Multiply by 1000
8 kph is a steady jogging pace.
1,400,000 meters is the same as 1400km
9000
The moon has enough speed to orbit the earth. Two forces, gravity and centrifugal force keeps the moon in orbit. The moon will not orbit the earth forever. Scientific Estimations estimate the moon slipping away from the earth at about a rate of 4 cm every year. No, not meters, not kilometers.
A low Earth orbit is an orbit still in the outermost part of Earth's atmosphere. This kind of orbit occurs a few hundred kilometers into the atmosphere.
Mainly, it has to: (1) Move at a sufficiently high speed. Near the Earth's surface, that would be about 7.9 kilometers per second (7900 meters per second). You can multiply the meters per second by 3.6 if you prefer it in kilometers/hour. (2) Be sufficiently far from Earth, to avoid air resistance. A height somewhere between 100 and 200 kilometers is required, for a relatively stable orbit. Comment: I think "in a circular orbit" is what the question is looking for as the answer.
Earth
earth
The eight planets, including Earth, have their own orbits.
The Earth takes one year to orbit the Sun at an average distance of 150 million kilometers (93 million miles). The distance 150 million kilometers is used as a measure called an Astronomical Unit or AU.
It doesn't. The Earth's orbit is elliptical. The aphelion (where it is farthest from the sun) is around 152 million kilometers, the perihelion (closest to the sun) is ca. 147 million kilometers. What keeps it in that orbit is gravity and Newton's laws of motion.
Hubble's orbit is 366 miles (589 kilometers) above Earth
orbit =)