Cuda416
Well-Known Member
And in this case, where the earth stops instantly, then the effect on "flinging you forward" is instant, which is instant acceleration, or as close as you're going to get. So, no, 1000 Mph is not enough, right?
serious question about the world
- Thread starter diymirage
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And in this case, where the earth stops instantly, then the effect on "flinging you forward" is instant, which is instant acceleration, or as close as you're going to get. So, no, 1000 Mph is not enough, right?
Really? Im confused.
Maybe this will help.
Maybe this will help.
LovetheA's
Well-Known Member
That is true no rocket leaves the launching pad at 25,000 mph but it does accelerate as it is moving away from the earth. As the atmosphere deminishes and the vacuum of space is reached there is no air resistance then you just need sufficient speed and acceleration to escape gravity. For example the space shuttle when positioned strategically around the earth and circumnavigating it can travel around the entire earth in 90 minutes. Id say that is damn fast probably up there around 18,000 mph or faster. Keep in mind that shuttle is still being held a set distance from the earth in an orbit. In other words gravity still has minimal hold. Food for thought. I’m in awe of the miracles and mysteries of space and astronomy.
Cuda416
Well-Known Member
I did not say they did, it takes a speed of 25,000 Mph to escape the gravitational pull, not get into space. The shuttle, or any object in space, has to maintain a speed of around 17,500 Mph to reach equilibrium at the altitude it goes. Any faster and it flys further out, and slower and it starts falling. Go 25,000 and some change, and you're going bye bye....
LovetheA's
Well-Known Member
Cuda416
That totally makes sense based on what I had stated.
That totally makes sense based on what I had stated.
LovetheA's
Well-Known Member
Seriously thought how in the hell do I get my headlights to work on my space ship when I’m traveling just near the speed of light? I’m flying blind out here!
Cuda416
Well-Known Member
While you're twiddling around with your carb going almost as fast as light, I'll just step through this wormhole and see you when you get there.
Ddaddy
I'm changing the World... one pixel at a time!
It is not enough to completely escape gravity which is why I said it would eventually pull you back down. However, it is enough to fling you 60 kilometers off the planet which is well past the edge of the stratosphere.
Treblig
Well-Known Member
I see a Kerrrr- Spat coming??????????/
Cuda416
Well-Known Member
Nah, if the earth stopped instantaneously, the millions of ensuing tornadoes would catch you and toss you from tornado to tornado like a pin-ball game
Ddaddy
I'm changing the World... one pixel at a time!
TILT!Nah, if the earth stopped instantaneously, the millions of ensuing tornadoes would catch you and toss you from tornado to tornado like a pin-ball game
Game over.
Cuda416
Well-Known Member
The edge of space is around 62 miles, or 100 km
Treblig
Well-Known Member
Yes but where do the effects of earth's gravity end???????
treblig ( The "drunk" Science Guy))
Cuda416
Well-Known Member
That's a really interesting question, and not being a physicist, I'm just going to guess and say the effects themselves will reach on forever, it's to what degree the effects are felt would be the more appropriate question.
Ddaddy
I'm changing the World... one pixel at a time!
It extends as far away in light-years as the earth is old. And farther, if you include the various things that eventually coalesced into the earth.
So the earth’s gravitational field is approximately a sphere about 4.5 billion light-years in radius.
Treblig
Well-Known Member
Well............... you were close......The distance at which Earth's gravity is "zero" is dependent on the mass of the object that is trying to free itself from Earth's gravitational force. The greater the mass the further away the object must be. So, something "light" like a feather doesn't need to be nearly as far as something that weighs millions of tons.
Of course we're NOT taking into account the "orbiting" speed, which changes the equation completely!!!
Newton's Law of Universal Gravitation
It's all relative!!!!!!!!!
treblig (The Science Guy)
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Cuda416
Well-Known Member
you're assuming gravity is limited by the speed of light.
I was not postulating how far away something could be to not fall back to earth, just that the effects are felt to the edge of the universe. Gravity is a force, without mass, so even though earth is 4.5 Bn years old, the gravitational effects would be theoretically measured, infinitesimally, out at the edge. Other objects with greater mass would mitigate some of the effects but the force itself, would be felt way farther than is measurable to us.
Ddaddy
I'm changing the World... one pixel at a time!
The gravitational force of an object can only be in existence for as long as the object has been in existence.
Albert Einstein's special theory of relativity shows that the speed of gravity cannot exceed the speed of light.
Cuda416
Well-Known Member
I wasn't saying the time of existence, I was suggesting the distance at which it is felt. The two are very different concepts.
You got me on this, and as such, my distance idea doesn't hold.
BigBlockMopar
BigBlockMember
You would have to define 'felt' or feel. Felt by what? How large is (how much mass has the) object/observation point that 'feels' the gravity (mass) of the other object?
Does the object or observation point itself have mass, and therefore create its own gravity(-well)?
Without mass there's no gravity.
Gravity's curve is a parabolic curve, the further you get from the center of the gravity-source, the less it becomes (measurably/felt).
Does the object or observation point itself have mass, and therefore create its own gravity(-well)?
Without mass there's no gravity.
Gravity's curve is a parabolic curve, the further you get from the center of the gravity-source, the less it becomes (measurably/felt).
Cuda416
Well-Known Member
My thoughts were about how far the gravity of earth would be felt, no matter how infinitesimal in degree. It seemed that since gravity is a force, then speed would not affect it. That's wrong though since gravity is a waveform and matches the speed of light. So, as stated, it could only be theoretically felt, around 4.5Bn light years away at most.
diymirage
HP@idle > hondaHP@redline
Oh, I'm still around...and very impressed...especially with the princess bride reference
Treblig
Well-Known Member
If you got that far away there would be no way to "report" your finding because it would take 4.5 billion years for the data to get back to earth????/ We would all be dead if the sun had not supernova-ed by then???Treblig (The Science Guy)
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