the same time? I think it would be illogical to think that nothing would happen. Chances are everthing both animate and inanimate would just go flying at incredible speeds, probably causing mass extinction. That and even if things did survive, the after effect of it stopping completely would do the same thing. The way I'm picturing it is something like the Earth being a baseball. If it was travelling and all of a sudden stopped (by a bat or whatever) so suddenly, we'd all fly off. It just seems like there is no other answser. However implausible, an interesting question to ponder.

SpeedFreek · Sep 18, 2007

"What if God decided one day that he wanted the Earth to stop (by no opposing force other than his own will), what would happen? I guess to further that question, what would happen if the Earth stopped spinning on its axis only? What would happen if it stopped orbiting the Sun? What if both stopped at the same time?"/i> I refer you to the last paragraph of my post you replied to: "So we end up having to totally suspend the laws of physics for the planet itself, but not the objects upon it, in order to assume that the Earth could simply stop moving and ask what would happen to the motion of the people upon it." What would happen if the Earth stopped spinning on its axis only? As posted by others previously, everyone would continue moving, at the equator at a little over 1000 miles an hour. If they were inside a room, they would smash into a wall at that speed, and if in open air and facing east they would fly forwards at over 1000mph in a shallow parabola governed by gravity, if it still existed, and would either hit something face on, or hit the ground pretty quickly. At the poles, the rotational speed is very slow indeed (you spin 360 degrees once every 24 hours) so I doubt you would feel much at all. What would happen if it stopped orbiting the Sun? What if both stopped at the same time? Imagine instant acceleration from 0 - 67,000 mph! Around dawn, your remains would fly upwards into space at 67,000 mph! Around dusk, you would be crushed into the ground at 67,000 mph as if you hit it at that speed. Or is it the other way round? <img src="/images/icons/smile.gif" /> In the middle of the night or day, your remains would fly off the ground at 67,000 mph at a very shallow angle (either east or west depending what side you are on!) and if they didn't hit anything on the way (i.e <div class="Discussion_UserSignature"> _______________________________________________ SpeedFreek </div>

MeteorWayne · Sep 18, 2007

Nice job speedfreak. You've summarized the effects of both impossible scenarios very eloquently!! Wayne <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

SteveD156 · Jan 15, 2009

Who named this planet (EARTH) and does the word, earth, have any meaning? <div class="Discussion_UserSignature"> SteveD156 </div>

BoJangles · Jan 15, 2009

Earth is Old English and German in origin, related to the Old Saxon 'ertha', the Dutch 'aerde', and the German 'erda'."Men's notions of the shape and position of the earth have so greatly changed since Old Teutonic times, while the language of the older notions has long outlived them, that it is very difficult to arrange the senses and applications of the word in any historical order."  http://curious.astro.cornell.edu/question.php?number=451  I'm sure there is a lot more to this, though I doubt we can ever know the real origins of such words   <div class="Discussion_UserSignature"> -------------- Let me start out with the standard disclaimer ... I am an idiot, I know almost nothing, I haven’t taken calculus, I don’t work for NASA, and I am one-quarter Bulgarian sheep dog. With that out of the way, I have several stupid questions... *** A few months blogging can save a few hours in research *** </div>

crazyeddie · Jan 16, 2009

In a strictly technical sense, our planet is called "Earth" because the International Astronomical Union says so:   "The official names of planets and their moons are governed by an organization called the International Astronomical Union (IAU)... The IAU is the internationally recognized authority for assigning names to celestial bodies and any surface features on them.   The IAU recognizes that astronomy is an old science and many of its names come from long-standing traditions and/or are founded in history. For many of the names of the objects in the solar system, this is especially so. Most of the objects in our solar system received names long ago based on Greek or Roman mythology. The IAU has therefore adopted this tradition in its rules for naming certain types of objects in the solar system... Earth is the only planet whose English name does not derive from Greek/Roman mythology. The name derives from Old English and Germanic. There are, of course, many other names for our planet in other languages."   http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question48.html   The word for 'Earth' is not the same in all of Earth's languages. Here are a few examples:   "Afrikaans: aarde  Danish: verden  Finnish: maa  French: mondiale  German: Erde  Indonesian: dunia  Japanese: tsuchi, yochi, chi, a-su, daichi, koudo  Russian:      Swahili: kiwanja  Swedish: mull"   The Straight Dope Archives: Do other languages call Earth "Earth"? http://www.straightdope.com/mailbag/mearth.html   Here you'll find an interesting table that lists the names of the Sun, the Moon, the Earth, and the other planets of the Solar System in many different languages:   Students for the Exploration and Development of Space: Planetary Linguistics http://www.seds.org/billa/tnp/days.html   "Some other names for 'Earth' are;    Aztec: Coatlicue  Chinese: Hou ji  Danish: Jorden  Dutch: Aarde  Egyptian: Geb  Estonian: Maa  French: Terre  German: Erde  Greek: Gaea  Hebrew: HaOlam  Incan: Pachamama  Italian: Terra  Japanese: Chikyuu  Latin: Terra  Maltese: Dinja  Maori: Papa  Mayan: Bacabs  Norse: Midgard  Norwegian: Jorden  Polish: Ziemia  Portuguese: Terra  Russian: Zemlya  Serbo-Croatian: Zemlja  Slovene: Zemlja  Spanish: Tierra  Sumerian: Enlil  Icelandic: J r<eth>in   The Earth has often been personified as a deity, often a goddess. See Gaea and Mother Earth. In Norse mythology, Earth was the son of Nott and Annar."   Internet Encyclopedia: Earth http://www.internet-encyclopedia.info/wiki.phtml?title=Earth   "earth - O.E. eor e 'ground, soil, dry land,' also used (along with middangeard) for 'the (material) world' (as opposed to the heavens or the underworld), from P.Gmc. *ertho (cf. O.N. j r , M.Du. eerde, O.H.G. erda, Goth. air a), from PIE base *er-. The earth considered as a planet was so called from c.1400. Earthy in the fig. sense of 'coarse, unrefined' is from 1594. Earthworm first attested 1591. Earthwork is from 1633. Earthlight apparently coined 1833 by British astronomer John Herschel."   Online Etymology Dictionary http://www.etymonline.com/e1etym.htm   "The name of our planet is the Earth. The name of our moon is the Moon. The name of our solar system is the Solar System.   Notice that I capitalize them, because when used as names, they are proper nouns. This also helps us distinguish between the planet Earth and earth (meaning soil), between the Earth's Moon and moon (meaning the natural satellite of a planet), and between our Solar System and any other solar systems (since any system containing a star and a planet or a planet-forming disk can be called a solar system.)   This is the usage approved by the International Astronomical Union, the body in charge of naming celestial objects... You may read or hear people using Luna for the Moon, or Terra or Gaia for the Earth, or Sol for the Sun, but these are poetic terms, often seen in science fiction stories, but not used by astronomers in scientific writing."  http://answers.google.com/answers/threadview?id=269452 <div class="Discussion_UserSignature"> </div>

MeteorWayne · Jan 16, 2009

Thanx, ce, very informative!! <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

MeteorWayne · Jan 16, 2009

Replying to: <DIV CLASS='Discussion_PostQuote'>Who named this planet (EARTH) and does the word, earth, have any meaning? Posted by SteveD156</DIV> Good Question, thanx!And welcome to Space.com. <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

SteveD156 · Jan 20, 2009

If I'ts OK with all of you, can I just get short answers. I'm not as smart as you guys and a short answer gives me a better understanding. Thank You Very Much.  <div class="Discussion_UserSignature"> SteveD156 </div>

BoJangles · Jan 20, 2009

As you wishWho named earth? nobody knows.Does it have a meaning? yes the thing you stand on

<div class="Discussion_UserSignature"> -------------- Let me start out with the standard disclaimer ... I am an idiot, I know almost nothing, I haven’t taken calculus, I don’t work for NASA, and I am one-quarter Bulgarian sheep dog. With that out of the way, I have several stupid questions... *** A few months blogging can save a few hours in research *** </div>

MeteorWayne · Jan 20, 2009

Replying to: <DIV CLASS='Discussion_PostQuote'>If I'ts OK with all of you, can I just get short answers. I'm not as smart as you guys and a short answer gives me a better understanding. Thank You Very Much.  Posted by SteveD156</DIV> LOL, that's not easy for us to do. We like to be thorough. Besides, other people are most likely curious about the answer to your interesting question. Just read a few sentences at a time if that helps <img src="http://sitelife.space.com/ver1.0/content/scripts/tinymce/plugins/emotions/images/smiley-laughing.gif" border="0" alt="Laughing" title="Laughing" /> <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

SteveD156 · Jan 30, 2009

Okee Doekee, LOL,  Thank you for all of your answers. Oh and I was talking about the meaning of the WORD not the planet I stand on. But ya'll sound pretty cool. thanks again for your answers. <div class="Discussion_UserSignature"> SteveD156 </div>

drwayne · Jan 31, 2009

Sounds like homework to me.

Wayne <div class="Discussion_UserSignature"> "1) Give no quarter; 2) Take no prisoners; 3) Sink everything." Admiral Jackie Fisher </div>

MeteorWayne · Jan 31, 2009

Replying to: <DIV CLASS='Discussion_PostQuote'>Okee Doekee, LOL,  Thank you for all of your answers. Oh and I was talking about the meaning of the WORD not the planet I stand on. But ya'll sound pretty cool. thanks again for your answers. Posted by SteveD156</DIV> If all you are looking for is the definition of a word, a dictionary is the place to go! <img src="http://sitelife.space.com/ver1.0/content/scripts/tinymce/plugins/emotions/images/smiley-surprised.gif" border="0" alt="Surprised" title="Surprised" /> <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

SteveD156 · Jan 31, 2009

Maybe I was wrong about ya'll being cool, Looks like to me all of you people could be a little more friendly!  (MODERATOR) <div class="Discussion_UserSignature"> SteveD156 </div>

MeteorWayne · Jan 31, 2009

Replying to: <DIV CLASS='Discussion_PostQuote'>Maybe I was wrong about ya'll being cool, Looks like to me all of you people could be a little more friendly!  (MODERATOR) Posted by SteveD156</DIV> Balony! <img src="http://sitelife.space.com/ver1.0/content/scripts/tinymce/plugins/emotions/images/smiley-smile.gif" border="0" alt="Smile" title="Smile" /> You got a very detailed answer to the first part of your question (far more detailed than you would have gotten anywhere else), which you complained about being TOO detailed. The second part of your question, is a dictionary one, as I said. What else do you want?If you ask questions and complain about the answers, which a number of members have spent a considerable amount of time investigating, I don't know how we could be more accomodating.Sheesh!!And BTW, my name is Meteor Wayne (Wayne will do just fine), when I am speaking as a moderator I will make that clear. <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

drwayne · Feb 1, 2009

Some people appear in a forum with a remarkable sense of entitlement, don't they?People who answer your questions in a forum are complete strangers who are giving you the benefit of their time, information and intelligence for free.  They owe you absoulely nothing.  Keep that in mind.Wayne <div class="Discussion_UserSignature"> "1) Give no quarter; 2) Take no prisoners; 3) Sink everything." Admiral Jackie Fisher </div>

SteveD156 · Feb 14, 2009

OK, Sorry, Having a bad Year, all 365 and 1/4's worth. something I've got to work out.     Again Sorry. <div class="Discussion_UserSignature"> SteveD156 </div>

MeteorWayne · Feb 14, 2009

SteveD156:Mod Hat On***Steve, I have deleted your post with the profanity. Please do not repeat it.ThanxWayne <div class="Discussion_UserSignature"> But the Krell forgot one thing John. Monsters. Monsters from the Id. I really, really, really, really miss the "first unread post" function </div>

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