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Neon
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The Earth's escape velocity is in km per s. But i can jump off the ground! i know but the estimate for the Earth's escape velocity in for an object of what mass? Defintely more than a ton.
But you're not escaping. You'll come right back down.Neon said:But i can jump off the ground!
The only thing pulling you back down is the Earth's gravity. So if that gravity "disappeared" you would keep going. (Not a particularly realistic scenario. What's your point?)Neon said:if i jumped and the Earth gravity disappear or i have that force constantly pushing me up with a typical jump force, i will be in space right?
To jump off the ground, you just need a net upward force. Easily achievable. So what?Neon said:Technically I used enough force to oppose the Earth's gravity and go the opposite direction.
References for what?Neon said:So... any referances?
Neon said:The Earth's escape velocity is in km per s. But i can jump off the ground!
Neon said:if i jumped and the Earth gravity disappear
Neon said:or i have that force constantly pushing me up with a typical jump force, i will be in space right?
Neon said:The Earth's escape velocity is in km per s. But i can jump off the ground! i know but the estimate for the Earth's escape velocity in for an object of what mass?
Ok i get the escape to infinity part so instantly accelerate to the speed and stop WILL escape Earth right?PeterDonis said:"Escape velocity" doesn't mean "the speed you need to be able to jump up from the ground". It means "the speed you need to be able to escape to infinity, starting from the Earth's surface, with no further force applied"
What about the area where the gravity reaches out that is significant enough to be measure? like the hill sphere of Earth and black hole are vastly different. So outside the event horizon would be and low in escape velocity as I need to move through less of its gravity.Nugatory said:Shoot a gun straight up. If the bullet will eventually fall back to the earth, then the muzzle velocity of the bullet was less than escape velocity. If the bullet never falls back, then the muzzle velocity was greater than or equal to escape velocity. The mass of the bullet doesn't matter, just the speed (although it will of course take a more powerful to gun to fire a heavier bullet at the same speed).
In practice, no traditional gun is capable of firing bullets at speeds greater than escape velocity, which is why we use rockets to launch spacecraft instead.
I am asking if the Earth's gravity gets weaker faster, would escape be easier?Neon said:What about the area where the gravity reaches out that is significant enough to be measure? like the hill sphere of Earth and black hole are vastly different. So outside the event horizon would be and low in escape velocity as I need to move through less of its gravity.
Neon said:I am asking if the Earth's gravity gets weaker faster, would escape be easier?
Neon said:I am asking if the Earth's gravity gets weaker faster
Earth's escape velocity is calculated using the formula v = √(2GM/R), where G is the gravitational constant, M is the mass of Earth, and R is the radius of Earth.
Earth's escape velocity is the minimum speed that an object needs to reach in order to escape Earth's gravitational pull. This is important for understanding space travel and the ability for objects to leave Earth's atmosphere.
Earth's escape velocity is relatively high compared to other planets in our solar system. It is second only to Jupiter, which has a much larger mass and therefore a higher escape velocity.
Earth's escape velocity can change depending on the mass and radius of the planet. It can also be affected by the presence of other celestial bodies, such as the Moon, which can slightly alter Earth's gravity.
No, Earth's escape velocity varies slightly at different points on the planet due to differences in elevation and the distribution of mass. However, these variations are very small and do not significantly affect the overall escape velocity of Earth.