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The speed or velocity an object needs to escape from the gravitational field of a planet is called "Escape Velocity" In other words, the amount of kinetic energy needed to overcome the gravitational field. The expression is given in
1/2mv^2 - GMm/r (m= mass of object trying to overcome gravitational field)
M(mass of the planet)
V(Escape Velocity)
G(universal constant which = 6.67E-11)
r(distance from surface of planet or w/e)
when you derive that formula, you will find that the velocity needed is: V= *square root of: 2GM/r
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoIn physics, escape velocity is the speed where the kinetic energy of an object is equal to the magnitude of its gravitational potential energy.
This relates to the speed, or how fast you must travel, in which an object must achieve to "break" free of any gravitational pull.
* Sun - 617.7 km/s - 55 x that of Earth
* Mercury - 4.25 km/s
* Venus - 10.46 km/s
* Earth - 11.186 km/s * Moon - 2.38 km/s
* Mars - 5.027 km/s
* Jupiter - 59.5 km/s
* Saturn - 35.5 km/s
* Uranus - 21.3 km/s
* Neptune - 23.5 km/s
* Pluto - 1.27 km/s
* Ceres - 0.51 km/s To escape the solar system - ~ 1,000 km/s
Wiki User
∙ 10y agoAn object thrown into the air comes back down, according to the old saying. But if the the speed is large enough it will never come back.
That's called the "escape velocity".
The escape velocity sets the boundary of those two scenarios.
An object thrown at the escape velocity (about 7 miles/second for the Earth) will theoretically reach zero speed at infinite distance (assuming all the other factors like the Sun etc. were not present).
The escape velocity for the Sun's gravity is higher, about 380 miles/second for an object at the Sun's surface.
It's about 27 miles/second for an object at the Earth's orbit distance from the Sun.
The concept of "escape velocity" is usually to do with escape from the planet not from its orbit.
Wiki User
∙ 14y agoIt's called Escape Velocity and on Earth it is 11.2km/s
Taken from: http://en.wikipedia.org/wiki/Escape_velocity#List_of_escape_velocities
Wiki User
∙ 11y agoNearly the Speed Of Light.
Wiki User
∙ 13y agoThe speed is called escape velocity.
Wiki User
∙ 11y agoThe speed of light should do it.
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Would a spacecraft need as much fuel to escape from the moons gravity as it would to escape from the earths?
Escape velocity for the moon is a little over 5000 miles per hour. For the earth it is about 25,000 miles per hour. So the moon requires a fifth of the energy required to escape the earth.
Why does a space shuttle need to travel so fast when entering earths atmosphere?
Although it reaches incredible speeds, a Space Shuttle is not going fast when it enters the atmosphere. The gravitational pull of Earth, or just gravity, are pulling down on the space shuttle with immense force.
How fast does a space shuttle need to be traveling when it leaves the earths atmosphere?
It has to travel at least 17,000MPH.
Force required to break from Earths atmosphere?
To be able to escape earth's atmosphere you need to achieve a velocity that is great enough to achieve sufficient energy to escape the earth's gravitational field strength.
What kind of force is needed to launch rocket ships?
to break off from earths gravity they need to reach speed of 11.2 kilometers per second
How fast does something need to be to escape the gravity of a black hole?
In order to escape the gravity of a black hole, an object would have to travel faster than the speed of light - something that is impossible.
Would a spacecraft need as much fuel to escape from the moons gravity as it would to escape from the earths?
Escape velocity for the moon is a little over 5000 miles per hour. For the earth it is about 25,000 miles per hour. So the moon requires a fifth of the energy required to escape the earth.
What is the speed maintained by a rocket if it is launced in outer space so it will escape the earth's gravity?
According to most sources, the minimum speed needed to escape the Earth's gravity is 11.2km/s, so a rocket would need to travel at least this fast to get into outer space.
Why do rabbits need to run fast?
They need to run fast so they can out-run and escape predators.
Why do seahorses have streamlined body?
to escape from its predator so it need to swim very fast to escape from them or to swim fast to catch preys :-)
Why does a space shuttle need to travel so fast when entering earths atmosphere?
Although it reaches incredible speeds, a Space Shuttle is not going fast when it enters the atmosphere. The gravitational pull of Earth, or just gravity, are pulling down on the space shuttle with immense force.
What forces need to be overcome to get to the moon?
If you want to get out of the earth, say for example you want to get to the moon, then you will need to escape gravity.
How does gravity affect an object in motion?
it pulls the object towards the earth which kind of slows it down i guess. or is that friction? For an object travelling in the Earths atmosphere, or near to the Earth above the atmosphere, gravity provides a force pulling the object towards the centre of the Earth. Unless the object is travelling fast enough, what is called the escape velocity, this gravity force will ultimately cause the object to fall back to the surface. Friction is something else, the friction with the air in the atmosphere also slows the object, but this force acts in opposition to the direction of motion, not towards the Earths centre. To compute the trajectory of the object you need to take both forces into account.
Why does a rocket need such a big engine?
So that it can escape Earth's Gravity. The rockets work by burning so much fuel that they can overpower Earth's gravity.
Is the pull of earths gravity 3 times stronger then earth?
need to re-word that question... makes no sense
How fast does a space shuttle need to be traveling when it leaves the earths atmosphere?
It has to travel at least 17,000MPH.
How much thrust is needed to escape earths gravity if something weighs 1520 pounds?
The general idea is that the escape velocity from Earth is 11.2 km/second. This assumes there is no atmosphere. I guess "thrust" would be expressed in units of force; the force can be just about anything, from just slightly bit more than the object's weight (to counter Earth's gravity), to a lot more, depending how long the force is applied. In other words, if you apply more force, you need to apply the force for less time to achieve escape velocity.
