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    maxwellhunt's Avatar
    maxwellhunt Posts: 3, Reputation: 1
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    #1

    Mar 1, 2007, 05:38 PM
    Speed of the earth's rotation
    At what speed does the earth revolve around the sun
    saturday's Avatar
    saturday Posts: 15, Reputation: 1
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    #2

    Mar 1, 2007, 05:44 PM
    30 kilometers per second
    TechSupport's Avatar
    TechSupport Posts: 43, Reputation: 5
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    #3

    May 3, 2007, 11:23 AM
    More info about the earth's rotational speed at Speed of the Earth's Rotation
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #4

    May 22, 2007, 05:34 PM
    1 RPY(Revolution per year(Earth)). At the bottom end of the dial. It spins about 365 times during that time
    Starman's Avatar
    Starman Posts: 1,308, Reputation: 135
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    #5

    May 23, 2007, 07:43 PM
    Approximately 65,000 mph or (105,000 kph), which is approx. 18 1/2 miles a second.
    One thing to remember is that Earth's orbit is slightly elliptical which causes it to accelerate as it gets closer to the Sun and decelerate gradually as it moves away giving it an average speed of 29.658 km/s. In short, its fastest when closest to the Sun--perihelion--and slowest when farthest from the Sun--aphelion.


    Speed of the Earth in Orbit
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #6

    May 23, 2007, 10:29 PM
    Errrm, starman did you just use commas in 2 different ways here?
    Starman's Avatar
    Starman Posts: 1,308, Reputation: 135
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    #7

    May 24, 2007, 03:47 AM
    Quote Originally Posted by Capuchin
    Errrm, starman did you just use commas in 2 different ways here?
    Average speed of 29.658 km/s

    Thanks for pointing out the typo.
    lew lew 12345's Avatar
    lew lew 12345 Posts: 1, Reputation: 0
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    #8

    Jun 25, 2007, 07:00 AM
    Quote Originally Posted by maxwellhunt
    at what speed does the earth revolve around the sun
    6000mph
    Skrypt's Avatar
    Skrypt Posts: 156, Reputation: 25
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    #9

    Jul 15, 2007, 07:13 PM
    HOLY CRAP. That means if somehow by freak force of nature that the earth slowed down everything would fly around.
    TechSupport's Avatar
    TechSupport Posts: 43, Reputation: 5
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    #10

    Jul 16, 2007, 06:46 AM
    Quote Originally Posted by Skrypt
    HOLY CRAP. that means if somehow by freak force of nature that the earth slowed down everything would fly around.
    This is not true. The Earth, unlike any spinning object you can possibly hold and touch, has an immense gravitational field. It is not centripetal force that holds you to the surface of the earth, it is gravity.

    The Earth's gravity is is pulling you towards it at the rate of 9.8 meters per second per second. If it slowed down to no spin whatsoever, there would still be gravity. It is dependent solely on the mass of two objects (you and the earth) and the distance between them. The closer the distance, and/or the larger the mass, the greater the gravitational force between the two.

    Check out Earth's Mass - EnchantedLearning.com for more information about figuring out gravity equations.
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #11

    Jul 16, 2007, 08:53 AM
    Quote Originally Posted by TechSupport
    This is not true. The Earth, unlike any spinning object you can possibly hold and touch, has an immense gravitational field. It is not centripetal force that holds you to the surface of the earth, it is gravity.

    The Earth's gravity is is pulling you towards it at the rate of 9.8 meters per second per second. If it slowed down to no spin whatsoever, there would still be gravity. It is dependent solely on the mass of two objects (you and the earth) and the distance between them. The closer the distance, and/or the larger the mass, the greater the gravitational force between the two.

    Check out Earth's Mass - EnchantedLearning.com for more information about figuring out gravity equations.
    Actually, the Earth would have to spin FASTER to through you off, not the other way around as skrypt says. Centripetal force is required to make something move in a circle, gravity provides this force. Gravity is constant, so if the Earth spins so fast that you need 9.8m/s/s of centripetal acceleration, there's no gravity left to attract you towards the Earth, you'd be effectively in orbit at ground level.
    Starman's Avatar
    Starman Posts: 1,308, Reputation: 135
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    #12

    Jul 26, 2007, 09:34 PM
    Orbit is impossible without gravity.


    Orbit - Wikipedia, the free encyclopedia

    Centripetal force - Wikipedia, the free encyclopedia
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #13

    Jul 26, 2007, 10:12 PM
    I didn't say there was no gravity...
    TechSupport's Avatar
    TechSupport Posts: 43, Reputation: 5
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    #14

    Jul 27, 2007, 05:42 AM
    Okay, I think the question has been answered. The rest of this conversation is answering a much different question (or set of questions).
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #15

    Jul 27, 2007, 05:46 AM
    But equally intriguing :)
    TechSupport's Avatar
    TechSupport Posts: 43, Reputation: 5
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    #16

    Jul 27, 2007, 06:14 AM
    Astromechanics is my favorite topic. I'd love to take over the world and discuss nothing more than gravitational tides and retrograde motion due to inertial displacement from angular momentum, but I have to earn a living. :)
    Starman's Avatar
    Starman Posts: 1,308, Reputation: 135
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    #17

    Jul 27, 2007, 02:47 PM
    Quote Originally Posted by Capuchin
    I didn't say there was no gravity....
    What did you mean by no gravity and being in orbit then?

    quote

    So if the Earth spins so fast that you need 9.8m/s/s of centripetal acceleration, there's no gravity left to attract you towards the Earth, you'd be effectively in orbit at ground level.
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #18

    Jul 27, 2007, 03:49 PM
    I meant that gravity would be providing the centripetal acceleration needed for circular motion i.e. orbit. You would be in freefall at ground level.

    I see that what I did say was ambiguous, I apologise.
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