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How can rockets escape from gravity?

Updated: 8/11/2023
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12y ago

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Escape velocity is defined to be the minimum velocity an object must have in order to escape the gravitational field of the earth, that is, escape the earth without ever falling back.

From the surface of the Earth, escape velocity (ignoring air friction) is about 7 miles per second, (11.2 km/sec) or about 25,000 miles per hour. Given that initial speed, an object needs no additional force applied to completely escape Earth's gravity.

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11y ago
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12y ago

Escape velocity is the velocity needed to escape the gravitational pull of a body. The escape velocity of the Earth is about 7 miles per second. The escape velocity of the Sun is about 25 miles per second.

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12y ago

The ev of the Moon is 2.38 km/s compared to the Earths 11.186 km/s
2.4 km (1.5 miles) per second.

Compare with 11.2 km (7.0 miles) per second from earth.
Escape velocity from the Moon is: 2.38 km/s Escape velocity from the Earth (to get to the Moon) is: 11.2 km/s

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14y ago

As we throw a stone vertically up it will go to certain height and fall back towards the earth. This is because the kinetic energy given to the stone gets changed into gravitational potential energy as it moves away from the centre of the earth. As the given energy is not enough to escape it falls back. So if we provide a velocity such that its PE becomes zero as it moves away from the surface then the stone will never come back. It will be out of the gravitational pull of the earth. Such a minimum velocity provided on the surface vertically upward so as to escape from the pull is defined as escape velocity. We can derive the same as Ve = ./ 2gR. Here g is the acceleration due to gravity and R is mean radius of the earth. If we calculate it will be 11.2 km/s. So if we throw a stone with this speed vertically up it will certainly escape.

But in case of rockets it is not advisable to send it at this speed. Because with this speed due to the friction with the air, enormous heat will be produced and the rocket will get burnt totally. Practically there will be multistage of rockets. First one will give the necessary lift to a certain height and the second would give the next push by increasing the speed and third if so would give the needed speed at that height so as to escape and go in a desired direction.

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12y ago

If you imagine a spaceship from your favorite cartoon, you can watch it take off into the sky but the rocket needs to be moving very fast. This is because the rocket needs to reach escape velocity or the velocity is takes to get away from a gravitational field. The speed needed to escape Earth is about 11.2 km/s (that's kilometers per second).

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10y ago

It's a sort of limiting speed. If you throw anything up from Earth at a speed of less than 11.2 km/sec, it will fall back to Earth. If you throw it up at a greater speed, it will escape (hence the name) from Earth, and not come back.

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14y ago

The escape velocity is different for different planets, stars, or other objects. In the case of planet Earth, the escape velocity is 11.2 km/sec.

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16y ago

A rocket needs to travel at 25 000 mph to reach low-earth orbit.

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12y ago

the rocket's thrusters, or "rockets" have more force than the force of gravity allowing them to escape the force of gravity

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13y ago

The escape velocity of Pluto is 1.229 kilometers per second.

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Related questions

To reach outer space rockets must escape what force?

gravity


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.


How does a rocket make enough thrust to escape earths gravity?

Today's rockets use chemical fuel for this. That is, they burn something.


What may happen to a rocket which rises from the earth never attains escape velocity?

A rocket that doesn't reach "escape velocity" will be overcome by gravity and will be pulled back down to Earth. Also, rockets which go into orbit have not reached escape velocity. Escape velocity is what is needed to completely leave earth's gravity well.


How does the center of gravity affect rockets?

The center of gravity affects the rockets flight by being gay.


Why do rockets use thrust?

Rockets use thrust to overcome the force of Earth's gravity.


Why are rockets for deep space travel so huge?

they have to pass some forces in the earths atmosphere They have to overcome the force of gravity, lifting the rocket and all of the fuel to an escape orbit.


Why do we float in rockets?

because there is zero gravity


How gravity affects firework rockets when it is its way up?

gravity pulls down a rocket


What causes rockets come back to earth?

Gravity


How do you beat gravity on Earth?

To overcome gravity, you must reach "Escape Velocity" to overcome gravity and escape a planet's orbit.


How does an astronaut travel up into space?

Astronauts in their spacecraft (such as the Space Shuttle) are lifted into space by huge rockets which accelerate the craft to "escape velocity" (about 25,000 mph). This puts the craft into orbit around the Earth, its forward velocity balancing the continuous pull of gravity. When they are ready to return to Earth, they use rockets to slow down, and gravity pulls them back out of orbit.