how fast must you travel to leave the earths atmosphere?
368139
If the object has onboard power, then the speed is not really relevant to whether it will leave the atmosphere, just when. If you just fire an object upwards and it has no self-propulsion, however, then you need to calculate the change in gravitational potential energy (find out how far the atmosphere extends) and add the energy lost to air friction (this depends on velocity). Equate this to the object's initial kinetic energy and solve for initial velocity v. Your initial velocity will have to be larger than this.
605786
When a spacecraft is in orbit it needs no energy. That's the simple answer. However, you need to get it into orbit in the first place, and this means accelerating the object to the speed it needs to orbit the earth - around 18,000 mph. How much energy you need then depends on the mass of the object or spacecraft - this can be calculated from 1/2 mv^2. \n\nTo escape the earths gravity altogether the spacecraft needs to go faster, about 25,000 mph or 7 miles per second. So if you were going to Mars for example, once you achieve that speed you need no more energy.
448267
the average orbital velocity of earth is 29.783 km/s.\n\nhttp://en.wikipedia.org/wiki/Earth
262383
It requires enough thrust to escape Earth's Gravity. \n\nIt is said that a spacecraft uses more than 70% of the fuel on board in the first 20 minutes of the mission just to be able to "enter space", i.e. escape Earth's powerful gravitational pull.
218504
Minimum speed that a spacecraft has is always gerater than the escape velocity i.e. over 11 Km/Sec. This means you can reach to USA under 20 mins or so!
325003
You would have to overcome the spinning motion of the atmosphere.  See my answer to your "if the world stopped spinning" question.  So yes, if you could reach about 900 mph going west, you would be counteracting the spinning of the Earth and eventually be somewhere else "without moving".  Now about the Earth's orbit around the sun...
1018691
about 1000 mph.\n\napprox #'s here--earth is 25,000 miles in circuvfrence, 24 hours per day.   this is at equator.\n\ni am thinking, the farther away from equator, the speed can be progressivly slower.
647859
Neglecting all factors, including air resistance, you would fall faster and faster until you passed the center going really fast, and "fall" up to the surface on the other side of the Earth, slower and slower, until you stopped at the surface on the other side. To someone standing there it would seem as if you had been been thrown up from deep in the hole just hard enough to reach the surface. The time it would take to go through the Earth this way would be the same as the time it would take to complete half an orbit around the world, or about 45 minutes.
1129932
The answer is very simple: the same amount of fuel is required no matter which reference frame you're in. Because it only takes you 5 minutes to travel from point A to point B, your fuel consumption rate will be significantly higher in your reference frame (remember consumption rate = amount of fuel burned/time) than someone measuring the rate in a stationary reference frame. The key points to remember is that total amount of matter and energy is the same no matter what reference frame you're in, but the passage of time is relative, and is dependent on your speed of motion.\n\nSo before you start your trip back to Earth, you must carry enough fuel to burn for 5 minutes, but you'll need to account for the relativistic effect, so you'll find that it is the same amount of fuel you'll need to burn for 100 years, according to someone in the stationary reference frame.\n\nI hope this helps to clarify these concepts for you!
919666
The distance to the sun is 150 million km. So the circumference is 940 million km. The earth takes a year to do it, or 31.6 million seconds. Therefore the average speed is 29.8 km/sec  or 107200 km/hour or 66600 miles/hour.
693642
The orbital velocity of the satellite depends on its altitude above Earth. The nearer Earth, the faster the required orbital velocity. At an altitude of 124 miles (200 kilometers), the required orbital velocity is just over 17,000 mph (about 27,400 kph). To maintain an orbit that is 22,223 miles (35,786 km) above Earth, the satellite must orbit at a speed of about 7,000 mph (11,300 kph). That orbital speed and distance permits the satellite to make one revolution in 24 hours. Since Earth also rotates once in 24 hours, a satellite at 22,223 miles altitude stays in a fixed position relative to a point on Earth's surface. Because the satellite stays right over the same spot all the time, this kind of orbit is called "geostationary." Geostationary orbits are ideal for weather satellites and communications satellites. \n\nIn general, the higher the orbit, the longer the satellite can stay in orbit. At lower altitudes, a satellite runs into traces of Earth's atmosphere, which creates drag. The drag causes the orbit to decay until the satellite falls back into the atmosphere and burns up. At higher altitudes, where the vacuum of space is nearly complete, there is almost no drag and a satellite can stay in orbit for centuries (take the moon as an example). \n\nSatellites usually start out in an orbit that is elliptical. The ground control station controls small onboard rocket motors to provide correction. The goal is to get the orbit as circular as possible. By firing a rocket when the orbit is at the apogee of its orbit (its most distant point from Earth), and applying thrust in the direction of the flight path, the perigee (lowest point from Earth) moves further out. The result is a more circular orbit
785087
We cannot leave our solar system until we figure out how to travel at much higher speeds than we can now.  Even if we could travel at 1/2 of light speed, it would still take 8 years to get to the nearest star.  The crew would have very little to do during the voyage.  And, they'd have to carry supplies for the 16-year round trip.  The ship would be enormous -- certainly larger than anything we have ever built.\n\nUntil we can find a way to travel at speeds faster than light, we will not be able to visit other star systems.
59568
The earth spins at about 1100 miles per hour at the equator (26,000 miles in 24 hrs) so stopping fast would be very distasterous to all living things. Remember, everything not locked down on earth would try to keep going 1100 mph! Imagine the ocean water going 1100 mph & slamming all the coastlines! From a human perspective, it would be very exciting for a second or two, then we'd all be flying with debris all around us that suddenly is going 1100 mph. I'd imagine lots of trees & rocks & bricks & wood & cars & metal, it would not be fun... Eventually we'd land on the ground or hit a mountain or something that stopped along with the earth. We'd then go up to heaven or nirvana or whatever religion place we go when we die. I would think things like seeds, bacteria & bugs would survive - but I'm only guessing given the way all the weather, land & seas would be changed. I doubt gravity would change very much but nobody would be alive to check...
391419
618 km/s (just under 1.4 million mph).  Important to know this figure if you want to move around in the solar system as it scales with your distance from the sun.\n\nYou can find the escape velocity of any object:\nEscape Velocity = SquareRoot((2GM)/r)\nG = Neton's gravitational constant\nM = mass\nr = radius
315964
At the equator, about 1000 mph, at the poles not much.\n\nhttp://curious.astro.cornell.edu/question.php?number=665
343175
the surface of earth moves at a very high speed. (~ 1674 km/h)\n\n(2 * pi * 6400 km)/ 24 hours\n\nBut the atmosphere surrounding the earth also moves with same speed. So it keeps us dragging the person who jumps and make sure he falls "vertically" at the same place.\n\nIf there is no atmosphere around a planet and if you jump there from helicopter, you can feel the difference.\nOn this planet, if you jump from ground, you will move along with planet because of Newton's first law. (similar to throwing a ball up in a travelling car. the ball will travel along with car)
946723
To escape the Earth, you have to go over 7 miles per second.  That's the escape velocity you need to escape the gravitational pull of the Earth.  The gravitational pull of a black hole (inside the event horizon) exceeds the escape velocity of light.  In other words, light would have to move faster than 186,000 miles per second in order to escape.  Since it can't, light can't escape the gravitational pull.  No sucking required.