Question
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Mar 1, 2007, 03:38 PM
| | New Member  | | Join Date: Mar 2007
Posts: 3
| | | speed of the earth's rotation
at what speed does the earth revolve around the sun
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Answers
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Jul 16, 2007, 07:53 AM
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#11
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Join Date: Oct 2006 Location: UK
Posts: 4,729
| 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 requred 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. |
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Jul 26, 2007, 08:34 PM
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#12
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Join Date: Jun 2003 Location: USA
Posts: 1,352
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Jul 26, 2007, 09:12 PM
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#13
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Join Date: Oct 2006 Location: UK
Posts: 4,729
| I didn't say there was no gravity.... | |
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Jul 27, 2007, 04:42 AM
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#14
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Join Date: Jan 2007 Location: Rochester, NY
Posts: 32
Pay to call TechSupport for advice ($0.00/min) | Okay, I think the question has been answered. The rest of this conversation is answering a much different question (or set of questions). | |
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Jul 27, 2007, 04:46 AM
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#15
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Join Date: Oct 2006 Location: UK
Posts: 4,729
| But equally intriguing  | |
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Jul 27, 2007, 05:14 AM
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#16
| | Junior Member
Join Date: Jan 2007 Location: Rochester, NY
Posts: 32
Pay to call TechSupport for advice ($0.00/min) | 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. | |
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Jul 27, 2007, 01:47 PM
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#17
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Join Date: Jun 2003 Location: USA
Posts: 1,352
| 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. | |
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Jul 27, 2007, 02:49 PM
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#18
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Join Date: Oct 2006 Location: UK
Posts: 4,729
| 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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