what must be the speed of a rocket to leave earth?

Answer 1

Newton's second law of motion is especiaily useful when designing efficient rockets. To enable a rocket to climb into low Earth orbit, it is necessary to achieve a speed, in excess of 28,000 km per hour. A speed of over 40,250 km per hour, called escape velocity, enables a rocket to leave Earth and travel out into deep space. Attaining space flight speeds requires the rocket engine to achieve the greatest action force possible in the shortest time. In other words, the engine must burn a large mass of fuel and push the resulting gas out of the engine as rapidly as possible.

Answer 2

In round numbers, about 25,000 MPH or 11 kilometers per second. It is called escape velocity. An object thrown up at that speed and then allowed to coast with no more thrust applied will go higher and higher, and slower and slower until, in theory, it reaches zero speed at infinite distance.

Answer 3

When the speed of the rocket more and strength than the gravity's force that react to the rocket mass.

Answer 4

the speed of the space shuttle to leave the atmosphere is about 175,00 mph this is why the space station orbits the earth every 92 minutes, it is going 17,500 mph, any slower and we'd fall back to earth's surface

Answer 5

About 7 km/s but depends on the orbit you want to reach.

mass doesn't affect orbit speed!!! but of course to accelerate 1 ton you need more force than 1kg (or the same force more time)

Answer 6

I don't think there is a minimum speed. It's about the force of the rocket compared to its mass.

Answer 7

http://en.wikipedia.org/wiki/Earth

Up to 11.186 km/hr, which is for total escape. To get into orbit requires less velocity