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Launching spacecraft



Index Key:   ENG010
Author:      j middle school
Subject:     Launching spacecraft.
How do space ships get off the ground?

Response #:  1 of 1
Author:      daniel n koury jr
Gravity pulls on any object near the earth, including you, and a spaceship. 
To get off the ground, you have to push yourself up harder than the earth is
pulling you down.  When you jump in the air, you are pushing against the
ground.  When a bird flies, it is pushing against the air with its wings.  A
spaceship (or rocket) pushes against its exhaust - the stuff that comes out
the back.  Just as if you were sitting on a swing and threw a baseball
forward, you would move backwards.  The harder you throw the baseball, the
more you will move.  In the same way a rocket throws hot gasses out the back
and pushes itself forward.  If it pushes hard enough, it "blasts off".  If
it keeps pushing hard enough, it keeps going higher.

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in another small container called, you guessed it, the absorber. From there this concentrated solution flows back to the generator to complete the cycle. This is the type of refrigerator that is seen most often in campers and RV's.