2006-11-13 13:07:22 · 4 answers · asked by eastarcher 1 in Science & Mathematics ➔ Astronomy & Space
Plane upwards force > then Earth gravitational pull + mass of the plane+how fare it want to be escape.
2006-11-13 13:12:25 · answer #1 · answered by M.R.Palaniappa 2 · 0⤊ 1⤋
If by some miracle an airplane could continue flying in the vacuum of space then only normal velocity would suffice. Think of it this way. The "escape velocity" of the earth's gravity (about 25,000 mph) applies only to a vehicle which has no more thrust. It is like you are trying to climb a hill on a bicycle by going real fast on the flat ground below it and letting your momentum carry you over the top. In order to get to the top of the hill without pedalling any more you have to exceed a certain velocity at a certain point on the flat below the hill. Similarly, a rocket (because it cannot burn fuel and thrust forever) must reach a certain velocity to get away from the gravity of the earth. If it could thrust forever then only a few dozen or less miles per hour would work. If there were a ladder all the way to the moon you could climb it easily (given air and food in sufficient quantities, of course).
2006-11-13 22:55:05 · answer #2 · answered by David A 5 · 2⤊ 0⤋
Escape velocity is 17,500 miles per hour.
2006-11-13 21:16:27 · answer #3 · answered by donna_the_woman 2 · 0⤊ 2⤋
see:http://en.wikipedia.org/wiki/Earth
11.186 km/s = 25,000 mph
2006-11-13 21:36:12 · answer #4 · answered by arbiter007 6 · 3⤊ 0⤋