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5 answers

I do not know what "little" fuel means. Little compared to what. It is worth noting, however, that you only need enough fuel for the capsule to reach terminal velocity where it excapes the gravitational attraction to the earth. After that, small thrusters can control the flight. That is because of Newton's first law, that an object in motion stays in motion unless affected by an external force.

Bozo

2007-01-10 12:31:41 · answer #1 · answered by bozo 4 · 1 0

The rocket is travelling through a vacuum for much of the time. Vacuum literally means 'emptiness', and it means there's not even air present.
When you push a large ball and it starts to roll, it wants to roll on for as long as possible. That's called inertia. But while it rolls, it has to overcome friction; the air around it and the ground below it exert force on the ball, making it lose speed and eventually stopping.
The rocket doesn't have anything exerting force on it once it has gotten far enough away from the earth, because there's nothing in the vacuum to do that! So, once it has built up the tendency to fly in a certain direction it will keep flying straight ahead until something starts exerting force on it again (the moon's gravity for example).
And because the moon has less gravity, takeoff from there takes much less fuel than takeoff from earth.

2007-01-10 20:30:53 · answer #2 · answered by Anonymous · 0 0

The rocket need most fuel when they take off, after airborne it just need less (compare to when they take off), after they come out from the earth orbit, the gravitation law is support them. (just like the empty valve, use more power, gain more distance). After entering the moon orbit, the moon gravitation pull the rocket towards moon (although the comparison between the moon gravitation and the earth gravitation is 1 : 6)

2007-01-10 20:34:55 · answer #3 · answered by vebriarta 1 · 0 0

You are right, actually. Once the lunar lander had broken free of earth's gravity, its momentum carried it to the moon using almost no fuel at all. However, it took an ENORMOUS amount of fuel to get that little spacecraft free of earth's gravitational pull. The velocity required to put an object into earth orbit is approx. 17,600mph. To go the next step and escape fully (called surprisingly 'escape velocity') is on the order of 24,000mph. It takes a lot of energy to accelerate something to that speed.

Mebbe they shoulda used a Prius???

-Peace

2007-01-10 20:30:41 · answer #4 · answered by Jackie Treehorn 2 · 0 0

They didn't. Haven't you heard? They shot the moon landing in a studio. LOL

2007-01-10 20:23:36 · answer #5 · answered by 1truthseeker 4 · 0 1

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