Planetary Science

Why would escape velocity be different on a different planet?

123

2011-05-11 00:53:34

The escape velocity is determined by the gravity of the planet which in turn is determined by the mass and size of the planet

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Related Questions

Escape velocity is the minimum velocity (or speed) that an object would need to reach to 'escape' the orbit of a planet.

The simple answer is that unless the rocket achieves escape velocity, the planet it hits would be Mars. Due to the rotation of the planets, if it did reach escape velocity, it would depend on the position of the planets and the path into space it took.

Escape velocity is the speed you would have to go to escape gravity.

If aimed appropriately it would escape from the earth (ie not go into orbit around it). That's why the escape velocity is called just that.

Not at all. It would take an infinitely large mass to produce an infinite escape velocity, and no such infinite mass exists. Furthermore, the escape velocity for any object is the same no matter what is trying to escape, so light does not have its own escape velocity. This question presumably concerns black holes. Light does not escape from black holes because the escape velocity is greater than the speed of light. The speed of light is not infinite, it is 300,000 kilometers per second.

Escape the earth's gravitational pull and continue out into space. However, a rocket does not need to be launched at the escape velocity as it can continue to accelerate as it climbs. A gun projectile would need to be fired with the escape velocity. In a perfect system with only the projectile and the Earth: If the projectile is fired with the exact escape velocity it will travel to infinity away from the Earth. Upon reaching infinitely far away from Earth the projectile would have zero velocity. All of its kinetic energy (movement) would be transferred to potential energy.

Yes, it would. That's one reason why some artificial satellites were tossed into orbit after being carried up aboard the space shuttle. The reason is because escape velocity from Earth depends on Earth's gravity, which in turn depends on the distance from the Earth's center. The higher you go, the farther you are from the center of the planet, the less gravitational force there is between you and the Earth, and the smaller the escape velocity thus becomes.

Atmospheric pressure is an important factor in keeping liquid water on the surface of a planet. With no atmosphere, liquid water would quickly escape into space. It would depend on various factors such as the temperature and escape velocity of the planet of course. Scientists think liquid water existed on Mars in the past when the atmosphere was a lot denser. Water does exist on the surface Mars, but only as ice.

If it is close to Earth, it would need a speed of 11.2 kilometers per second to escape from Earth.

In our solar system, Jupiter has the highest escape velocity at around 60 km/s due to is great mass, compared to Earth which is about 11 km/s. Note that it would actually be harder to escape the solar system from Mercury because of its proximity to the mass of the Sun.

They don't. "Escape velocity" is a misnomer, an error born out of trying to do the math about a rocket as if it were an artillery shell. "Escape velocity" for the Earth is about 25,000 miles per hour, or 7 miles per second. If you were to fire a shell from a cannon, it would need to exit the cannon at the "escape velocity" to escape Earth's gravity and continue into space. But rockets aren't cannon shells, and with enough fuel can continue into space at whatever velocity you want. Achieving orbit is a different calculation. In order to get into orbit, a rocket must accelerate to its desired orbital velocity for that altitude.

The ball is the planet in orbit, the person twirling it is like the sun. the string is the gravitational pull between the two, while the orbital velocity of the ball tries to escape (if you let the ball go it would fly away).

"Escape velocity" is a misnomer; there isn't any such thing. "Escape velocity" is the speed that it would take a projectile to escape completely from the Earth's gravity, IF IT WERE FIRED FROM THE SURFACE FROM A CANNON.The "escape velocity" from Earth is about 7 miles per second, or 25,000 miles per hour. But the Apollo spacecraft that went to the Moon didn't go anywhere near that speed. It didn't have to, because it was propelled by a rocket engine. With a big enough engine and enough fuel, you could "escape" from the Earth at 5 miles per hour, or less. It would be TERRIBLY wasteful of fuel, which is why we don't do it that way.

velocity is speed with a direction. speed would be like 35mph. velocity would be like 35 mph south

The word "black" aptly describes the inability of light to escape - all light and matter that passes the event horizon can only do so in one direction, falling in. The reason is, the escape velocity inside the event horizon is greater than the speed of light, the event horizon itself being the boundary at which the escape velocity is equal to that speed. Outside that horizon, the escape velocity is less than the speed of light, hence it would be possible for light and objects moving at speeds approaching that of light to escape.

That would be the escape velocity of Earth, about 11.2 km/sec. I am assuming that the object falls from far, far away, and that air resistance is negligible.That would be the escape velocity of Earth, about 11.2 km/sec. I am assuming that the object falls from far, far away, and that air resistance is negligible.That would be the escape velocity of Earth, about 11.2 km/sec. I am assuming that the object falls from far, far away, and that air resistance is negligible.That would be the escape velocity of Earth, about 11.2 km/sec. I am assuming that the object falls from far, far away, and that air resistance is negligible.

The speed that ab object must travel at to escape a planet's gravity is called escape velocity. This value varies depending on the mass and diameter of the planet. Here are the escape volcities of the eight planets of our solar system. Mercury: 9,400 mph Venus: 23,000 mph Earth: 25,000 mph Mars: 11,000 mph Jupiter: 133,000 mph Saturn: 77,000 mph Uranus: 48,000 mph Neptune: 53,000 mph Note that escape velocity only takes gravity into account and ignores other forces. An object launched from Earth's surface or from any other planet with a substantial atmosphere at escape velocity would be quickly destroyed and slowed down by air resistance.

Then it will escape Earth's gravitational field, and go farther and farther away.

Not as water. But water is made of hydrogen and oxygen, so... The mass of hydrogen gas is low enough that the kinetic theory of gases describes an average velocity close to the escape velocity from Earth. At upper atmosphere temperatures, there is insufficient thermal energy to boost significant amounts of anything except hydrogen to escape velocity. Losing hydrogen will decrease the amount of water, so this would be a down side of making lots of hydrogen for powering cars (and such). "Spills" would / could reduce the amount of hydrogen on Earth.

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.

A greenhouse effect traps heat that would otherwise escape out to space, so it keeps the planet warm.

As the moons gravity is comparatively weak the escape velocity from the moon is much lower. The speed of the gasses would exceed this velocity and therefore escape to space. There are of course other factors that effect these matters.

An object would need to start at about 25 miles per second in order to escape Earth's gravity.

The force of planetary attraction toward the sun would increase, the planet velocity would increase and the planets would be become smaller from the gravitational compressive force on each planet.

PhysicsDwarf Planet PlutoBotany or Plant BiologyScienceAstronomySpace Travel and ExplorationAstrophysicsPlanetary ScienceJobs & EducationBlack HolesGravityAtmospheric SciencesThe MoonGlobal WarmingHarvard University

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