Joined: Mon Jul 23, 2007 2:28 pm Posts: 556 Location: USA
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1helios1 wrote: forgive me if i suggested that we simple call it fake, my comment about it maybe being flat was merely a joke.
actually, your point about having a balance of the rotational speed and the extreme gravity got me to look at the problem again. and it think we made a mistake. the axis of the planet is right beneath us, yes? as though we are standing above the rotational axis of spinning top. our calculations for the escape velocity were for the speed of rotation around the equator. but for any other location we would have to work out the angular velocity, from where we are however, i would think the angular velocity would be zero, or near zero. unfortunately i dont think this helps us, we still cant have an earth like planet spinning at that speed since it would tear itself apart. and we cant have a planet of greater density to compensate for that spinning, because we, on the top of said planet, would not experience that speed. please correct me if i have made a mistake, i am very tired at the moment : )
On the surface of the planet, the speed of rotation would not be felt by us as here on earth, we are moving at 1,000 mph, but as in a car, train, or Jet, we only feel changes in velocity (Delta V), when we accelerate the car or jet, or when we brake, etc.
The speed of rotation will not affect the effect of gravity upon anyone on a planet, as it's the planet's mass that "causes" gravity. If you weigh 180 pounds right now, but then the earth were to suddenly stop rotating, you would still weigh 180 pounds. "Artificial Gravity" on a space station that is spinning, is not the same as the gravity you feel here on earth (or any other planet for that matter). That's centrifuge force that works for a spinning space station.
That's what makes Gravity so neat to me. To have it, you simply need to have mass. To have more gravity, you simply need more mass.
Size maters only when we're talking about what the mass is made of. You can test this yourself. get a piece of wood, and then get some lead fishing weights. Gather enough lead weights so they are about the same size as the piece of wood. You'll notice that the lead feels heavier than the piece of wood. To make the wood feel as heavy as the lead, you'd have to get a much bigger piece of wood. This is because the wood is less dense than the lead.
This works out with planets too: The Earth, Mars, and the Moon are all made out of rocky material (they are not exactly the same, but close enough for what we're talking about). You will find that you weigh less on Mars and the Moon because they are much smaller in size (but of the same material), so they have less mass than Earth. Less mass means less gravitational force is acting upon you.
The main reason we're concerned about Teledahn being earth sized, yet spinning as fast as it would have to, is as 1helios1 said: At what speed can a planet spin, yet still hold itself together? There has to be an upper limit, as too fast and the planet will do some while things: hurricane force winds that are over 1,000 mph (yes, the earth's rotation does affect the weather, as does heating and cooling, and many other things), the tensile strength of the rocky crust, would it be too much for it (spin too fast and the planet will flatten at the poles, take a look at Saturn at is' rotation speed, it has an effect on the planet's shape).
Anyway......where was I? hehehe, got to running off on a tangent, Ha!
I've got to get to work, see you guys later.
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